1, the common high-power switching power supply is the half-bridge double-tap type, with the chip TL494, and the chip that can be interchangeable with TL494 is KA7500 and MB3759. Most of the power supplies of desktop computers are the half-bridge double-clicking type of TL494, and the general high-power iron box power supply is basically the same.
2, PPEC-86CA3A is used in phase-shifted full-bridge power supply topology to provide a stable and reliable isolated DC/DC control solution for power supply R&D enterprises. Pec-86ca3h is a control chip applied to LC series resonant power supply topology, providing stable and reliable isolated high voltage power supply control solution for power supply research and development enterprises. Inherit the advantages of PPEC code free programming, reduce high-power switching power chip high-voltage power supply development threshold, shorten the research and development time.
3, forward, flyback do not consider high-power switching power coreThe limit of 200w flyback, the limit of 500w forward excitation, as for whether to use half bridge or full bridge, depends on the power tube you use, if you use vmos or transistor (bjt), it must use the full bridge, because there are too few tubes with high current and high voltage, using igbt words, half bridge can be considered.
4, IR company IRS2795 (1,2) is an LLC resonant half-bridge converter control integrated circuit, the maximum operating frequency of 500kHz, the minimum minimum and maximum switching frequency, flexible start frequency and time and dead time, micro start and superLow static current, with a variety of protection circuits, not needed in LCD and PDP TVS, communication and PC switching power supplies as well as home sound systems.
1, the power management chip model table is as follows high-power switching power chip : PIC24F32KA301. PIC24F16KA301. PIC24F16KA101. PIC18F14K22. PIC18F14K50.PIC16F1829. PIC16F1509. dsPIC33FJ12MC201. PIC24F08KA101. PIC18F13K22. 1PIC18F13K50. 1PIC16F685. 1PIC16F689. 1PIC16F690.
2, the use of six-pin switching power supply chip High-power switching power supply chip , the production of switching power supply high-power switching power supply chip , you can choose OB2532The chip. OB2532 is a six-pin switching power supply chip, 1 pin is GND end, 2 pin is GATE end, 3 pin is CS end, 4 pin is INV end, 5 pin is COMP end, 6 pin is VDD end. Using this chip plus a switching power supply pulse transformer is very easy to form a switching power supply High power switching power supply chip .
3, currently commonly used high-power switching power supply chip chip: TL49TL59SG3524 and other used to drive dual-channel bipolar transistor, SG3525 for the double totem pole output can drive double MOSFET, double drive can be used to drive half bridge or full bridge type forward switching power supply, the power is generally from tens of watts to tens of kilowatts. UC384UC384UC3845 is generally used for flyback switching power supplies, the power is generally a few watts to several hundred watts.
4, single-ended flyback switching power supply common chip: UC384TL3842 can be universal; UC384TL3843 is universal; The UC384TL3845 is generic. Common chip of double-end excited switching power supply: TL49494, 75It is a single-ended output control circuit chip high-power switching power supply chip , its biggest advantage is that the external components are very few, the wiring is relatively simple, high reliability, low cost. It can be isolated from the power grid through the high-frequency transformer, and is suitable for the switching power supply that constitutes the high-power switching power chip below 100W.
2, the general DC-DC can be, but the PWM generation needs to be output from the main chip, overcurrent protection and overheat protection are integrated inside the chipSwitching power chip . Such as LM3670 or some backlight chips such as CP2123 and so on.
3, TI UCC28950: This is a chip for high-performance, low standby power consumption off-line switching power supply. It integrates a variety of protection functions, such as overvoltage protection, undervoltage protection and so on. The above are only some common switching power supply chip models, in fact, each manufacturer has its own series of switching power supply chips, and a wide range of models, the choice needs to be determined according to actual needs.