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Hello, I want to design a wide-range input flyback switching power supply with 120-1350VDC input, 24V output, and 40W output power, referring to the circuit in PMP41009. I would like you to recommend a flyback control chip similar to the UCC28740 chip, with a maximum operating frequency of up to 130KHz. Is there a suitable one?
Hello, I have another question. The chip I selected for the flyback circuit I designed has a built-in high-voltage startup circuit, so there is no need for an external high-voltage startup circuit to provide the initial voltage. The MOSFET I use is a SiC MOSFET, so I added a UCC5350M driver chip to the drive circuit. The chip pins VCC1 and VCC2 are connected to the auxiliary winding. Since the auxiliary winding only starts up after the circuit works normally, I am worried that the driver chip may not function in time, causing the circuit to fail to work properly. Will this situation occur?
