I adjusted M51957B to Vpin2 = 1.9V ( 1.28V before). FA5331 modify R7-8 = 430K. R6 = 3K. Then the circuit worked at Vin = 100Vdc. Vout = 366V but appears a little noise ~ 1.3V.
I started to try loading 3A-12A and 21A to see what happens.
The PFC circuit in this context is a PFC boost circuit for a switching power supply circuit (SMPS) 24V / 21A output Bucket behind. They are designed by manufacturers to work together.
Can any one tell me what will happen if I lower the Vout voltage of the PFC circuit lower? And if so, how low is SMPS circuit still working properly?
In this case I reduce Vin three times, For 1 bridge to divide the voltage for the parts such as voltage feedback, overvoltage protection feedback ... should I reduce the high side resistance (R7-8 440kOhm) or Will increasing low side resistance (R6 2k7) be better?
Someone passing by can help me with some clarification!
Thanks & Brgds