The Kynix Components

IC GATE AND 4CH 2-INP 14DIPThe SN74LS08N is a quadruple 2-input Positive-AND Gate with LS technology and four independent 2-input AND gates. The SN7408 is characterized for catalogue operation. CatalogProduct OverviewCAD ModelSN74LS08N Pinout74LS08 Pin configurationFeaturesProduct Attributes74LS08 EquivalentsWhere to Use 74LS08 IC ?How to Use 74LS08 IC ?Applications74LS08 DatasheetFAQ Product Overview74LS08 IC is a member of 74XXYY IC series. There are four AND gates in the chip and each gate have two inputs, hence the name QUADRUPLE 2- INPUT AND GATE. The gates in the chip are designed by SCHOTTKY TRANSISTORS for high speed logic operation.  SN74LS08 | AND gate IC 7408 explanation with truth table | Two input AND gate  CAD ModelCAD Model  SN74LS08N PinoutSN74LS08N Pinout  74LS08 Pin configurationPin NumberDescriptionAND GATE 11A1-INPUT1 of GATE 12B1-INPUT2 of GATE 13Y1-OUTPUT of GATE1AND GATE 24A2-INPUT1 of GATE 25B2-INPUT2 of GATE 26Y2-OUTPUT of GATE2AND GATE 39A3-INPUT1 of GATE 310B3-INPUT2 of GATE 38Y3-OUTPUT of GATE3AND GATE 412A4-INPUT1 of GATE 413B4-INPUT2 of GATE 411Y4-OUTPUT of GATE4SHARED TERMINALS7GND- Connected to ground14VCC-Connected to positive voltage to provide power to all four gates Features Operating voltage range: +4.75 to +5.25VRecommended operating voltage: +5VMaximum supply voltage:7VMaximum current allowed to draw through each gate output: 8mATTL outputsLow power consumptionTypical Rise Time: 18nsTypical Fall Time: 18nsOperating temperature:0°C  to 70°CStorage Temperature: -65°C  to 150°C Product AttributesTYPEDESCRIPTIONCategoryIntegrated Circuits (ICs) Logic - Gates and InvertersMfrTexas InstrumentsSeries74LSPackageTubePart StatusActiveLogic TypeAND GateNumber of Circuits4Number of Inputs2Features-Voltage - Supply4.75V ~ 5.25VCurrent - Output High, Low400A, 8mALogic Level - Low0.8VLogic Level - High2VMax Propagation Delay @ V, Max CL20ns @ 5V, 15pFOperating Temperature0C ~ 70CMounting TypeThrough HoleSupplier Device Package14-PDIPPackage / Case14-DIP (0.300", 7.62mm)Base Product Number74LS08 74LS08 Equivalents SN54LS08, IC 7408, HEF4081, Any two transistors can be reconfigured to form a AND gate. Where to Use 74LS08 IC ?The IC 74LS08 has a wide range of applications. A few examples are listed below.The chip is primarily used where AND logic operations are required. The chip contains four AND gates, and we can use one or all of them at the same time. The chip is used in systems that require both high speed and operation. As previously stated, the gates in the chip are designed by SCHOTTKY TRANSISTORS to reduce gate switching delays. As a result, the chip can perform high-speed AND operations. The 74LS08 is one of the most affordable AND logic ICs on the market. It is extremely popular and widely available. TTL outputs are provided by the chip, which are required in some systems.  How to Use 74LS08 IC ?The four AND gates in the chip mentioned earlier are connected internally as shown in diagram below. four AND gates Each AND gate here performs AND operation for two logic inputs. For example gate1 performs AND operation between A1 and B1 and provides output at Y1 terminal.  The truth table of AND gate is given as,Input1Input2AND OutputLOWLOWLOWHIGHLOWLOWLOWHIGHLOWHIGHHIGHHIGH A simple AND gate application circuit application circuit For better understanding the internal working let us consider the simplified internal circuit of AND gate as shown below.  internal circuit of ANDTwo transistors are connected in series to form an AND gate in the circuit. The AND gate's two inputs are driven out by the bases of the two transistors. These two inputs are linked to buttons, which change the logic of the inputs. The voltage across resistor R1 is the AND gate's output. This output is routed through a current limiting resistor R2 to an LED D1. This LED is connected to detect the output state. ApplicationsGeneral purpose ANDlogic operationMeasuring InstrumentsDigital ElectronicsServersALUsMemory unitsNetworkingDigital systemsDimensions 74LS08 Datasheet74LS08 DatasheetFAQWhat is one of the most affordable AND logic ICs on the market?IC 74LS08 How many AND gates does the IC 74LS08 have?Four What can the gates in the IC 74LS08 perform?High-speed AND operations What outputs are provided by the 74LS08?TTL outputs

DescriptionDS18B20 is a temperature sensor of Maxim. The single-chip microcomputer can communicate with DS18B20 through 1-Wire protocol and finally read the temperature. The hardware interface of the 1-Wire bus is very simple, just connect the data pin of DS18B20 to an IO port of the microcontroller.This Video Introduces DS18B20 with DatasheetCatalogDescriptionDocument and MediaDS18B20 PinoutParametersAdvantageFeaturesApplicationsDS18B20 Circuit SchematicDS18B20 Temperature Sensor DataDS18B20 Block DiagramHow to use the DS18B20 SensorWhere to use DS18B20 SensorProduct ManufacturerFAQOrdering & QuantityDocument and MediaComponent Datasheet DS18B20 DatasheetDS18B20 PinoutPinNameFunctionSOμSOPTO-921, 2, 6, 7, 82, 3, 5, 6, 7-N.C.No Connection383VDDOptional VDD. VDD must be grounded for operation in parasite power mode.412DQData Input/Output. Open-drain 1-Wire interface pin. Also provides power to thedevice when used in parasite power mode (see the Powering the DS18B20 section.)541GNDGroundParametersAccuracy (±°C)0.5ChannelsOneInterface1-WireMulti DroppableYesOper. Temp. (°C)-55 to +125Package/PinsSOIC (N)/8, TO92/3, UMAX/8Parasite Pwr.YesPart NumberDS18B20Sensor TypeLocalTemp. Resolution (bits)9, 10, 11, 12Temp. Thresh.Programmable (NV)AdvantageThe DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18B20 communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. In addition, the DS18B20 can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply.Each DS18B20 has a unique 64-bit serial code, which allows multiple DS18B20s to function on the same 1-Wire bus. Thus, it is simple to use one microprocessor to control many DS18B20s distributed over a large area. Applications that can benefit from this feature include HVAC environmental controls, temperature monitoring systems inside buildings, equipment, or machinery, and process monitoring and control systems.FeaturesUnique 1-Wire® Interface Requires Only One Port Pin for CommunicationReduce Component Count with Integrated Temperature Sensor and EEPROMMeasures Temperatures from -55°C to +125°C (-67°F to +257°F)±0.5°C Accuracy from -10°C to +85°CProgrammable Resolution from 9 Bits to 12 BitsNo External Components RequiredParasitic Power Mode Requires Only 2 Pins for Operation (DQ and GND)Simplifies Distributed Temperature-Sensing Applications with Multidrop CapabilityEach Device Has a Unique 64-Bit Serial Code Stored in On-Board ROMFlexible User-Definable Nonvolatile (NV) Alarm Settings with Alarm Search Command Identifies Devices with Temperatures Outside Programmed LimitsAvailable in 8-Pin SO (150 mils), 8-Pin µSOP, and 3-Pin TO-92 PackagesApplicationsConsumer ProductsIndustrial SystemsThermally Sensitive SystemsThermometersThermostatic ControlsDS18B20 Circuit Schematic　　DS18B20 Temperature Sensor DataDS18B20 can achieve the highest 12-bit temperature storage value through programming. The temperature storage value is stored in the register in a complement format.There are 2 bytes in total, LSB is the low byte and MSB is the high byte. Among them, MSb is the high bit of the byte, and LSb is the low bit of the byte. For binary numbers, the meaning of the temperature represented by each of them is expressed. Among them, S represents the sign bit, and the lower 11 bits are all powers of 2, which are used to represent the final temperature.The temperature measurement range of DS18B20 is from -55 degrees to +125 degrees. The manifestation of temperature data has positive and negative temperatures. Each number in the register is distributed like the scale of a caliper.　The lowest bit of the binary number changes 1, which represents the mapping relationship of a temperature change of 0.0625 degrees.When the temperature is 0 ℃, the corresponding hexadecimal number is 0x0000.When the temperature is 125 ℃, the corresponding hexadecimal number is 0x07D0.When the temperature is minus 55 ℃, the corresponding hexadecimal number is 0xFC90.Conversely, when the number is 0x0001, the temperature is 0.0625 ℃.DS18B20 Block Diagram　How to use the DS18B20 SensorThe sensor works with the method of 1-Wire communication. It requires only the data pin connected to the microcontroller with a pull up resistor and the other two pins are used for power as shown below.The pull-up resistor is used to keep the line in high state when the bus is not in use. The temperature value measured by the sensor will be stored in a 2-byte register inside the sensor. This data can be read by the using the 1- wire method by sending in a sequence of data. There are two types of commands that are to be sent to read the values, one is a ROM command and the other is function command. The address value of each ROM memory along with the sequence is given in the datasheet below. You have to read through it to understand how to communicate with the sensor.If you are planning to interface it with Arduino, then you need not worry about all these. You can develop the readily available library and use the in-built functions to access the data.Where to use DS18B20 SensorThe DS18B20 is a 1-wire programmable Temperature sensor from maxim integrated. It is widely used to measure temperature in hard environments like in chemical solutions, mines or soil etc. The constriction of the sensor is rugged and also can be purchased with a waterproof option making the mounting process easy. It can measure a wide range of temperature from -55°C to +125° with a decent accuracy of ±5°C. Each sensor has a unique address and requires only one pin of the MCU to transfer data so it a very good choice for measuring temperature at multiple points without compromising much of your digital pins on the microcontroller.Product ManufacturerMaxim Integrated provides ease of design, and speeds time to market, through analog integration. The company's analog ICs offer extra features and functionality carefully designed to streamline circuit and simplify design. Look to Maxim for solutions for consumer electronics, personal computers and peripherals, mobile devices, wireless and fiber communications, test equipment, instrumentation, video displays, and automotive applications. Maxim’s analog and mixed-signal solutions include data converters, interface circuits, power, RF wireless circuits, clocks and oscillators, microcontrollers (MCUs), operational amplifiers (op amps), and sensors.FAQWhat is DS18B20 temperature sensor?The DS18B20 is a 1-wire programmable temperature sensor from maxim integrated. It is widely used to measure temperature in hard environments like in chemical solutions, mines or soil etc. The constriction of the sensor is rugged and also can be purchased with a waterproof option making the mounting process easy.How does the DS18B20 work?It works on the principle of direct conversion of temperature into a digital value. Is DS18B20 a thermistor?A thermistor is a thermal resistor - a resistor that changes its resistance with temperature. ... Thermistors have some benefits over other kinds of temperature sensors such as analog output chips (LM35/TMP36 ) or digital temperature sensor chips (DS18B20) or thermocouples.How accurate is DS18B20?The DS18B20 reads with an accuracy of ±0.5°C from -10°C to +85°C and ±2°C accuracy from -55°C to +125°C.What is ds1820?The DS18B20 is one type of temperature sensor and it supplies 9-bit to 12-bit readings of temperature. ... The communication of this sensor can be done through a one-wire bus protocol which uses one data line to communicate with an inner microprocessor.How do I connect my DS18B20 to my Raspberry Pi?Once you've connected the DS18B20, power up your Pi and log in, then follow these steps to enable the One-Wire interface:1.At the command prompt, enter sudo nano /boot/config.txt , then add this to the bottom of the file:2.dtoverlay=w1-gpio.3.Exit Nano, and reboot the Pi with sudo reboot.What is the working principle of DS18B20?The DS18B20 Digital Thermometer provides 9 to 12-bit (configurable) temperature readings which indicate the temperature of the device. It communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. In addition it can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply.The core functionality of the DS18B20 is its direct-to-digital temperature sensor. The resolution of the temperature sensor is user-configurable to 9, 10, 11, or 12 bits, corresponding to increments of 0.5°C, 0.25°C, 0.125°C, and 0.0625°C, respectively. The default resolution at power-up is 12-bit.Where to use DS18B20 Sensor?The DS18B20 is a 1-wire programmable Temperature sensor from maxim integrated. It is widely used to measure temperature in hard environments like in chemical solutions, mines or soil etc. The constriction of the sensor is rugged and also can be purchased with a waterproof option making the mounting process easy. It can measure a wide range of temperature from -55°C to +125° with a decent accuracy of ±5°C. Each sensor has a unique address and requires only one pin of the MCU to transfer data so it a very good choice for measuring temperature at multiple points without compromising much of your digital pins on the microcontroller.How connect DS18B20 to Arduino?First plug the sensor on the breadboard the connect its pins to the Arduino using the jumpers in the following order: pin 1 to GND; pin 2 to any digital pin (pin 2 in our case); pin 3 to +5V or +3.3V, at the end put the pull-up resistor.On an ATMega328P, why is a DS18B20 temperature sensor returning incorrect temperature values?Several possibilities:1. If it is just reading a little high, it might be caused by “self heating”. Add a heat sink and/or make measurements less frequently.2. Especially if the values are really whacky, it might be code with errors or mis-wiring. Use a published sketch to check operation.3. The DS18B20 might be defective. Try another.4. It’s accurate to 0.5ºC.

TDA2030 DescriptionThe TDA2030 is a monolithic integrated circuit in Pentawatt® package, intended for use as a low-frequency class AB amplifier. Typically it provides 14W output power (d = 0.5%) at 14V/4Ω; at ± 14V or 28V, the guaranteed output power is 12W on a 4Ω load and 8W on an 8Ω (DIN45500).The TDA2030 provides high output current and has very low harmonic and cross-over distortion. Further, the device incorporates an original (and patented) short circuit protection system comprising an arrangement for automatically limiting the dissipated power so as to keep the working point of the output transistors within their safe operating area. A conventional thermal shut-down system is also included.                                                How To Make High Power Amplifier Using TDA2030 / DC 12v (English Subtitle)CatalogTDA2030 DescriptionTDA2030 Pin ConfigurationsTDA2030 Functional Block DiagramTDA2030 Package OutlineTDA2030 FeaturesTDA2030 Functional EquivalentsTDA2030 Popularity by RegionTDA2030 ApplicationsWhere to Use TDA2030?How to Use TDA2030?Product ManufacturerComponent DatasheetFAQOrdering & QuantityTDA2030 Pin ConfigurationsPin NumberPin NameDescription1Non – Inverting InputNon-inverting end (+) of Amplifier2Inverting InputInverting end (-) of Amplifier3Vs (Ground)Connect to the ground of the circuit4OutputThis pin outputs the amplified signal5Vs (Power)Supply voltage, Minimum 6V and Maximum 36VTDA2030 Functional Block DiagramTDA2030 Package OutlineMechanical Data:TDA2030 FeaturesFew external componentsMinimal boot impactLow-frequency class AB amplifier, most suitable for audio amplificationCan provide up to 20 watts of output powerWide range power supply from 6V to 36VCan provide short circuit and thermal protectionBreadboard friendlyAvailable in 5-pin TO220 packageTDA2030 Functional EquivalentsTDA2030 Popularity by RegionTDA2030 Applications For audio signal amplificationSuitable for high power amplificationAble to run on dual/split power suppliesCan be used to cascade audio speakersWhere to use TDA2030?The TDA2030 is a powerful audio amplifier IC. An audio amplifier is nothing but one that has the capability to amplify the audio signals from any audio source such as mobile phone jack or microphone so that volume is increased when the audio is played in a speaker. Audio amplifier circuits can also be made using simple op-amps, but if you need the higher volume that is loud enough for a room then this power audio amplifier is will be the best choice. This IC can deliver up to 20W of output power, so you can run a 4Ω speaker at 12W or an 8Ω speaker at 8W.How to use TDA2030?The TDA2030 is breadboard friendly and hence can be easily tested using a breadboard. The TDA2030A datasheet given in the paper consists of some basic circuits which can be used to make this IC work. I have also given a very basic circuit below.The IC can wither work on dual power supply or single mode power supply, to keep this simple I have preferred single-mode supply by using a 9V battery. The 5th pin (Vs) is connected to the positive terminal of the battery and the 3rd pin (Ground) is connected to the negative terminal of the battery. This IC is a power amplifier IC and hence requires a decent amount of current to operate, hence make sure your battery can source enough current. The resistor R1 and R2 form a potential divider across the pins 4 and 2. The two diodes D1 and D2 are used to protect the IC from reverse currents. The speaker LS1 can be any ordinary speaker of value 4Ω, 6Ω or 8Ω. The audio source C2(1) can be any audio source from a mobile jack or even a microphone. Just connect the positive point to C2(1) and ground the other point. Also, note that this amplifier can amplify only mono channel sound signals. So if you have two audio wires for left and right channel combine them both to make it as a single channel.Product ManufacturerThe STMicroelectronics (SGS-THOMSON, ST) group was established in 1987 by the merger of SGS Microelectronics in Italy and Thomson Semiconductor in France. In May 1998, SGS-THOMSON Microelectronics changed its company name to STMicroelectronics Co., Ltd. STMicroelectronics is one of the world’s largest semiconductor companies. It aims to be the market leader in multimedia application integration and power solutions. STMicroelectronics has the world’s most powerful product lineup, including dedicated products with high intellectual property rights. Products, there are also innovative products in many fields, such as discrete devices, high-performance microcontrollers, security smart card chips, and micro-electromechanical systems (MEMS) devices. In demanding applications such as mobile multimedia, set-top boxes and computer peripherals, STMicroelectronics is a pioneer in the development of complex ICs using platform-based design methods, and continues to improve this design method. STMicroelectronics has a well-balanced product portfolio that can meet the needs of all microelectronics users. Global strategic customers’ system-on-chip (SoC) projects all designate STMicroelectronics as the preferred partner. At the same time, the company also provides full support for local companies to meet local customers’ needs for general-purpose devices and solutions.Component DatasheetTDA2030 DatasheetFAQWhat is TDA2030?The TDA2030 is a monolithic integrated circuit in the Pentawatt® package, intended for use as a low frequency class-AB amplifier. Typically it provides 14 W output power (d = 0.5%) at 14 V/4 Ω. The TDA2030 provides high output current and has very low harmonic and crossover distortion. What is the difference between TDA2030 and TDA2050?Only difference is TDA2050 can take a bit higher Voltage supply: = max 2x25VDC, rekommended 2x18-22VDC. And that TDA2050 can have more watt power output (more current out) and less distortion than TDA2030. Can I replace UTC2030 with TDA2030?Although both are pin compatible and application circuit is also same, UTC2030 is slightly higher rated, 18W output vs 14W of TDA2030. Even max operating voltage of UTC2030(20V) is slightly higher than TDA2030 (18V). If you are trying to replace TDA2030 with UTC2030, it will work.

I DescriptionThis blog has designed a step-down DC switching power supply (its voltage can be adjusted from 0V) for neutron tube storage. The power supply adopts the BUCK topology, and the rail-to-rail LMV358 operational amplifier voltage feedback circuit is designed to cooperate with the LM2596 internal error amplifier to overcome the shortcomings that the minimum output voltage of the LM2596 step-down chip cannot be lower than 1.2V, thereby the output voltage can be adjusted from 0V.This video reviews an LM2596 DC to DC, adjustable, step down regualtor CatalogI DescriptionII IntroductionIII LM2596 Basic CircuitIV Design of Zero-starting Peripheral Circuit4.1 Voltage Reference Circuit4.2 Voltage Feedback CircuitV Power Inductor ParameterVI Analysis of Experimental ResultsVII ConclusionFAQOrdering & QuantityII IntroductionBefore we start reading this blog, please take a few seconds to look at the following two questions:① What is the neutron tube storage?② What is the relationship between the neutron tube storage and the DC power supply that requires the voltage can be adjusted from 0V?Figure 1. LM2596What is the neutron tube storage?Neutron tube storage is generally composed of powder with strong hydrogen absorption capacity and heating wire, used to store deuterium and tritium gas for the nuclear fusion reaction. By controlling the current of the heating wire, the outgassing volume of the reservoir and the air pressure in the tube are indirectly controlled, thereby controlling the neutron yield. The cold resistance of the reservoir is about 3Ω. When the passing current reaches 0.35A, the reservoir starts to release deuterium and tritium gas. The addition of the ion source voltage will ionize the gas in the ion source, and the acceleration high voltage will cause the ionized deuterium-tritium ions in the ion source to be extracted and accelerated, and a deuterium-tritium fusion reaction occurs on the target to produce neutrons.What is the relationship between the neutron tube storage and the DC power supply that requires the voltage can be adjusted from 0V?In order to accurately control the heating current of the storage, the power supply of the neutron tube storage requires that the voltage can be adjusted from 0V.After we took a quick look at one of the circuit protagonists, neutron tube storage, discussed in this blog, let's take a look at another equally important role: the LM2596 chip. The voltage reference of the LM2596 integrated voltage error amplifier is 1.2V so that its lowest output voltage is not less than 1.2V.Does it seem that the LM2596 chip itself cannot be adjusted from 0V? How can this defect be resolved?We can use the rail-to-rail op amp LMV358  powered by a single power supply to design the voltage feedback circuit. By isolating the sampling terminal and the feedback terminal, the linear adjustment interval of the op amp can be used to compensate for the variation of the feedback voltage, which can solve the problem of the lowest output of LM2596 that cannot be lower than the problem caused by 1.2V.After experimental tests, the design of the power supply feedback circuit is simple and efficient. Not only the power output voltage can be adjusted from zero, but also the output voltage adjustment accuracy is high, so the actual application needs can also be solved.III LM2596 Basic CircuitLM2596 is available in fixed and adjustable versions. Among them, the output voltage of the adjustable version ranges from 1.2v to 37V, with the maximum input voltage does not exceed 45V. Under load conditions, the circuit shows the following characteristics:Voltage regulation ±4%.Do not need too many components for peripheral circuits.Low power bypass mode.The typical static current is 80 μ A.LM2596 minimum output voltage 1.2V application circuit is shown in Figure 2. As can be seen from Figure 1, the feedback resistors R1 and R2 determine the voltage divider ratio of the power supply output voltage, which can be adjusted by adjusting R1. When R1 is adjusted to 0 Ω, the output voltage is the minimum, which is the internal voltage reference of the LM2596 chip.Figure 2. LM2596 Basic CircuitThe internal voltage reference at the feedback end of the LM2596 chip is 1.2V, which limits the output voltage of the power supply to be adjusted from zero.IV Design of Zero-starting Peripheral CircuitFirst, try to connect the FB terminal and the Vs terminal in Figure 1, and adjust the R1 resistance to 0Ω. At this time, the Vout is at least 1.2V. What should we do to achieve the purpose of adjusting from zero? We can disconnect Vs, design an independent voltage feedback circuit to adjust the FB terminal voltage, and change the error variation of the LM2596 internal voltage error amplifier through the external input voltage to increase or decrease the  PWM  output duty cycle, which in turn enables the output voltage to be adjusted from zero.4.1 Voltage Reference CircuitSo, how to ensure that the FB terminal voltage of U1 is around 1.2V? Since the sampling voltage feedback terminal needs a voltage regulator for compensation, we can use a simplified circuit design method, that is, using TL431 to achieve this goal. What is TL431?  TL431 has the following characteristics:TL431 is a typical three-terminal precision voltage regulatorThe output voltage from 2.5 to 36V can be arbitrarily set with 2 resistorsIts dynamic impedance is 0.2ΩThe accuracy of the voltage reference is 0.6%The voltage reference circuit based on TL431 is shown in Figure3.Figure 3.  TL431 Voltage Reference CircuitIn this circuit, the voltage reference has two functions: it can both be used as the external input voltage reference and the compensation voltage of op amp in phase. The external input voltage is used to change the output voltage, while the compensation voltage is used to compensate for the change in voltage at the feedback terminal.4.2 Voltage Feedback CircuitThe non-inverting end of U1's internal voltage error amplifier  is integrated with a 1.2V voltage reference and the output voltage feedback resistor R2 is connected to the inverting end of the error amplifier  :When the voltage at the feedback terminal is greater than 1.2V, the error amplifier  generates a negative error signal, the  PWM output duty cycle decreases, and the output voltage decreases;When the voltage at the feedback terminal is less than 1.2V, the error amplifier generates a positive error signal, the PWM output duty cycle increases, and the output voltage increases.Regardless of whether the output voltage of the power supply becomes larger or smaller, the chip can keep the output voltage stable by controlling the on time of the switch tube, but the minimum output voltage is 1.2V.The voltage feedback circuit designed by LMV358 is shown in Figure 4. Figure 4.  LMV358 Voltage Feedback CircuitHere is a question: What is the key to realizing the output voltage adjustment from zero? In fact, it is very simple. The key is whether the lowest voltage of FB in the operational amplifier feedback circuit can be 0V. In the case of a single power supply, the op amp has integrated transistors, and its minimum output voltage is about 0.6V (which obviously does not meet the above requirements). If we want to solve this problem, we can choose LMV358 op amp powered by the rail-to-rail single power supply, with a minimum output voltage of 65mV, so as to meet the requirement of power adjustment from zero.make:M=R14/R13N=R16/(R16+R18)Q=R19/R20Then the voltage feedback circuit parameters are calculated as follows:                                                                               (1)  Vo1=Vs                                                                                   (2)  Vo2=(1+M)×Vref-Vad×M                                                                                  (3)  Vo3=N×(Vo1+Vo2)×(1+Q)                                                                                      (4)  Vo4=k×Vo3=Vfb      In the above formula:k is a variable coefficient.Let FB=1.2V. When the power is initially powered on, Vad=0V, Vref=2.5V, but the output voltage of the operational amplifier does not necessarily meet FB=1.2V, causing LM2596 to malfunction. In order to avoid this situation, we can use R21 to correct the voltage value of Vfb at the initial power-on, so that FB=1.2V.Increase the Vad terminal voltage, the Vo2 terminal voltage decreases and the output voltage increases, so that Vo1 increases. Conversely, Vo2 compensates the variation of Vo1 to ensure that the voltage at the feedback terminal of the chip is equal to 1.2V, so that the sampling voltage Vs follows the change of the Vad voltage, and the power supply can be adjusted from zero.The test data of the voltage feedback circuit is shown in Table 1.Table 1. Test DataFrom the above test data, we can see that we can make use of the linear output characteristics of the operational amplifier to achieve the purpose of linear adjustment of the output voltage. The Vs changes with the Vad, the chip reference terminal voltage Vfb remains unchanged, and the output voltage range is determined by the resistance partial voltage ratio. Under the condition of full load,  when the Vad input voltage changes from 0 to 5V, the sampling resistor Vs terminal voltage output range can be 0 to 5V, and the power supply output voltage is adjustable from 0 to 35V through the resistor divider ratio.V Power Inductor ParameterThere are 3 operating modes for the inductor current in the BUCK circuit. This blog designs the inductor according to the CCM working state, and fine-tunes the inductor parameters according to the actual test results. When the power tube is turned on, the inductor current rises linearly, and the current increment expression is:(5)  ΔION=(VON×TON)/L      VON, TON, and L are the inductor conduction voltage, turn-on time and inductance, respectively. The current decrement in the turn-off phase of the power tube can be expressed as:(6)  ΔIOFF=(VOFF×TOFF)/L       VOFF and TOFF are the inductor voltage and turn-off time when turn-off. In a switching cycle, the increment and decrement of the inductor current are equal, and the volt-second law can be used to obtain:(7)  VON×TON=VOFF×TOFF       In the buck topology, VON=VIN-VO, VOFF=VO, the above formula is transformed to derive the duty cycle equation of BUCK topology work:(8)  D=VO/VIN            How to determine the duty cycle? The power supply input voltage is a fixed value of 40V, and the output voltage range is 0-35V. From this, the duty cycle D=0-0.875 can be calculated. Here, we design the inductor parameters according to the principle of maximum duty cycle and maximum output power. So how is IL determined? The maximum load capacity of LM2596 is 3A. For the BUCK topology, the average inductor current IL is equal to the load current IO. We can set the current ripple rate r to be 0.3, and the choice of r affects device selection and circuit cost. The expression of r is defined as follows:(9)  r=ΔI/IL  In the above formula: ΔI is the change of the inductor current in a period, and the parameters are substituted into the above formula to obtain ΔI=0.9A.According to the law of electromagnetic induction, the inductance is calculated as the following formula:(10)  L=(VON×D)/(r×IL×f)It is known that the switching frequency of the LM2596 chip is 150kHz, and the calculated parameters are substituted into the above formula to calculate L = 259 μ H. In the actual debugging, the theoretically calculated inductance parameters can not meet the practical application requirements. According to the actual debugging results, the high frequency power inductor with rated input current 4A and inductance value 330 μ H is selected.VI Analysis of Experimental ResultsMake a prototype according to the design parameters. Under the condition of full load, given 40V input voltage, the output voltage of the power supply under different input voltage is measured by adjusting the external Vad voltage. Table 2 shows the output voltage test data at load 10.1 Ω. In practical application, the efficiency of the power supply is the first concern. Table 3 shows the data for measuring voltage and current at the input and output of the power supply, respectively. As can be seen from tables 2 and 3, the input and output voltages are proportional to each other, and the regulation accuracy of the output voltage is about 0.05V. The output voltage of the power supply can be adjusted from zero, which solves the deficiency of 1.2V of the lowest output voltage of the LM2596 chip. Using the above calculation method, the average efficiency of the power supply is 93.44%. Using the test data under no-load and full-load conditions, it is calculated that the load adjustment rate of the power supply at 35V output is 1.3%. In addition, the power supply can not only work for a long time, the temperature rise is normal, but also the performance is stable.Table 2.  Test Data: LM2596 DC Regulated Power Supply  (10.1Ω) Table 3.  Test Data: LM2596 DC Regulated Power Supply Efficiency VII ConclusionIn order to solve the shortcoming that the output voltage of LM2596 cannot be adjusted from zero, this blog adopts the method of isolating the sampling voltage and the feedback end of the chip error amplifier.  That is: a voltage feedback circuit by designing a rail-to-rail op amp to make the output voltage capable of adjusting from zero. In addition, we analyzed the design of the inductance parameters of the adjustable BUCK power supply in principle, and make a prototype according to the parameters to verify the correctness and reliability of the design. The experimental results show that the load adjustment rate of the power supply is 0.88%, the maximum working efficiency under rated load is 95.08%, and the full load power is 105W, which can meet the needs of practical applications.FAQHow does a LM2596 work?The LM2596 operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 5−lead TO−220 package with several different lead bend options, and D2PAK surface mount package.What is the purpose of Neutron tube storage?Deuterium and tritium gas.What 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.

Diodes - General Purpose, Power, Switching 65V 50mA Germanium CatalogOverview1N34A CAD Model1N34A Features1N34A  Applications1N34A  Product Attributes1N34A  Product Compliance1N34A  Germanium Diode Circuit1N34A  vs 1N34ATRManufacture1N34A DatasheetFAQ OverviewThe 1N34A Germanium diode is an old standby in electronics. Widely used for detecting the rectifying efficiency or for switching on a radio, TV or stereo etc.Note: These are PN junction silicon types and NOT point contact germanium. Check the spec sheet to ensure you understand what you're buying.  Listening to free radio with your air core loop and 1N34A germanium diode 1N34A CAD Model 1N34A CAD Model 1N34A FeaturesForward voltage drop: 1V @ 5mABreakdown voltage: 65V @ 1mAReverse leakage current: 30µA @ 10V, 500µA @ 50VFlat Junction capacitanceLower leakage currentHigh mechanical strengthAt least 1 million hours MTBFOptimized for radio frequency response 1N34A  ApplicationsAM/FM detectorsRatio detectorsFM discriminatorsTV audio detectorsRF input probesTV video detectors 1N34A  Product AttributesTYPEDESCRIPTIONCategoryDiscrete Semiconductor Products Diodes - Rectifiers - SingleMfrNTE Electronics, IncSeries-PackageBagPart StatusActiveDiode TypeStandardVoltage - DC Reverse (Vr) (Max)65 VCurrent - Average Rectified (Io)50mAVoltage - Forward (Vf) (Max) @ If1 V @ 5 mASpeedSmall Signal =< 200mA (Io), Any SpeedCurrent - Reverse Leakage @ Vr500 A @ 50 VCapacitance @ Vr, F1pF @ 1V, 1MHzMounting TypeThrough HolePackage / CaseDO-204AA, DO-7, AxialSupplier Device PackageDO-7Operating Temperature - Junction75C (Max) 1N34A  Product ComplianceUSHTS:8541100080CAHTS:8541100090CNHTS:8541100000TARIC:8541100000ECCN:EAR99 1N34A  Germanium Diode Circuit  Germanium Diode Circuit  1N34A  vs 1N34ATR 1N34A1N34ATRRohs CodeNoNoPart Life Cycle CodeObsoleteObsoleteIhs ManufacturerMICRO COMMERCIAL COMPONENTS CORPCENTRAL SEMICONDUCTOR CORPPart Package CodeDO-7 Package DescriptionDO-7, 2 PIN Pin Count2 Reach Compliance CodeunknowncompliantECCN CodeEAR99EAR99HTS Code8541.10.00.708541.10.00.70Additional FeatureLOW LEAKAGE CURRENT Case ConnectionISOLATEDISOLATEDConfigurationSINGLESINGLEDiode Element MaterialGERMANIUMGERMANIUMDiode TypeRECTIFIER DIODERECTIFIER DIODEForward Voltage-Max (VF)1 V JEDEC-95 CodeDO-7DO-7JESD-30 CodeO-XALF-W2O-PALF-W2JESD-609 Codee0e0Non-rep Pk Forward Current-Max0.5 A Number of Elements11Number of Terminals22Operating Temperature-Max75 C Output Current-Max0.05 A0.05 APackage Body MaterialUNSPECIFIEDPLASTIC/EPOXYPackage ShapeROUNDROUNDPackage StyleLONG FORMLONG FORMPeak Reflow Temperature (Cel)NOT SPECIFIEDNOT SPECIFIEDQualification StatusNot QualifiedNot QualifiedRep Pk Reverse Voltage-Max65 V75 VSurface MountNONOTerminal FinishTin/Lead (Sn/Pb)TIN LEADTerminal FormWIREWIRETerminal PositionAXIALAXIALTime@Peak Reflow Temperature-Max (s)NOT SPECIFIEDNOT SPECIFIEDBase Number Matches181 DiodesRectifier DiodesDiodesRectifier Diodes ManufactureFor over 40 years, NTE Electronics, Inc. has been a leading supplier of high-quality NTE and ECG brand name electrical and electronic components. Product lines include semiconductors, relays, resistors, capacitors, cable ties and bundle management products, LED lighting, optoelectronics, potentiometers and trimmers, RF connectors, heat shrink, soldering irons, soldering stations, and heat guns, solder wick, AC/DC adapters, clips and test leads, terminals and connectors, fuses, fans, tools and hardware, wire and cable, and more. 1N34A Datasheet1N34A Datasheet FAQWhat is a 1n34 diode?Point Contact Germanium Diode. Description: The 1N34A is a point contact diode in a DO7 type package employing N-form Germanium and gives an efficient and excellent linearity when used in TV image detection, FM detection, radio AM detection, etc. What is 1N4001 diode used for?The 1N400x (or 1N4001 or 1N4000) series is a family of popular one-ampere general-purpose silicon rectifier diodes commonly used in AC adapters for common household appliances. Its blocking voltage varies from 50 volts (1N4001) to 1000 volts (1N4007). What is the most common diode?The most commonly used signal diode is the 1N4148. This diode has a close brother called 1N914 that can be used in its place if you can't find a 1N4148. This diode has a forward-voltage drop of 0.7 and a peak inverse voltage of 100 V, and can carry a maximum of 200 mA of current. What is a 1N34A diode used for in a radio?1N34A diodes are made of a material called germanium a material used for transistors and diodes as one of the first semiconductor materials used commercially. What does a germanium diode do?Germanium diodes are used as the solar cells responsible for absorbing the IR light and converting it into electricity. What is the difference between germanium diode and silicon diode?A Silicon Diode is a semiconductor that has both positive and negative charge polarity and can allow an electrical current to flow in one direction whilst restricting another. A Germanium Diode works in the same way but has a low forward voltage which results in it being a low power loss and an efficient diode.

2N3055 is a general purpose NPN power transistor manufactured with the epitaxial base process, mounted in a hermetically sealed metal case, which  designed for general-purpose switching and amplifier applications.  2N3055 is preferred when you want a simple switching device for medium power loads. 2N3055 is one of the basic transistors available in the market for cheap and with features being suited for many applications. 2N3055 is also used in audio power amplifiers. The device has good amplifying factor and also the gain is almost linear making 2N3055 one of best solution for power amplifiers.Using 2N3055 making an easy inverter circuit which can operate your led light, charge your mobile, fan, lcd, led, etc.Catalog2N3055 Pin Configuration and Functions2N3055 Features2N3055 Applications2N3055 PackageHow to Use 2N3055 Transistor2N3055 CAD Models2N3055 Functional Equivalents2N3055 Popularity by Region2N3055 Market Price Analysis2N3055 ManufacturerComponent DatasheetOrdering & Quantity2N3055 Pin Configuration and Functions Like any other transistor 2N3055 has three pins namely EMITTER, BASE and COLLECTOR. The pin configuration of 2N3055 is given below. Pin NumberPin NameDescription1Base (B)Normally used as trigger to turn ON  the transistor2Emitter (E)Normally connected to GROUNDTAB or CASECollector (C)Normally connected to LOAD2N3055 FeaturesDC Current Gain − hFE = 20−70 @ IC = 4 AdcCollector−Emitter Saturation Voltage − VCE(sat) = 1.1 Vdc (Max) @ IC = 4 AdcExcellent Safe Operating AreaPb−Free Packages are Available*2N3055 ApplicationsPower switching circuitsAmplifier circuitsPWM applicationsRegulator circuitsSwitch mode power supplySignal Amplifiers2N3055 PackageHow to Use 2N3055 TransistorAs mentioned earlier the 2N3055 can be used for any NPN transistor applications but for understanding the functioning of device let us consider a simple application circuit as shown below. Here we are going to use 2N3055 as a simple switching device to drive a motor and is in common emitter configuration.As show in circuit we are using a motor as the load and the gate signal for turning ON the transistor is provided by 5V source with button being the triggering device. The trigger source and power source must share a common ground for the circuit to work. The 100Ω resistor is provided for limiting the current through base. Under initial conditions the button will be open and no current flows through the base of transistor. With no base current the transistor acts as open circuit and the entire supply voltage V1 will appears across it. When the button is pressed at certain time, the voltage V2 forms a closed loop with base-emitter of transistor as can be seen in circuit diagram. With this closed loop a current flows through base of transistor and with base current flow the transistor gets turned ON. Having transistor acting as short circuit in ON state there will be collector current which flows through motor making it rotate. This motor will keep rotating until there will be base current. After a certain time when the button is released the base current becomes zero and the transistor gets turned OFF. With transistor going to high resistance state in OFF mode, the collector current also becomes zero bringing motor to stop.   The way of controlling power motor via simple push button realizes the use 2N3055 as a switching device and in the same way we can use 2N3055 in other transistor circuits.2N3055 CAD ModelsPart symbolFootprint2N3055 Functional Equivalents2N3055 Popularity by Region2N3055 Market Price Analysis2N3055 ManufacturerON Semiconductor is driving energy efficient innovations, empowering customers to reduce global energy use. The company offers a comprehensive portfolio of energy efficient power and signal management, logic, discrete and custom solutions to help design engineers solve their unique design challenges in automotive, communications, computing, consumer, industrial, LED lighting, medical, military/aerospace and power supply applications.Component Datasheet2N3055 Datasheet