The Kynix Components

Product OverviewThe LM3900 series consists of four independent, dual input, internally compensated amplifiers which were designed specifically to operate off of a single power supply voltage and to provide a large output voltage swing. These amplifiers make use of a current mirror to achieve the non-inverting input function. Application areas include ac amplifiers,  RC  active filters, low-frequency triangle, square wave, and pulse waveform generation circuits, tachometers, and low speed, high voltage digital logic gates. This blog will introduce LM3900 systematically from its features, pinout to its specifications, applications, also including LM3900 datasheet and so much more. Synthchaser #107 - Homemade LM3900 Norton Op Amp Tester CatalogProduct OverviewLM3900 FeaturesLM3900 PinoutLM3900 Pin ConfigurationLM3900 ApplicationsLM3900 Circuit DiagramLM3900 Schematic and Connection DiagramsHow the 4-channel Audio Mixer WorksSpecification of LM3900 VS LM2900LM3900 DatasheetLM3900 ManufacturerUsing WarningsLM3900 FAQ LM3900 FeaturesWide single supply voltage  4 VDC to 32 VDCRange or dual supplies g2 VDC to g16 VDCSupply current drain independent of supply voltage  Low input biasing current 30 nAHigh open-loop gain  70 dBWide bandwidth 2.5 MHz (unity gain)Large output voltage swing (Va b 1) Vp-pInternally frequency compensated for unity gain  Output short-circuit protection LM3900 PinoutThe following figure is the diagram of the LM3900 pinout. LM3900 Pinout LM3900 Pin ConfigurationPin NoPin NameDescription1NON-INV-IN 1Non-Inverting Input 12NON-INV-IN 2Non-Inverting Input 23INV-IN 2Inverting Input 24OUT 2Output Pin 25OUT 1Output Pin 16INV-IN 1Inverting Input 17GNDGround Pin8INV-IN 3Inverting Input 39OUT 3Output Pin 310OUT 4Output Pin 411INV-IN 4Inverting Input 412NON-INV-IN 4Non-Inverting Input 413NON-INV-IN 3Non-Inverting Input 314V+Positive Supply Voltage LM3900 ApplicationsAC amplifiersRC active filtersLow-frequency triangleSquare wavePulse waveform generation circuitsTachometersLow speedHigh voltageDigital logic gates LM3900 Circuit DiagramFollowing is the circuit diagram of LM3900. LM3900 Circuit Diagram  LM3900 Schematic and Connection DiagramsThe architecture and pin configuration of LM3900 is shown in the picture below. LM3900 Schematic and Connection Diagrams How the 4-channel Audio Mixer WorksThe amplification (gain) of each channel is controlled with 1 potentiometer. Four channels means that we will use 4 potentiometers (P1, P2, P3, P4), placed at the inverting input of each amplifier. Each potentiometer controls the audio level of each channel before amplifying the signal and performing the audio mix. The potentiometers are used to control the volume of the input signals. The outputs of the 4 channels are mixed after passing through 4 resistors of the same value (R11, R12, R13, R14) All operational amplifiers are configured as inverting amplifiers and have decoupling capacitors at their inputs and outputs. These capacitors filter (block) the direct current component of the signals at the input and output, amplifying only the alternating signal (the audio signal). Specification of LM3900 VS LM2900keyLM3900LM2900Number of Channels (#)44Total Supply Voltage (Min) (+5V=5, +/-5V=10)4.54.5Total Supply Voltage (Max) (+5V=5, +/-5V=10)3232GBW (Typ) (MHz)2.52.5Slew Rate (Typ) (V/us)2020Rail-to-RailNoNoIq per channel (Typ) (mA)1.551.3RatingCatalogCatalogOperating Temperature Range (C)0 to 70-40 to 85Package GroupSOIC PDIPPDIP SOICApprox. Price (US$)0.08 | 1ku0.09 | 1kuPackage Size: mm2:W x L (PKG)See datasheet (PDIP)See datasheet (PDIP)Additional FeaturesN/AN/AInput Bias Current (Max) (pA)200000200000Output Current (Typ) (mA)105ArchitectureBipolarBipolar LM3900 DatasheetYou can download this datasheet for LM3900 Quad Amplifier – Datasheet from the link given below: LM3900 Datasheet LM3900 ManufacturerTexas Instruments Incorporated (TI) is a global semiconductor design and manufacturing company that develops analog ICs and embedded processors. By employing the world's brightest minds, TI creates innovations that shape the future of technology. TI is helping more than 100,000 customers transform the future, today. Using WarningsNote: Please check their parameters and pin configuration before replacing them in your circuit. LM3900 FAQ① What are the cool things about the LM3900?One of the cool things about the LM3900 is that the input voltage can exceed the supply rails without a lot of fancy stuff. Thus you could look for the presence of line to speaker levels very easily and even filter the hiss. That's what a specific timer of mine does. ② How many channels does a lm3900 audio mixer have?The circuit has two channels for microphone inputs and two channels for inputs of other devices. If you want a mixer with more input channels, you can duplicate this circuit and get a mixer with up to 8 channels. The LM3900 operational amplifiers have the following characteristics: High amplitude output voltage. ③ Can a lm3900 op amp be replaced?The LM3900 was a very different kind of op amp. It operates on the difference in input current rather than the difference in input voltages. It can not be replaced with a LM324 op amp. From what I read, the NTE992 is a replacement. ④ What do LM3900 amplifiers use to achieve the non-inverting input function?Current mirror ⑤ What type of filter is used in the LM3900 series?RC active filters

8-Bit I2C  I/O  Expander with Serial Interface  MCP23008 provides an 8-bit parallel input/output expansion for I2C bus and SPI applications. This microcontroller has 8-bit configuration registers for input, output, and polarity changing.CatalogDescriptionCAD ModelPinoutPinout DiagramProduct AttributesProduct FeaturesPackagesHow to wire an MCP23008 I2C interface with an Arduino?ComponentsDetails ExplainedMCP23008 DatasheetFAQ DescriptionAdd another 8 pins to your microcontroller using an MCP23008  port expander. The MCP23008 uses two i2c pins  (these can be shared with other i2c devices), and in exchange gives you 8 general purpose pins. You can set each of 8 pins to be input, output, or input with a pullup. There's even the ability to get an interrupt via an external pin when any of the inputs change so you don't have to keep polling the chip.Use this chip from 2.7-5.5V (good for any 3.3V or 5V setup), and you can sink/source up to 20mA from any of the  I/O pins so this will work for LEDs and such. Team it up with a high-power MOSFET  if you need more juice. DIP package means it will plug into any breadboard or perfboard.You can set the i2c address by tying the ADDR0-2 pins to power or ground, for up to 8 unique addresses. That means 8 chips can share a single i2c bus - that's 64 I/O pins! MCP23008   CAD Modelsymbol and footprintPinout There is the main 18 pinout of MCP23008, which are described below with a detailed description. MCP23008 Pinout  Pinout DiagramPin#Type  ParametersPin#1SCL/SCKIt is a Serial clock input.Pin#2SDA/SIIt is a Serial data I/O (MCP23008)/Serial data input (MCP23S08) pin.Pin#3A2/SOIt is a hardware address input (MCP23008)/Serial data output (MCP23S08). It (A2) must be biased externally.Pin#4A1It is a Hardware address input. It Must be biased externally.Pin#5A0It is a Hardware address input. It Must be biased externally.Pin#6RESETThis is an external reset input.Pin#7NC/CSNo connect (MCP23008)/External chip select input (MCP23S08).Pin#8INTIt is an Interrupt output. It Can be configured for active-high, active-low or open-drain.Pin#9VSSIt is used for Ground.Pin#10GP0It is a Bidirectional I/O pin. It can be enabled for interrupt-on-change and/or internal weak pull-up resistor.Pin#11GP1It is a Bidirectional I/O pin. It can be enabled for interrupt-on-change and/or internal weak pull-up resistor.Pin#12GP2It is a Bidirectional I/O pin. It can be enabled for interrupt-on-change and/or internal weak pull-up resistor.Pin#13GP3It is a Bidirectional I/O pin. It can be enabled for interrupt-on-change and/or internal weak pull-up resistor.Pin#14GP4It is a Bidirectional I/O pin. It can be enabled for interrupt-on-change and/or internal weak pull-up resistor.Pin#15GP5It is a Bidirectional I/O pin. It can be enabled for interrupt-on-change and/or internal weak pull-up resistor.Pin#16GP6It is a Bidirectional I/O pin. It can be enabled for interrupt-on-change and/or internal weak pull-up resistor.Pin#17GP7It is a Bidirectional I/O pin. It can be enabled for interrupt-on-change and/or internal weak pull-up resistor.Pin#18VDDPower pin.Pin#19N/CN/C Product AttributesTYPEDESCRIPTIONCategoryIntegrated Circuits (ICs) Interface - I/O ExpandersMfrMicrochip TechnologySeries-PackageTubePart StatusActiveNumber of I/O8InterfaceI虏CInterrupt OutputYesFeaturesPOROutput TypePush-PullCurrent - Output Source/Sink25mAClock Frequency1.7 MHzVoltage - Supply1.8V ~ 5.5VOperating Temperature-40C ~ 125C Mounting TypeThrough HolePackage / Case18-DIP (0.300", 7.62mm)Supplier Device Package18-PDIPBase Product NumberMCP23008Report an Error View Similar  Product Features8-bit port expander with interrupt output3 address inputs for up to 8 devices on one bus25mA sink/source capability per I/OSupports 100kHz, 400kHz, and 1.7MHz I2C  ™Compatible modesInternal power-on-reset (POR) Packages18-pin  PDIP  (300 mil)18-pin SOIC (300 mil)20-pin SSOP20-pin QFN  MCP23008 Package type  How to wire an MCP23008 I2C interface with an Arduino?We will demonstrate how to connect an MCP23008  I/O port expander chip to an Arduino microcontroller in this project. If we need more I/O ports for a microcontroller, this is a very useful thing to do.Input/output ports are referred to as I/O ports. If we need more inputs or outputs to a microcontroller, we can use an I/O port expander chip to increase the number of I/O ports.The MCP23008  chip will provide us with an additional 8 I/O ports by utilizing only two pins on the microcontroller.The I2C  bus and protocol are used by the MCP23008  chip. As a result, only two digital pins on the Arduino are required. As a result, it uses a very small number of I/O pins for communication.It uses two pins for the clock line and one for the data line.The I/O ports are all bidirectional. As a result, the device connected to one of the ports can both receive and send data to the microcontroller. Each port can sink up to 25mA of current, which is sufficient to power devices such as the LEDs used in this circuit. If you need more current, you can always use a transistor, but for this circuit, the IC can drive LEDs.We can drive 8 LEDs with an  MCP23008  because it has 8 outputs. ComponentsMCP23008 I/O Port ExpanderA few 220Ω resistorsA few LEDsArduino microcontroller   It is an ideal addition to a microcontroller that requires more I/O ports. The  MCP23008 I/O port expander costs slightly more than $2. It is a chip with 18 pins.18 pins The MCP23008 is powered by +5V. As a result, we can connect  VDD  to the Arduino's 5V terminal. VSS is connected to the ground. This completes the powering requirements for the MCP23008,  The 8 I/O ports are labeled GP0-GP7. Because NC is not connected, we leave that pin unconnected (or floating). SCL stands for serial clock line. It connects to the analog clock pin on the Arduino.  analog pin 5. The serial data line is abbreviated as SDA. It connects to the analog data line on the Arduino's analog pin 4. The interrupt pin for the outputs is  INT. We leave this pin unconnected because we are not going to use interrupts here. The address pins are A0, A1, and A2. If you're using multiple MCP23008 chips, you only need to be concerned about these pins. These pins are externally biased, which means you can supply voltages to them to generate different addresses. Because there are three pins, you can generate a total of eight different addresses (23=8). This is only required if you are connecting multiple ICs so that we can tell them apart. MCP23008 I/O Port Expander Circuit with an Arduino  Microcontroller. The MCP23008 I/O port expander circuit we will build with an Arduino microcontroller is shown below.  MCP23008 Arduino Circuit Details ExplainedLet us now go over our projects in detail. In this circuit, we connect a 220 resistor and an LED to each input and output pin. We connected +5V to Vdd and Vss to  GND  for input power.Now, connect SCL pin 1 of the MCP23008 to analog pin 5 of the Arduino,  This synchronizes the clocks of the  Arduino and the I/O port expander chip.Following that, we connected to pin 2 of the MCP23008.  which is SDA, to analog pin 4 of the  Arduino,  Data can be transferred between the  Arduino and the I/O port expander chip via this connection. Because interrupts aren't used in this project, leave the  INT pin unconnected. We don't use the RESET pin; instead, we connect it to +5V. To use it, simply connect it to a digital pin on the Arduino,  If you want to reset all outputs, connect this pin to the ground in cade.Following that, we'll connect address pins A0, A1, and A2 to the ground. It changes the address of these three pins to 000. This is MCP23008 Arduino Interfacing. MCP23008 DatasheetMCP23008 Datasheet  FAQWhat is MCP23008?MCP23008 – I2C interface; three address pins. • MCP23S08 – SPI interface; two address pins. The MCP23X08 consists of multiple 8-bit configuration registers for input, output and polarity selection. The system master can enable the I/Os as either inputs or outputs by writing the I/O configuration bits. What are I O expanders?NXP's general-purpose input/output (GPIO) expanders are a simple, cost-effective way to monitor and control several peripheral signals. They make it easy for designers to add extra I/O to their design and thereby free up the microprocessor's GPIO for other, more important functions. What is I2C port?I2C is a packet-switched serial communication protocol that allows multiple master devices to connect to multiple slave devices using only 2 wires per connection. It is intended for attaching lower-speed peripheral ICs to processors and microcontrollers in short-distance, intra-board communication. What does MCP23008 have for input?8-bit configuration registers What does the MCP23008 port expander use?MOSFET

The high-performance, low-power Microchip  8-bit AVR® RISC-based microcontroller combines 16 KB ISP  flash memory with read-while-write capabilities, 512B EEPROM, 512B SRAM, 22 general-purpose I/O lines, 32 general purpose working registers, two flexible timer/counters with compare modes and PWM, USART, programmable watchdog timer with internal oscillator, SPI  serial port,  debugWIRE interface for on-chip debugging and programming, and five software selectable power saving modes. The device operates between 2.7-5.5 volts. CatalogWhat is ATMEGA16U2-MU？ATMEGA16U2-MU PinoutATmega16U2 Pin ConfigurationCAD ModelBlock Diagram ATmega16U2 FeaturesProduct AttributesATMEGA16U2 Subsystem Piece by PieceEquivalent and Alternatives ApplicationsATMEGA16U2 DatasheetFAQ What is ATMEGA16U2-MU？ATMEGA16U2-MU is a CMOS 8-bit microcontroller based on 16KB of ISP  flash program memory and USB controller including 22 I/O ports. 16MHz reference frequency is used to operate the AVR core processor. By allowing the system designer to provide optimization to processing speed and power consumption, the ATmega16U2  achieves throughputs approaching 1 MIPS per MHz by implementing powerful instructions in a single clock cycle.ATMEGA16U2-MU is designed and manufactured with Atmel’s nonvolatile high-density memory technology. The ISP  flash in chip let the program to be reprogrammed in-system by using SPI  serial interface. the Atmel ATmega16U2  is a well built powerful microcontroller that offers a highly flexible and cost-effective solution to many embedded control applications by merging In-System Self-Programmable Flash with 8-bit RISC CPU on a monolithic chip.The ATmega16U2  is supported with a full suite of program and system development tools including in-circuit emulators, C compilers, evaluation kits, macro assemblers,  and program debugger/simulators.  ATmega16U2  ATMEGA16U2-MU Pinout ATmega16U2 Pinout   ATmega16U2 Pin Configuration PIN NamePIN DescriptionVCCDigital supply voltageGNDGroundAVCCSupply Voltage Input Pin for all analogue featuresPORT B8-bit bi-directional I/O port with internal pull-up resistorsPORT C8-bit bi-directional I/O port with internal pull-up resistorsPORT DServes as analogue inputs to the analogue comparator and as an 8-bit bi-directional I/O portD-Negative Full Speed USB Data Upstream PortD+Positive Full Speed USB Data Upstream PortUGNDUSB GroundUVCCUSB Pads Internal Regulator Input supply voltageUCAPUSB Pads Internal Regulator Output supply voltageRESET/PC1/dWReset InputXTAL1Input to the internal clock operating circuit and Input to the inverting Oscillator amplifier.XTAL2/PC0The output from the inverting Oscillator amplifier if enabled by Fuse. Also used as a generic I/O  CAD Model Symbol  Footprint Block Diagram  Block Diagram   ATmega16U2 FeaturesLow power AVR 8-bit microcontroller with high performanceNon-volatile data memories and programIn-system self-programmable flash of 16KBEEPROM of 512Internal SROM of 51210,000 Flash/ 100,000 EEPROM write/erase cycles20 years at 85°C/ 100 years at 25°C data retentionOptional Boot Code Section with Independent Lock BitsSoftware security programming lockFull Speed 2.0 USB device moduleComplies fully with Universal Serial Bus Specification REV 2.0Endpoint 0 for Control Transfers: from 8 up to 64-bytesComplies fully with Universal Serial Bus Specification REV 2.0Fully independent 176 bytes USB DPRAM for endpoint memory allocationSuspend/Resume InterruptsMicrocontroller reset on USB Bus Reset without detachingUSB Bus Disconnection on Microcontroller RequestOn-Chip Debug Interface (debugWIRE)22 Programmable I/O LinesFive Sleep Modes: Idle, Power-save, Power-down, Standby, and Extended StandbyInternal Calibrated OscillatorPower-On Reset and Programmable Brown-out DetectionOperates at 2.7 to 5.5 voltagesOperate at -40°C to +85°C temperatureThe maximum frequency of 8MHz at 2.7V and 16MHz at 4.5V – Industrial Range  Product Attributes TYPEDESCRIPTIONCategoryIntegrated Circuits (ICs) Embedded - MicrocontrollersMfrMicrochip TechnologySeriesAVR ATmegaPackageTape & Reel (TR) Cut Tape (CT) Digi-ReelPart StatusActiveCore ProcessorAVRCore Size8-BitSpeed16MHzConnectivitySPI, UART/USART, USBPeripheralsBrown-out Detect/Reset, POR, PWM, WDTNumber of I/O22Program Memory Size16KB (8K x 16)Program Memory TypeFLASHEEPROM Size512 x 8RAM Size512 x 8Voltage - Supply (Vcc/Vdd)2.7V ~ 5.5VData Converters-Oscillator TypeInternalOperating Temperature-40C ~ 85CMounting TypeSurface MountPackage / Case32-TQFPSupplier Device Package32-TQFP (7x7)Base Product NumberATMEGA16  ATMEGA16U2 Subsystem Piece by Piece ATMEGA16U2 Subsystem Piece by Piece   Equivalent and Alternatives ATMEGA16U2-MUR, ATMEGA16U2-AU,  ATMEGA16U2-AUR;  ApplicationsThere are many applications of ATMEGA16U2-MU  in embedded design, development, and control systems such asconsumer electronicsappliancesmonitoring medical equipmentcircuitry to control processes.motor controlrectificationpower regulationDAC applications.ATMEGA16U2 microcontroller is used to create a bridge between the port of the main processor and the USB port of the computer on the Arduino board.  ATMEGA16U2 DatasheetATMEGA16U2 Datasheet FAQWhat is ATmega16U2?The ATmega16U2 chip on your Arduino board acts as a bridge between the computer's USB port and the main processor's serial port. What is the difference between Arduino and ATmega328?Difference Between Arduino and ATmega2560 AVRIt differs from the ATmega328 in that it is only available in a surface mount package, so can't be inserted into and removed from a socket on the Arduino. It also has more memory, more pins and more built-in hardware peripherals than the ATmega328. What is the package size of ATMEGA328P?Atmel ATMEGA328P-PU, 8bit AVR Microcontroller, ATmega, 20MHz, 1 kB, 32 kB Flash, 28-Pin PDIP. What is the difference between ATMega328P and ATMega328P Pu?The main difference is the bit before the - . That is, the 328 vs the 328P. The "P" there denotes "Picopower" which allows the chip to run at very low power consumptions. Basically the P version is a more modern version of the non-P chip. How many volts does the Microchip 8-bit AVR® RISC-based microcontroller operate?Between 2.7-5.5 volts What does the Microchip 8-bit AVR® RISC-based microcontroller combine?512B EEPROM What does ATMEGA16U2-MU use?SPI serial interface

2N5401 is a PNP transistor.This device has a thermal shutdown and current limit, making it very durable. In most applications, external components are not required. In addition, 2N5401 is also suitable for card voltage regulation or other applications requiring mid-current negative voltage regulation,  Here, our blog provides you with a basic overview of the 2N5401 Transistor, including its pin descriptions, functions applications, similar products, etc., to help you quickly understand what 2N5401 is.We will be glad to find that this blog can be useful for people loving electronic components ;)Want to learn more about 2N series transistor? - 3 Best 2N series transistors Catalog2N5401 Transistor Pinout2N5401 Transistor Features2N5401 Transistor Similarities2N5401 Transistor OverviewHow to Use 2N5401 Transistor?2N5401 Transistor Applications2N5401 Transistor PackageComponent DatasheetFAQ2N5401 Transistor Pinout2N5401 has three pins, which are the same as any other transistor, namely the Emitter, Base, and Collector.Pin NO.PinNameFunction1EmitterCurrent flows through this pin to the device2BaseBase is used to activate the ON and OFF transistor3CollectorCurrent flow out of this pin2N5401 Transistor FeaturesAvailable in Pb−Free packageHigh collector breakdown voltage  With DC Current Gain (hFE) up to 100Maximum voltage across collector and emitter: 150VMaximum current allowed trough collector: 600mAMaximum voltage across collector and base: 160 VMaximum voltage across base and emitter: 5VOperating temperature range: -55ºC to +150ºCMaximum power dissipation: 0.62 W2N5401 Transistor SimilaritiesMPSA93, BF723, 2N5096, 2N5551 (NPN), MPSA922N5401 Transistor Overview2N5401 is specifically designed for use in high voltage applications where loads consume much less power (i.e. Current drawn by the load is low). These types of circuits can be seen in the telephone system. It can also be used if you want a simple switching device for high voltage loads. The component is also cheap and easy to work with.How to Use 2N5401 Transistor?2N5401 can be used as any general-purpose PNP  transistor, but for the sake of understanding the working device, let us consider the simple application circuit as shown below. In the above circuit, we use 2N5401 as a simple switching device and the switching load is a small DC motor. The button here is to provide the transistor with the trigger and the 10K over resistor is to limit the current to the base and to avoid breach of the maximum voltage allowed at the base. The circuit is powered from a negative-5V DC voltage source as shown in the diagram.Before starting work, let us revise the typical characteristics of the PNP  transistor:The device does not operate when the current does not flow out of the base of the transistor or the device only operates when the base current that flows out of the device reaches the threshold.The current flow through the collector is determined by the base current at a certain point. So the higher the gate current, the lower the conduction resistance and the higher the collector current.The PNP  transistor only operates when the threshold current flows out of the base so that the instant the base current reaches zero the device stops runningConsider that the button is not pressed: if the button is not pressed, there will be no base current and the transistor will not operate on the basis of the characteristics of the PNP  transistor. If the transistor does not conduct the entire voltage, it will appear and the engine will be off.Consider the button being pressed: when the button is pressed, the base of 2N5401 will be connected to the negative power supply and there will be a path for the current flow. When the base current flows out of the device, it will start to run as indicated in the characteristics. In the presence of this collector current, a voltage appears across the engine connected in series to the collector pin. In the presence of the voltage, the engine will start to rotate and stay the same until the button is released. As soon as the button is released, the base current will reach zero, by turning off the transistor and the engine.In this way, we can turn the engine on and off by using a simple button as a trigger and the 2N5401 as a switching device. When switching high-speed, the trigger is provided by a microcontroller instead of a button.2N5401 Transistor ApplicationsGeneral purpose of switching and amplificationTelephone applicationsHigh-voltage application2N5401 Transistor PackageThat’s all for our introduction to 2N5401. If you find this blog useful, please bookmark our website Apogeeweb, we will provide you with electronic component blogs, industry news, tools, etc. that you are interested in. Stay tuned for our next blog...Component Datasheet2N5401 DatasheetFAQWhat is 2N5401?PNP transistor What is 2N5401 suitable for?Card voltage regulation What can 2N5401 be used if you want for high voltage loads?A simple switching device What is the switching load of 2N5401?DC motor

I DescriptionAs we all know, low-power regulated power supplies are widely used electronic equipment in electronic system testing. However, this low-power power supply still has some inconvenience to use. For example, most of these power supplies have fixed voltage output or adjustable voltage, but there is no intuitive digital display.Therefore, in response to the need for continuous adjustment of the power supply voltage and digital display function, this blog has designed an adjustable digital display low-power regulated power supply based on LM317:The design and debugging of regulated power supply can be realized;The output voltage can be adjusted continuously from 1.25V to 15V;The output current can reach 1.25A;The voltage adjustment accuracy can reach 0.25 level.In summary, the LM317 regulated power supply has the characteristics of high output accuracy, easy adjustment, and intuitive display.How to Configure the LM317 Voltage Regulator?CatalogI DescriptionII IntroductionIII Principle of Adjustable Digital Display DC Power SupplyIV Circuit Design and Parameter4.1 Selection of Power Transformer4.2 Rectifier Filter Circuit4.3 Output Adjustable Voltage Regulator Circuit4.4 ADC Voltage Detection and Display CircuitV Power Debugging and Testing5.1 Power Debugging Issues5.2 Test and AnalysisVI ConclusionComponent DatasheetFAQOrdering & QuantityII IntroductionThe low output power  DC power supply is the necessary electronic equipment for using, testing, and overhauling electronic products. It can ensure the supply of high-power electrical appliances when the load changes or the power grid fluctuates. This is reflected in two aspects: smooth working voltage output and sufficient load current drive capacity.At present, the common low-power stabilized power supplies generally have a fixed voltage output or although the voltage is adjustable, there is no intuitive digital display, which brings inconvenience to users. Therefore, the use of low-cost stabilized chips and digital display modules to design and manufacture miniaturized low-power DC stabilized power supplies with adjustable output and digital display functions has universal application significance and use value for electronic system debugging and laboratory testing.The low-power linear DC regulated power supply includes units such as voltage transformation, rectification, filtering, and voltage stabilization. In order to increase the output current, a current expansion circuit is often used in the design. At present, the design and manufacturing technology of DC stabilized power supply is relatively mature. Therefore, the power supply design mainly considers the following practical application requirements:Miniaturization;High precision;Adjustable;Digital display;...This blog has designed an output adjustable low-power DC regulated power supply based on LM317 and ADC. This power supply:It can achieve 1.25～15V regulated output and adjustment;The maximum output current can reach 1.25A;With digital display function  ;It can visually display the real-time output voltage parameters of the power supply;The power supply voltage regulation coefficient is less than 0.01;The display accuracy reaches 0.25 level standard.III Principle of Adjustable Digital Display DC Power SupplyThe low-power stabilized power supply realizes the conversion of the mains into a stabilized DC output and provides a stable voltage and sufficient load current for the load. In addition, the output voltage can be adjusted continuously, with a digital display of the output voltage. The composition of the regulated power supply circuit  is as follows:Power TransformersRectifier circuitFilter circuitLM317 voltage regulator circuitADC voltage detectionDisplay circuit...Figure 1. Principle of  Digital Display Adjustable Regulated Power SupplyIn each part of the unit circuit of the DC stabilized power supply, the power transformer reduces the input power to a suitable AC voltage through the power isolation transformer. For multi-channel power output, you can consider using a dual-winding multi-winding output transformer. The power of the power transformer is based on the design output power of the DC power supply.The rectifier circuit adopts a bridge rectifier module and a rectifier tube to form a full-wave rectifier circuit, which rectifies the alternating current after voltage transformation into direct current with pulsating components. The inverted LC filter is used in the filter circuit to filter out the pulsating AC component, eliminate the ripple, and output a smooth DC voltage.The voltage stabilizing and adjusting circuit adopts the three-terminal integrated voltage stabilizing chip LM317 to perform filtered stabilization. When the load changes or the power supply voltage fluctuates, it can output a stable DC voltage. And change the variable resistance of the adjustment end of LM317 to realize the adjustment of the output power supply voltage to reach the predetermined output power supply voltage.DC power supply output voltage detection uses the on-chip  ADC of the microcontroller to detect the output voltage in real-time. It converts the output power voltage into a digital quantity and displays it in real time by the LCD display circuit. The display circuit adopts a character-type liquid crystal module to display. After the digital quantity converted by ADC is processed by the controller, the liquid crystal is driven to realize the digital display of the output voltage value of the power supply.IV Circuit Design and Parameter4.1 Selection of Power TransformerThe maximum output of DC voltage is 15V. Considering that the three-terminal integrated voltage regulator has a voltage drop of about 1 to 2V, the voltage Uc after the capacitor is filtered is about 17V. Then the effective value of the secondary output voltage of the transformer is U2=Uc/1.2=17V/1.2=14.2V. Because it is a low-power power supply, we choose a small 15V/20W power transformer.4.2 Rectifier Filter CircuitThe selection of rectifier bridge is mainly based on two parameters:The withstand voltage VRM of the rectifier diode;The average ID of the current through the rectifier diode.Here, we choose IN4007 rectifier diodes to form a full-bridge rectifier circuit.The parameters of its forward average current of 1A and withstand voltage of 1000V meet the rectification requirements. And, the filter capacitor has an empirical value of 470~1000μF. In order to suppress the ripple, an electrolytic capacitor with a nominal value of 1000μF with a voltage of 25V is selected.4.3 Output Adjustable Voltage Regulator CircuitIn this design, LM317 can be debugged and integrated three-terminal regulator as a regulator chip and realize the adjustment function of the output voltage. LM317 has the characteristics of continuously adjustable output voltage and wide adjustment range. Compared with other regulators, its linear regulation rate and load regulation rate have obvious advantages.There are over-current protection circuits and safety zone protection circuits inside LM317. Its output voltage is 1.25~37V, and the load current can reach 1.5A. The LM317 output voltage is easy to adjust, and only two external resistors are needed to set the output voltage. In order to improve the transient response, a capacitor can be connected in parallel at the output.The typical parameters of LM317 circuit are as follows:The output current is 1.5A;0.01% linear adjustment rate;0.1% load regulation rate;The ripple rejection ratio is 80dB;It has the functions of over-current protection, over-heat protection, output short-circuit protection, and regulator safety zone protection.The output adjustable voltage stabilizing circuit design based on LM317 is shown as in Fig. 2.　　Figure 2. lm317 Voltage Regulator CircuitR1 and Rp in the circuit are the key components that determine the output voltage. The power supply voltage output is determined by the ratio between the two and the internal reference voltage, as shown in equation (3). The values of R1 and Rp are considered from two aspects:From the formula (3) the output voltage calculation formula, the ratio of Rp/R1 determines the output, so Rp uses a variable resistor to facilitate adjustment;Considering the minimum output current, the minimum operating current when LM317 works normally is generally 1.5mA, and R1 is the only path through which the minimum current is discharged when there is no load.If the value of R1 is selected too large, there will be a big difference between the output voltage under no load and under load, which is not allowed.Considering the above two aspects, R1 and Rp are calculated as follows:Taking U0=15V, we can get Rp/R1=11. Knowing that R1 can work normally when the current reaches 1.5mA, it is necessary to find that R1 should be less than the resistance limit range of 830Ω, so R1=120Ω. Then the corresponding Rp resistance value should be 11×0.12kΩ=1.32kΩ, which can ensure that the power output reaches 15V. The nominal value of 2.2kΩ potentiometer is used for Rp to adjust the output voltage.D1 and D2 are diodes for protecting LM317. When the input terminal is accidentally short-circuited, D1 is turned on, and C4 is discharged through D1. When the output terminal is short-circuited, D2 is turned on and C2 is discharged through D2 to protect LM317 from being burned. Here, D1 and D2 are both  1N4001.C1 and C3 can filter out higher harmonics, and C4 can be used to improve the transient response of the load. Here C1, C3 take 0.1μF, and C4 take 470μF.4.4 ADC Voltage Detection and Display CircuitPower supply voltage detection uses low-cost STC microcontroller STC12C5410AD and uses its on-chip 10bit ADC to complete voltage detection A/D conversion. And the STC microcontroller directly controls the character LCD 1602 to display the output voltage of the power supply. The voltage detection and display circuit are shown in Figure 3. This solution can flexibly expand the monitoring function of the digital display power supply, and directly monitor the output current value after adding the current detection circuit.The core chip of the output voltage detection circuit  STC12C5410AD microcontroller has 8 channels of 10-bit ADC, which can detect multiple DC voltages. C8, C9, JT1 form a crystal oscillator circuit, C13, and R13 form a power-on reset circuit, and together with STC12C5410AD form the smallest single-chip microcomputer system. Taking into account the adjustability of the LM317 output, the minimum system power supply alone uses the auxiliary power supply composed of 7805 and also provides a 5V power supply voltage for the liquid crystal module.The voltage to be measured of the voltage detection circuit comes from the power supply voltage VIN output by the LM317 circuit, and its voltage range is 1.25 to 15V. The specific voltage value is adjusted and determined by the Rp potentiometer. The power supply voltage VIN is sent to the ADC pin P1.1/AD1 of STC12C5410AD after the circuit is attenuated and amplified. We should consider the case where the maximum power supply voltage to be tested is 15V, which has exceeded the test range (0-5V) of the microcontroller ADC. Therefore, VIN is first divided by 1/6 through the voltage divider resistors R1 and R2 and then connected to the same phase amplifier composed of TL084 for 2 times amplification and conditioning. Ensure that when the maximum power output is 15V, the voltage sent to the ADC channel P1.1 of the microcontroller does not exceed 5V. There is a linear relationship between the power supply voltage VIN to be tested and the input voltage VAD1 of the AD1 port of the microcontroller.The display unit adopts an LCD1602  character liquid crystal module, which is controlled by a single-chip microcomputer to realize the digital display of the power supply voltage. The LCD enable terminal EN, read-write control R/W, and data/address control terminal R/S are controlled by P3.0, P3.7, and P3.5 of the single-chip microcomputer respectively. At the same time, the 8-bit display data D0～D7 and the instruction address code sent to the LCD are controlled by the P2 port. The contrast of the liquid crystal is adjusted by the voltage Vo output by the adjustable potentiometer. The digital quantity that detects the output voltage of the power supply is converted by the single-chip microcomputer into the ASCII code of the actual voltage value and sent to the LCD for display. The corresponding relationship is shown in formula (5).Figure 3. Voltage Detection and Display Circuit V Power Debugging and Testing5.1 Power Debugging IssuesLM317 output 1.25 ~ 15V circuit debugging is relatively simple, the power device circuit board adopts double-sided printed board PCB design, assembly welding power transformer, rectifier filter circuit, LM317 voltage regulating circuit, voltage detection microcontroller and LCD module and other components are can.The adjustable digital display regulated power supply is shown in Figure 4.Since the voltage output range of LM317 is 1.25~37V, Iadj in the voltage calculation formula is very small (50μA) and can be ignored. The resistance of the potentiometer is 2.2kΩ to meet the adjustment range of output voltage 1.25~15V. Considering the convenience of adjustment, the WXD3-13-2W multi-turn winding potentiometer can be used as a precision adjustment knob.In order to improve the ADC detection accuracy of the output voltage, the parameter detection correction coefficient can be added to the detection program, and the detection accuracy can be further improved through actual measurement correction.During debugging, when the power supply outputs low voltage and high current, the voltage difference and current carried by the LM317 circuit will be large, which will produce large power consumption. Therefore, the LM317 chip in the power supply should be packaged with TO-220 and a small heat sink Play a role in heat dissipation protection.Figure 4. Adjustable Digital Display Power SupplyLM317 adjustable three-terminal regulator, the minimum output voltage is 1.25V. If the regulated power supply is required to be adjusted from 0V, a negative voltage bias should be added to the regulator circuit. The power input requires three input terminals, positive, negative and ground. The circuit is relatively complicated. Generally, the regulated power supply requires less from 0V. Starting tune. Therefore, the power supply is adjusted directly from 1.25V.5.2 Test and AnalysisDC voltage stabilization tests the output voltage and output current characteristics of the power supply. Here, we select the typical load RL=100Ω and RL=10Ω, adjust the power output and test the output voltage and load current. The test results are shown in Table 1.Under two typical load conditions, the relative error of the output voltage indicated by the power supply can be better than 0.254%, and the accuracy is basically 0.25. In addition, the power supply has good load characteristics, and the output voltage does not fluctuate greatly with the increase of load current.The load characteristics under the rated output voltage of 15V are shown in Table 2. Under the condition that the power supply is output under light load and the voltage reaches the rated value of 15V, gradually increase the load current, and test the load characteristics of the power supply, that is, the change characteristics of the output voltage of the power supply. The result shows that when the load current changes from 0.1A to 1.2A, the voltage fluctuation of 15V constant voltage output is only 0.12V. This shows that this power supply has a good load capacity.VI ConclusionThis article designs a low-power DC regulated power supply with digital display and output adjustable functions based on LM317. The power supply is based on the low-cost single-chip STC12C5410AD for voltage sampling detection and driving liquid crystal display, which realizes the real-time detection and output display of the power supply voltage.The test results show that the power supply achieves a continuously adjustable output of 1.25V to 15V. It has the characteristics of stable operation, high output accuracy, and intuitive display. The output detection accuracy reaches 0.25 level; the power output is realized by flexible voltage detection and LCD display. The monitoring function can accurately reflect the working status of the power output in time,This design combines the adjustability of the regulated power supply with the digital display to provide a convenient power supply solution for electronic testing.Component DatasheetLM317 DatasheetFAQWhat type of chips are used to design and manufacture miniaturized low-power DC stabilized power supplies?Low-cost stabilized chips and digital display modulesWhat does the low-power stabilized power supply convert the mains into?Stabilized DC outputWhat is lm317 used for?The LM317 serves a wide variety of applications including local, on card regulation. This device can also be used to make a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM317 can be used as a precision current regulator.What is the maximum input voltage of lm317?The LM317 is an adjustable voltage linear regulator that can output 1.25 – 37V at up to 1.5A current with an input voltage range of 3 – 40V.What is the difference between lm317 and lm317t?Member. There is no functional difference as they are one in the same. The T at the end just indicates that it's in a TO-220 package. They usually tag on extra things after the part name to reference things like package, temp range, etc.Is lm317 a transistor?The LM317 is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 32 V. ... By using a heat-sinked pass transistor such as a 2N3055 (Q1) we can produce several amps of current far above the 1.5 amps of the LM317.How does an lm317 work?The circuit consists of a low-side resistor and high-side resistor connected in series forming a resistive voltage divider which is a passive linear circuit used to produce an output voltage which is a fraction of its input voltage. What is IC lm317?The LM317 device is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V. It requires only two external resistors to set the output voltage. The device features a typical line regulation of 0.01% and typical load regulation of 0.1%.How do I know if my lm317 is working?Testing lm317t.If you look to the ic, the legs towards you, the right one is the input pin. you must see a difference of minimum 1.2V between the two pins, otherwise the IC is faulty. furthermore, the first test is to see if you have input voltage !What is the working priciple of lm317?LM 317 works on a very simple principle. It is a variable voltage regulator i.e. supports different output voltage levels for a constant applied input voltage supply.How to make a simple voltage regulator circuit using LM317? 

I Introduction 1.1 What is LM2596?The LM2596 series of regulators are monolithic integrated circuits. These circuits can provide all the active functions for a step-down (buck) switching regulator.  capable of driving a 3-A load with excellent line and load regulation. These devices are also available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version.1.2 What is LM2577?The LM2577 is a monolithic integrated circuit that provides all of the power and control functions for step-up  (boost), flyback, and forward converter switching regulators. The device is available in three different output voltage versions: 12V, 15V, and adjustable.Figure 1. LM2596CatalogI Introduction 1.1 What is LM2596?1.2 What is LM2577?II Circuit Structure2.1 Power Transformer2.2 Rectifier Circuit2.3 Filter Circuit2.4 Voltage Regulator CircuitIII Power Supply Overview3.1 Introduction to Power Supply3.2 Comparison of 2 Types of Power Supplies3.3 The Power Supply SelectionIV Performance Indicators4.1 Working Mode4.2 PCB and Printed Circuit BoardFAQOrdering & QuantityII Circuit Structure2.1 Power TransformerWe need DC  power. By adopting a step-down transformer, the grid AC voltage  220V is transformed into a composite  AC  power source. After this AC voltage is rectified, the  DC voltage required by the electronic device can be obtained.2.2 Rectifier Circuit  Use a single-phase bridge rectifier circuit. By using this circuit, it is possible to convert 50 Hz alternating current with varying directions and magnitude. Here, we need to transform it into a direct current in the same direction but still pulsating in magnitude. So what are the benefits of doing this? They are as follows:Higher voltage;Smaller ripple voltage;Make the maximum reverse  AC current that the rectifier diode bears flow;High utilization rate of the transformer.2.3 Filter Circuit  We can use the properties of the capacitor C (the energy storage element). That is, the voltage across the capacitor cannot change suddenly. In this way, by using an RC filter circuit to filter out most of the pulsating component's output by the rectifier circuit.  we can get a relatively smooth direct current.2.4 Voltage Regulator CircuitThe rectified and filtered DC voltage does not change with the disturbance of the AC power grid and load. Here, due to the adoption of a large number of high-performance integrated modules, the circuit structure is simplified. The result of this is that, the key part of the power conversion problem is highlighted. Through hard debugging and testing, the overall circuit performance is good and the design purpose can be better achieved.As a variable voltage stabilizer or current stabilizer source, this power supply can not only be used alone, but also can be placed in other electronic equipment.III Power Supply Overview3.1 Introduction to Power SupplyThe power supply is the heart of electronic equipment. The quality of the power supply directly affects the reliability of electronic equipment. Since 60% of the failures of electronic equipment come from the power supply, as the basic component of the electronic equipment, the power supply has received more and more attention.The power supplies used in modern electronic equipment roughly fall into 2 categories: linear regulated power supplies and switching regulated power supplies.3.2 Comparison of 2 Types of Power Supplies3.2.1 Linear Regulated Power SupplyThe so-called linear regulated power supply has the following meaning. The regulator tube in the regulated power supply circuit works in the linear amplification area. After the 220V, 50Hz power frequency voltage is stepped down by a linear transformer, it is rectified, filtered, and stabilized to output a DC voltage.Advantages:High power supply stability and load stability;Small output ripple voltage;Fast transient response speed;The line structure is simple and easy to maintain;No switch interference.Disadvantages:High power consumption and low efficiency, the efficiency is generally only 35~60%;Big volume, heavyweight, and cannot be miniaturized;Must have a larger capacity filter capacitor.Among them, the low switching efficiency is an important shortcoming, causing a serious waste of resources. In this context, the switching power supply came into being. Any electronic device needs a DC power supply to supply the circuit to work. Especially electronic products powered by the power grid.Now that there are grid voltage fluctuations and changes in the working state of the circuit, we need to find ways to adapt. In terms of power supply, it is necessary to have a DC-regulated power supply that adapts to this change.With the development of electronic technology, people have entered in-depth research on how to improve power conversion efficiency. Thus enhancing the adaptability to the power grid, reducing the volume, and reducing the weight. So the switching power supply came into being.3.2.2 Switching Regulated Power SupplyAdvantage:High exchange efficiency. The regulator tube of the switching regulated power supply works in the switch state. Its main advantage is that the exchange efficiency can be as high as 70-95%.Low power consumption and high efficiency. Under the excitation of the excitation signal, the transistors alternately work in the on-off switching state. At the same time, the switching speed is very fast, and the frequency is generally about 50kHz. The power consumption of the switching transistor is very small, and the efficiency can be improved to over 80%.Small size and lightweight. No bulky power frequency transformer is used in the switching power supply. After the power dissipation on the adjustment tube is greatly reduced, a larger heat sink is omitted.Wide voltage regulation range. The output voltage of the switching power supply is adjusted by the duty cycle of the excitation signal. The change of the input signal voltage can be controlled by frequency modulation or width modulation. When the power frequency grid voltage changes greatly, it can still ensure an effective and stable output voltage.There are also many methods for switching regulated power supplies to achieve voltage regulation. According to actual application requirements, we can choose different types of switching regulated power supplies.Disadvantages:The circuit is more complicated. The output ripple voltage is high and the transient response is poor. There is also more serious switching interference. Nowadays, difficulties in further promotion and application of switching regulated power supplies are as follows: First, the production technology is difficult; Second, the maintenance is troublesome; Last, the cost is high.High requirements for circuit components. The efficiency of the switching power supply is proportional to the switching speed of the switching tube. A switching transformer is used in the switching power supply. The switching transformer can be input by one group, and get multiple outputs with different polarity and size. To further improve efficiency, the operating frequency of the power supply must be increased. However, when the frequency is increased, the requirements would have been further improved.Affect the normal operation of nearby electronic equipment. The stabilized power supply has the dual functions of voltage stabilization and filtering. Therefore, the series linear regulated power supply does not produce switching interference. And the ripple voltage output can also be small. However, when the switch tube in the switching regulated power supply is in the on-off state, things have changed. Its alternating voltage and the output current will produce strong spike interference and resonance interference through the components. These interferences will enter the main grid and affect the normal operation of nearby electronic devices.3.3 The Power Supply SelectionAccording to the comparison, we choose a linear power supply.Most electronic circuits require a DC power source to work. The DC power supply is the guarantee of the working state of electronic circuits and the provider of energy. But most fixed power supplies allow the output voltage to vary within ±10%, which still cannot meet the requirements of some circuits. So we designed a power supply with adjustable output or allowing a larger range of variation.The performance of this power supply: On the one hand, it is designed and made with all integrated circuits and has the function of automatic short-circuit and overload protection. On the other hand, it has high accuracy, stable current performance, and continuous adjustment. Besides, it can be used for multiple experimental power.IV Performance Indicators4.1 Working ModeThe output voltage can be adjusted and changed throughout the current range. This power supply can also work in a DC source mode within a certain range.Let's introduce the work produced by a netizen.First, the 18V AC output from the transformer is converted into 20V DC through a rectifier filter circuit. As shown below.Figure 2. Rectifier Filter CircuitAnd then the adjustable step-down regulator circuit composed of LM2596  -ADJ outputs a voltage of 1.25 to 19V. The circuit is shown in the figure below. Adjusting RW1 can change the output voltage, and increasing the input voltage can increase the output. The maximum supply voltage is 45V.Figure 3. LM2596 Adjustable Step-down Regulator CircuitThen through the step-up voltage regulator circuit composed of LM2577.  The output voltage of LM2596  is increased by 1 to 11 times. That is to say, if RW1 is adjusted to make LM2596 output 3V, RW2 in LM2577  is adjusted to the output voltage of 3 to 33V. The figure of the circuit is shown below. Changing the resistance of RW2 and the input voltage of LM2577  can output a voltage of 3 to 100V.Figure 4. LM1577 Step-up Voltage Regulator CircuitUnder the condition of the input voltage of 220V, 50HZ and the voltage range of +15%～-20% of the modified regulated power supply:The adjustable range of output voltage is +1.25V～input voltage;The maximum output current is 5A;The voltage adjustment rate is not more than 0.5%;The load adjustment rate is not more than 2%;The highest input voltage and output ripple voltage at full load are not more than 10mV.DC-DC converter, under the condition of input voltage +2.6V～+18V:The output voltage is adjustable from +2.6V to 100V;The maximum output current is 3A;Voltage regulation rate is not more than 1.5%, the load regulation rate is not more than 3%;The power supply also has over-current and short-circuit protection functions. After eliminating the short-circuit fault, it will automatically return to the normal state. Anti-reverse connection, diodes form a voltage indicator.4.2 PCB and Printed Circuit BoardThe pictures below are the PCB drawn by a netizen and the printed circuit board.Figure 5. PCB and Printed Circuit BoardFAQWhat is the LM2596 series of regulators?Monolithic integrated circuitsHow many different output voltage versions is the LM2577 available?12V, 15V, and adjustable.How much of the failures of electronic equipment come from the power supply?60%What are the two categories of power supplies used in modern electronic equipment?Linear regulated power supplies and switching regulated power suppliesWhat is lm2596?The LM2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3-A load with excellent line and load regulation.What is the difference between LM2596 and LM2595?LM2596: The highest output current is 3A, 1PIN-VOUT, 2PIN-VIN;LM2595: The highest output current is 1A, 1PIN-VIN, 2PIN-VOUT.What is the voltage of each pin of LM2596-12? What is the function of each pin?Pin 1 is the input terminal, 12V, the normal working voltage range should be 14V~37V under the output condition; pin 2 is the output terminal, here is the high-frequency oscillation output, not DC voltage, so there is no definite voltage; pin 3 is grounded, 0V ; Pin 5 is the enable control terminal, LM2596 works normally when connected to a low level, and no output is turned off when connected to a high level, usually directly grounded; Pin 4 is the feedback control signal input terminal, connected to the middle connection point of the proportional resistor, where the voltage It is proportional to the actual output.Can LM2596 output negative voltage?LM2596 can output negative voltage.LM2596 has different application circuits, which can output positive voltage or negative voltage, but it has no boost function, and the absolute value of its output voltage must be less than the absolute value of the input voltage.In the circuit with adjustable output voltage of lm2596, can the output voltage be greater than the input voltage?The LM2596 switching voltage regulator is a step-down power management monolithic integrated circuit, which can output 3A drive current and has good linearity and load regulation characteristics. The output voltage will not be greater than the input voltage. If the output voltage is greater than the input voltage, it is best to use a step-up power chip. Such as XL6009, VT1050.