The Kynix Components

Product OverviewThe TDA8954 is a stereo or mono high-efficiency Class D audio power amplifier in a single IC featuring low power dissipation. It is designed to deliver up to 2 × 210 W into a 4 Ω load in a stereo Single-Ended (SE) application, or 1 × 420 W into an 8 Ω load in a mono Bridge-Tied Load (BTL) application. It combines the benefits of Class D efficiency (≈93 % into a 4 Ω load) with audiophile sound quality comparable to that associated with Class AB amplification. This blog will introduce TDA8954TH systematically from its features, pinout to its specifications, applications, also including LM3900 datasheet and so much more. CatalogProduct OverviewRelated Video IntroductionTDA8954TH FeaturesTDA8954TH PinoutTDA8954TH ApplicationsTDA8954TH Circuit DiagramTDA8954TH Block DiagramTDA8954TH PackageTDA8954TH SpecificationTDA8954TH ManufacturerTDA8954TH DatasheetUsing WarningsTDA8954TH FAQ Related Video Introduction Video: Datang Lagi Power Class D TDA8954TH 420w + 420w XH-M252 XR-N252 SKU-009172 2020-07-06 TDA8954TH FeaturesHigh output power in typical applications:-SE 2 × 210 W, RL = 4 Ω (VDD = 41 V; VSS = −41 V)-SE 2 × 235 W, RL = 3 Ω (VDD = 39 V; VSS = −39 V)-SE 2 × 150 W, RL = 6 Ω (VDD = 41 V; VSS = −41 V)-BTL 1 × 420 W, RL = 8 Ω (VDD = 41 V; VSS = −41 V)Symmetrical operating supply voltage range from ±12.5 V to ±42.5 VStereo full differential inputs, can be used as stereo SE or mono BTL amplifierLow noiseSmooth pop noise-free start-up and switch offpin diagnostics for protection circuitsFixed frequency internal or external clockHigh efficiency ≈93 %Zero dead time switchingLow quiescent currentAdvanced protection strategy: voltage protection and output current limitingThermal FoldBack (TFB) with disable functionalityFixed gain of 30 dB in SE and 36 dB in BTL applicationsFully short-circuit proof across loadBD modulation in BTL configurationClock protection TDA8954TH PinoutThe following figure is the diagram of TDA8954TH pinout. TDA8954TH Pinout TDA8954TH ApplicationsDVDHome Theater In A Box (HTIAB) systemMini and micro receiver „High-power speaker systemSubwoofers „Public Address (PA) system TDA8954TH Circuit DiagramThe following are the circuit diagrams of TDA8954TH. TDA8954TH Circuit Diagram Input configuration for mono BTL application TDA8954TH Block DiagramThe following figure shows the block diagram of TDA8954TH TDA8954TH Block Diagram TDA8954TH PackageThe following diagram shows the TDA8954TH package. TDA8954TH Package TDA8954TH SpecificationProduct AttributeAttribute ValueManufacturer:NXPProduct Category:Audio AmplifiersBrand:NXP SemiconductorsProduct Type:Audio AmplifiersSubcategory:Audio ICsAmplifier ClassDOutput Power210WLoad Impedance4ohmOperating Temperature Range -40°C to +85°CNo. of Pins24 TDA8954TH ManufacturerNXP Semiconductors enables secure connections and infrastructure for a smarter world, advancing solutions that make lives easier, better and safer. As the world leader in secure connectivity solutions for embedded applications, NXP is driving innovation in the secure connected vehicle, end-to-end security and privacy and smart connected solutions markets. TDA8954TH DatasheetYou can download TDA8954TH datasheet from the link given below:TDA8954TH Datasheet Using WarningsNote: Please check their parameters and pin configuration before replacing them in your circuit. TDA8954TH FAQWhat does an audio amplifier do?The goal of audio amplifiers is to reproduce input audio signals at sound-producing output elements, with desired volume and power levels—faithfully, efficiently, and at low distortion. What are the 3 types of amplifiers?There are three different kinds of amplifier gain which can be measured and these are: Voltage Gain ( Av ), Current Gain ( Ai ) and Power Gain ( Ap ) depending upon the quantity being measured with examples of these different types of gains are given below. What is the difference between audio and power amplifier?A transistor which is suitable for power amplification is known as a power transistor. It differs from other transistors mostly in size. It is normally larger for handling the large amount of power it delivers. Audio power amplifiers are used to deliver a large amount of power to a low resistance load.

I. IntroductionThe 74HC595 is an 8-bit serial-in or parallel-out shift register with a storage register and 3-state outputs. 74HC595 with the characteristics of high speed, low power consumption, and simple operation, can be easily used in the MCU interface to drive LED  operation. This article introduces the circuit design of LED displays driven by 74HC595.CatalogI. IntroductionII. Basic Description2.1 LED Display2.2 74HC595III. Circuit Design3.1 Hardware Circuit3.2 Display DriverIV.  ConclusionFAQOrdering & QuantityII. Basic Description2.1 LED DisplayA 7 Segment LED Display, also known as an LED  display, has been widely used in various instruments because of its low price, low power consumption, and reliable performance. There are many types of LED  drivers on the market, and most of them have multiple functions, but the price is correspondingly higher. If used in a simple system with low cost, it is not only a waste of resources but also increases the cost of products. Using a 74HC595 chip to drive LED has various disadvantages. High speed, low power consumption, unlimited number of  LED s. It can control both the common cathode LED display and the common anode LED display. The circuit designed with 74HC595  is not only simple but also low in power consumption and strong in driving ability. It is a low-cost and flexible design scheme.2.2 74HC595The 74HC595 is an 8-bit serial-in/serial or parallel-out shift register with a storage register and 3-state outputs. Both the shift and storage register have separate clocks. The device features a serial input (DS) and a serial output (Q7S) to enable cascading and an asynchronous reset MR input. A LOW on MR will reset the shift register. Data is shifted on the LOW-to-HIGH transitions of the SHCP input. The data in the shift register is transferred to the storage register on a LOW-to-HIGH transition of the STCP input. If both clocks are connected together, the shift register will always be one clock pulse ahead of the storage register. Data in the storage register appears at the output whenever the output enable input (OE) is LOW. A HIGH on OE causes the outputs to assume a high-impedance OFF-state. Operation of the OE input does not affect the state of the registers. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.Figure 1. 74HC595 Functional DiagramFigure 2. 74HC595 Logic SymbolIII. Circuit Design3.1 Hardware CircuitFigure 3 is a display panel circuit designed with AT89C2051 and  74HC595 interface.Figure 3. Circuit of Display PanelThe P115, P116, and P117 of the P1 port are used to control the display of the LED.  and they are connected to the SLCK, SCLK, and SDA pins respectively. Three digital tubes are used to display the voltage value. On the circuit board, LED3 is on the far left and LED1 is on the far right. When sending data, first send the display code of LED3, and finally, send the display code of LED1. The brightness of the  LED is controlled by the resistance of PR1 to PR3.2.2 Display DriverUse DISP1, DISP2, and DISP3 to store display data. After the CPU initialization is complete, call the LRDISP subroutine to clear the register of 74HC595. There is no need to call the clear subroutine before calling the display subroutine DISPLAY. Now write the two subroutines as follows.①CLRDISP:MOVR2，#24CLRBIT：CLRSCLKCLRCMOVSDA，CSETBSCLKDJNZR2，CLRBITRET②Display:CLRSLCKMOVR3，#3MOVR0，#DISP3DISP1：MOVA，@R0MOVR2，#8DISP2：CLRSCLKRLCAMOVSDA，CSETBSCLKDJNZR2，DISP2DECR0DJNZR3，DISP1SETBSLCKRETIV. ConclusionIt can be seen from the above examples that there are no complicated technical problems in the design of hardware and software when 74HC595 is used to design an LED driver circuit. In addition, 74HC595 can be used not only to drive LED displays but also to drive light-emitting diodes. Each 74HC595 can drive 8 LEDs simultaneously. This solution is ideal when the volume requirements of the product are not high and want to reduce the cost. FAQWhere can the 74HC595 be used to drive LED operation?MCU interfaceWhat does the 74HC595 feature to enable cascading and an asynchronous reset MR input?A serial input (DS) and a serial output (Q7S)What is 74HC595?74HC595 is a shift register which works on Serial IN Parallel OUT protocol. It receives data serially from the microcontroller and then sends out this data through parallel pins. We can increase our output pins by 8 using the single chip.What is a 74hc595n?8-bit Shift Register 74HC595NA shift register is a chip you can use to control many outputs (8 here) at the same time while only using a few pins (3 here) of your Arduino.How does a shift register work?Shift registers hold the data in their memory which is moved or “shifted” to their required positions on each clock pulse. Each clock pulse shifts the contents of the register one bit position to either the left or the right.How 74HC595 Shift Regiester works?The 595 has two registers (which can be thought of as “memory containers”), each with just 8 bits of data. The first one is called the Shift Register. The Shift Register lies deep within the IC circuits, quietly accepting input.How does an 8 bit shift register work?The SN74HC595N is a simple 8-bit shift register IC. Simply put, this shift register is a device that allows additional inputs or outputs to be added to a microcontroller by converting data between parallel and serial formats. Your chosen microprocessor is able to communicate with the The SN74HC595N using serial information then gathers or outputs information in a parallel (multi-pin) format. Essentially it takes 8 bits from the serial input and then outputs them to 8 pins.

Overview of IR2104Video related to IR2104IR2104 PinoutIR2104 Block DiagramIR2104 SchematicRecommended Operating Conditions of IR2104IR2104 FeaturesIR2104 EquivalentsHow to use IR2104 MOSFET?IR2104 ApplicationsIR2104 Packaging informationIR2104 FAQ Overview of IR2104Power MOSFET and IGBT drivers with dependent high and low side referenced output channels make up the IR2104(S). Ruggedized monolithic construction is made possible by proprietary HVIC and latch immune CMOS technology. The conventional CMOS or LSTTL output is compatible with the logic input down to 3.3V.A high pulse current buffer stage with minimal driver cross-conduction is a feature of the output drivers. An N-channel power MOSFET or IGBT with a high side configuration that runs from 10 to 600 volts can be driven via the floating channel. Video related to IR2104Video Description: Hi, I’m William. In today's video will show you how to make a simple 12V to 220V DC to AC Inverter based on the IR2104 Half bridge driver IC and 555 timer square wave generator. IR2104 PinoutIR2104 Pinout Pin NumberPin NameDescription1VCCLogic and internal gate drive supply voltage2INInput Pin3SDShutdown Pin (Active Low)4COMChip power and signal ground5LOLow side gate driver output6VSHigh side floating supply return7HOHigh side gate driver output8VBHigh side gate driver floating supplyIR2104 Block DiagramIR2104 Block Diagram IR2104 SchematicIR2104 Schematic Recommended Operating Conditions of IR2104TA, Ambient temperature: -40 to 125°C.VS, the VCC supply voltage for low side and logic: 10 to 20V.Meanwhile, VB, high side absolute voltage: VS + 10 to VS + 20.The high side of floating output voltage: VS to VB.Also, high side floating offset voltage: Note 1  to 600V.The logic input voltage range: is 0 to VCC.Also, the output voltage for the low side: is 0 to VCC. IR2104 FeaturesGate drive supply range from 10 to 20VUndervoltage lockout3.3V, 5V and 15V input logic compatibleCross-conduction prevention logicInternally set deadtimeHigh side output in phase with inputShut down input turns off both channelsMatched propagation delay for both channelsAlso available LEAD-FREE IR2104 EquivalentsDGD2104IR2103IR2153IR2110 IR2104 Typical ConnectionIR2104 Typical Connection How to use IR2104 MOSFET?The schematics below display the IR2104 Gate Driver's typical application diagram. Remember that the bootstrap capacitor and diode are essential for driving the high side. The bootstrapping capacitor's value will have an impact on high-side switching.IR2104 ApplicationsInvertersSwitch mode power suppliesPower toolsMotor driversRobotics IR2104 Packaging informationIR2104 Packaging Information IR2104 FAQHow does a half bridge gate driver work?To drive the gates of high- and low-side N-channel MOSFETs (or IGBTs) with a low output impedance to reduce conduction losses and a quick switching time to reduce switching losses, one must use an isolated half-bridge driver. What is IR2104?Power MOSFET and IGBT drivers with dependent high and low side referenced output channels make up the IR2104(S). Ruggedized monolithic construction is made possible by proprietary HVIC and latch immune CMOS technology. The conventional CMOS or LSTTL output is compatible with the logic input down to 3.3V. How to use IR2104 MOSFET?The schematics below show the typical application diagram for the IR2104 Gate Driver. Keep in mind that the diode and bootstrap capacitor are necessary for driving the high side. The size of the bootstrapping capacitor will affect high-side switching.

CatalogProduct OverviewTDA8510J CAD ModelsTDA8510J Pin ConfigurationTDA8510J Block DiagramTDA8510J FeaturesTDA8510J DatasheetTDA8510J SpecificationsTDA8510J ManufacturerUsing WarningTDA8510J FAQ Product OverviewThe TDA8510J is an integrated class-B output amplifier in a 17-lead single-in-line (SIL) power package. It contains a 26 W Bridge-Tied Load (BTL) amplifier and 2 × 13 W Single-Ended (SE) amplifiers. The device is primarily developed for multi-media applications and active speaker systems (stereo with subwoofer). TDA8510J CAD ModelsFigure: TDA8510J PCB Symbol   Figure: TDA8510J Footprint   Figure: TDA8510J 3D Models TDA8510J Pin ConfigurationFigure: TDA8510J Pin Configuration TDA8510J Block DiagramFigure: TDA8510J Block Diagram TDA8510J FeaturesRequires very few external componentsHigh output powerLow output offset voltage (BTL channel)Fixed gainDiagnostic facility (distortion, short-circuit and temperature detection)Good ripple rejectionMode select switch (operating, mute and standby)AC and DC short-circuit safe to ground and to VPLow power dissipation in any short-circuit conditionThermally protectedReverse polarity safeElectrostatic discharge protectionNo switch-on/switch-off plopFlexible leadsLow thermal resistanceIdentical inputs (inverting and non-inverting). TDA8510J DatasheetYou can download the datasheet from the link given below:TDA8510J Datasheet TDA8510J SpecificationsTypeDescriptionCategoryIntegrated Circuits (ICs)LinearAmplifiersAudio AmplifiersMfrNXP USA Inc.PackageTubeProduct StatusObsoleteTypeClass BOutput Type2-Channel (Stereo) with SubwooferMax Output Power x Channels @ Load26W x 1 @ 4Ohm; 13W x 2 @ 2OhmVoltage - Supply6V ~ 18VFeaturesDepop, Mute, Short-Circuit and Thermal Protection, StandbyMounting TypeThrough HoleOperating Temperature-40°C ~ 85°C (TA)Supplier Device PackageDBS17PPackage / Case17-SIP Formed LeadsBase Product NumberTDA851 TDA8510J ManufacturerNXP Semiconductors is a leading supplier of embedded controllers offering a broad portfolio of MCUs with Arm-based processors and microcontrollers for a variety of industries including automotive, wireless connectivity and more. They continue to drive innovation offering a strong Power Management portfolio for industrial and automotive applications, including multiple power supplies and battery management solutions. NXP products power and connect across the globe building solutions, helping enhance the proficiency of people, organizations and the world has a whole. Using WarningNote: Please check their parameters and pin configuration before replacing them in your circuit. TDA8510J FAQWhat is power amplifier explain?A power amplifier (PA) converts a low-power signal to a higher power one. Two common examples are audio amplifiers, used to drive loudspeakers and headphones, and RF power amplifiers, such as those used in the final stage of a transmitter. What is the difference between amplifier and power amplifier?An amplifier which is designed to increase the level of input signal is called a voltage amplifier. A type of amplifier which is designed to boost the power level of the input signal is called a power amplifier. What is the main function of amplifier?An amplifier is an electronic device that increases the voltage, current, or power of a signal. Amplifiers are used in wireless communications and broadcasting, and in audio equipment of all kinds. 

I DescriptionThis blog introduces a pulse width modulation technology with TL494 as the control core. And it is applied to DC motor control system. The working principle of the system, the realization circuit and the structure and specific application of the PWM control chip are analyzed in detail.CatalogI DescriptionII Working Principle and Realization of Control System2.1 How System Works2.2 Selection of PWM Control Chip2.3 Realization Circuit of SystemIII Simulation ResultsIV ConclusionFAQOrdering & QuantityII Working Principle and Realization of Control System2.1 How System WorksThe basic design idea of this control system is to use a step-down chopper circuit as shown in Figure 1.Figure 1. Step-down Chopper Circuit and its WaveformIn the figure, the DC power supply is Ud, and the load is a motor (M). When the switching device (VT) is triggered and turned on, the DC voltage is applied to the motor for a duration of t1. When the field switching device is turned off, the voltage on the load is zero and lasts for t2 time. If we define the duty cycle T=t1+t2, and the duty cycle k=t/T, the waveform diagram and the principle of the DC chopper circuit are as follows:The average value (Uo) of the system output voltage is:The effective value (U) of its output voltage is:The pulse width modulation (PWM) working mode adopted by this system keeps T unchanged and t1 changes.The principle block diagram of the control system is shown in Figure 2.Figure 2. Control System Block DiagramThe power supply in this system makes the motor work through the power drive circuit. The on-off of the power drive circuit is controlled by the PWM control chip. The system samples the motor current feeds it back to the PWM control chip and compares it with the current value of the current comparison circuit. To control the PWM signal output to achieve the purpose of speed regulation. The system also samples the power supply voltage and feeds it back to the PWM control chip. In this way, it can be compared with the voltage value of the voltage comparison circuit to control the PWM signal output and achieve the effect of Undervoltage protection.We use the common BUCK circuit for the power drive circuit and Power MOSFET for the switch tube. The regulation of its output voltage is realized by controlling the turn-on time of the device. Considering the influence of the inductance of the motor, the output current is relatively stable and the energy consumption is low.2.2 Selection of PWM Control ChipIn the control circuit of the motor PWM control system, the TL494 chip is selected. TL494 chip has the features of strong anti-interference ability, simple structure, high reliability and low price.The internal circuit of TL494 (Figure 3) consists of the following parts:The reference voltage generating circuit;Oscillation circuit;Intermittent adjustment circuit;Two error amplifiers;Pulse width modulation comparator;Output circuit;...Figure 3. TL494 Internal StructureAmong them:For pins 1 and 2, they are the non-inverting and inverting input terminals of error amplifier 1.For pin 3, it is phase correction and gains control.For pin 4, it is an intermittent period of conditioning, and the cut-off time can be changed from 2% to 100% when a voltage of 0～3.3V is applied to it.For pins 5 and 6, they are used to connect external oscillation resistor RT and oscillation capacitor CT to determine the frequency fosc of the sawtooth wave generated by the oscillator.Where:The value range of RT and CT: RT=5～100kQ, CT=0.001～0.1μF.Pin 7 is the ground terminal;For pins 8, 9 and 11, 10, they are the collector and emitter of the two final output transistors inside TL494;For 12 feet, it is the power supply terminal;For pin 13, it is the output control terminal. When this pin is grounded, it is a parallel single-ended output mode. When pin 14 is connected, it is a push-pull output mode;For 14 feet, it is the 5V reference voltage output terminal, the maximum output current is 10mA;For 15 and 16 pins, they are the inverting and non-inverting input terminals of the error amplifier 2.2.3 Realization Circuit of SystemThe concrete realization circuit of this control system is shown in Fig. 4. The system uses current negative feedback to track the speed of the motor. At the same time, through the negative feedback of the voltage of the power supply, the system has the function of undervoltage protection.Figure 4. System Implementation CircuitThe motor current is detected and fed back to pin 1 of the error amplifier 1 of the TL494, compared with the current reference signal of pin 2 to control the PWM output of TL494. So as to realize the function of regulating the speed of the motor. By adjusting the resistance value of the adjustable resistor (RES1). That is, change the size of the set current reference signal to adjust the duty cycle of the PWM output signal. So as to achieve the purpose of adjusting the motor speed.By sampling the voltage of the power supply, it is fed back to pin 15 of the internal error amplifier 2 of TI494. Then compare with the voltage reference signal of pin 16 to control the PWM output of TL494. So as to realize the undervoltage protection function of the system.The system power is driven by Power MOSFET, which has a high input impedance and can be directly driven by a transistor. Pin 13 of TI494 is used to control the output mode. In this system, choose to input this end as low level. At this time, the flip-flops Q1 and Q2 in the TL494 do not work, the two outputs are the same, the frequency is the same as the oscillator frequency, and the maximum duty cycle is 98%.III Simulation ResultsIn order to verify the effectiveness of the system, we can simulate the circuit of the above-mentioned DC motor control system based on PWM technology by computer. We set the system's power supply voltage Ucc=12V, DC motor rated parameters: Un=12V, In=15A, 4 poles, armature resistance Ra=0.21Q, moment of inertia J=0.57kg㎡. Through changing the adjustable resistance RES1 of the control circuit to realize the different duty ratio of the system output. When the output duty ratio is 0.2, 0.65/0.8, the voltage and current waveforms of the motor are shown in Figure 5.Figure 5. Motor Voltage and Current WaveformIt can be seen from Figure 5 that when outputting different duty ratios, the voltage and current waveforms of the motor are stable, which is conducive to the long-term stable operation of the motor. This shows that the TL494-based PWM control technology introduced in this article is feasible in practical applications and runs stably.IV ConclusionThis blog summarizes a PWM control technology based on the TL494 chip. The simulation results show that the system has a simple structure, low energy consumption, and stable operation. And the characteristics of the TL494 chip have been fully utilized so that the system has the advantages of undervoltage protection.FAQWhat is TL494?TL494 is a PWM controller IC used for power electronics circuits. It comprises of on-chip two error amplifiers an oscillator with adjustable frequency feature, an output flip-flop having pulse steering control, and an output control circuit with feedback.What is the detailed description of TL494?The TL494 device incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the power-supply control circuitry to a specific application. The TL494 device contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits. The error amplifiers exhibit a common-mode voltage range from –0.3 V to VCC – 2 V. The dead-time control comparator has a fixed offset that provides approximately 5% dead time. The on-chip oscillator can be bypassed by terminating RT to the reference output and providing a sawtooth input to CT, or it can drive the common circuits in synchronous multiple-rail power supplies. The uncommitted output transistors provide either common-emitter or emitter-follower output capability. The TL494 device provides for push-pull or single-ended output operation, which can be selected through the output-control function. The architecture of this device prohibits the possibility of either output being pulsed twice during push-pull operation.What are TL494 product features?Complete PWM Power-Control CircuitryUncommitted Outputs for 200-mA Sink or Source CurrentOutput Control Selects Single-Ended or Push-Pull OperationInternal Circuitry Prohibits Double Pulse at Either OutputVariable Dead Time Provides Control Over Total RangeWhat is PWM IC?The TL494 fixed frequency PWM Controller can be used for DC to DC conversion regardless of buck or boost topology. ... This IC feature an output control circuit, a flip flop, a dead time comparator, two different error amplifiers, a 5V reference voltage, an oscillator, and a PWM comparator.How does PWM IC work?As its name suggests, pulse width modulation speed control works by driving the motor with a series of “ON-OFF” pulses and varying the duty cycle, the fraction of time that the output voltage is “ON” compared to when it is “OFF”, of the pulses while keeping the frequency constant.Which IC is better for a buck converter, TL494 or UC3843?They mainly differ in type of control…TL494 => voltage mode control (One loop control) ….while UC3843 uses current mode control (Nested loop control, with a inner/fast current loop and another outer/slower voltage loop)…Typically voltage mode are used in multiple output converters with good cross-regulation. Current mode when you want to parallel multiple converters to make a single converter with higher current rating…TL494 is a very popular IC. If you have simple requirements… TL494 is recommended…How do I properly set the feedback pin on a TL494 SMPS IC?The feedback pin is the output of both error amplifiers, used in comparing and adjusting the output pulse width to the DC control voltage.On various circuits I have looked up, the op-amp connected to pins 2 & 3 are used to set the gain of the feedback loop, using 2 resistors with one resistor connecting to 2.5V potential divider on 5V reference voltage. With the other connecting to the output (via suitable isolation)The gain appears to be set at 101, using a 51k feedback with 510 ohms to the 2.5V reference. It is used to control the gain of the feedback voltage. No literature I have yet found, gives an indication on how this gain be set, except a graph showing an open loop gain of 1000, presumably the gain is set for the best stability, although there will also be a time constant.Why is there no frequency compensation required in TI's TL494 example buck regulator design (operational amplifier, buck phase, shift phase, margin, TL494, electronics)?It's a fixed frequency PWM controller with internal dead time timer. Frequency compensation is not required. Take a look at the datasheet.How to use TL494? 

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.