This is a flyback switching power supply schematic, the control chip is UC3842. The output voltage of this power supplyThere are three levels: 5VDC, 12VDC, and -12VDC. The circuit converter is also a buck type hard switching circuit. The main winding of the transformer is isolated by a single tube drive, and CR3 can provide the primary side drain path of the transformer.
Drive switch tube: The PWM signal is reversed through the inverter and output to the drive circuit of the switch tube. The on-off and off of the switching tube control the on-off of the output circuit, so as to adjust the output voltage and current.
UC3842 can directly drive MOS tube, IGBT, etc., suitable for making 20 ~ 80W small power switchFor your problem, there are many brands of 24V switching power supplies. The main chip is 7824. And 3842. Many need to be defined by the caretaker. The specific needs to see each product model. I hope it helps. It's just an opinion.
2, the power chip is more famous Ling and LM these two, to 20A output, there are LM5116, LT3763, etc., you log in to their website, and then find the power controller in the buck type, the above list has voltage, current, price and other parameters. Personally feel that the lm power supply is not very good to adjust, the ripple is large, easy to hiccup.
3, TI UCC12050: This is a high performance, low cost current mode PWM controller for offline and DC-DC converter applications. Its features include adjustable frequency, cycle by cycle current limitation, etc. TI UCC28950: This is a chip for high performance, low standby power offline switching power supply.
4, if the output current is less than 1A, HB3106 can be used. Input voltage 75-40V, withstand voltage 45V, output voltage is adjustable. The periphery is simple.
5, LM7805 is enough,The circuit of the LM2576 switching regulator chip is slightly more complex and has ripple interference. The 34063 is a booster chip, but it can also be used as a booster chip, but it is not cost-effective. The 7805 is the cheapest, and the circuit is simple and the voltage regulation effect is good.
1, DK125 is a secondary feedback, flyback AC-DC off-line switching power supply control chip, the chip uses highly integrated CMOS powerCircuit design, with output short circuit secondary open circuit, over temperature, over voltage and other protection functions.
2, power 24W, voltage 85V-265V, etc. DK124 is an off-line switching power chip, the maximum output power reaches 24W, full voltage input 85V-265V, built-in 700V high voltage power tube, built-in 16mS soft start circuit, internal integrated PWM controller.
3, power chip 5V5A transformer. dk124 pin is an off-line switching power supply chip, the maximum output power reaches 24W, its parameter is the power chip 5V5A transformerWhen powered on, the chip charges the external VCC energy storage capacitor through a high-voltage current source internally connected to OC and VCC pins.
4, DK124 chip can not be replaced with VⅠRER22. The functional parameters of each foot are different.
5, Qualcomm Snapdragon 778G DK125 is a secondary feedback, flyback ACDC off-line switching power control chip, the chip uses highly integrated CMOS circuit design, its performance is the same as Qualcomm Snapdragon 778G, so dk125 is directly replaced by Qualcomm Snapdragon 778G.
6. The voltage range is exceeded. The dk124 power supply is unstable because the voltage range of the input switching power supply exceeds the output conditions maintained by its own converter. The dk124 is an off-line switching power chip with a maximum output power of 24W.
1, DK125 is a secondary feedback, flyback AC-DC off-line switching power supply control chip, the chip uses highly integrated CMOS circuit design, with output short circuit secondary open circuit, overtemperature, overvoltage, etcProtection function.
2, general. DK106 and DK112 can be universal, both are antibodies made by Roche Dako Denmark, but the antigens are different, DK106 is an antibody against the p16 protein, while DK112 is an antibody against the p53 protein.
3, reliability Haojou dk125s adopts high-quality parts, after strict quality inspection, to ensure reliability. In addition, Haojue dk125s also uses a variety of reliability designs, such as the use of a new engine design, so that the engine is more stable during operation, thus greatly improvingSex. DK106 is a secondary feedback, flyback AC-DC off-line switching power supply control chip. The VIPER12A is an off-line switching regulator that integrates a MOS tube at the input and uses an internal PWM regulator to achieve high efficiency conversion.
2, VIPER12A can directly replace DK106, DK106 is secondary feedback, flyback ACDC off-line switching power control chip. The chip adopts highly integrated CMOS circuit design, with output short circuit, secondary open circuit, over temperature, over voltage and other protection functions.
3, the chipIt is a dedicated low-power switching power supply control chip, and the functions of each pin are as follows: Gnd ground pin. Fb feedback control. Vcc power supply pin. The 678 Collector output pin is connected to the Collector end of the high voltage switch tube in the chip and is connected to the switching transformer.
4, dk106 power chip is good or bad judgment method: the simplest way is to measure the input and output voltage value. Set the multimeter function switch to AC voltage (manual 500V or 750V) to ensure that the input voltage is normal.