hi john
thank you for your reply
I have other issue about 28070； we set PFC output bus voltage = 410V； Vin = 288V; load = 40W two channels are interleaved in parallel；
input current come out strange wave ，
as follow pic，
Ch3： input current；
I doubt Vin is too high， then obtain the belo
Ch1：PFCVout； ch2 DRB；ch3 input current ；ch4 input voltage；
We can find Vout > Vin all the time , it explain it is not the root cause ; then we doubt output power is too low, and then we obtain the below wave;
Ch1: DRA; ch2: VAO; ch3: input current ; ch4: Vsense;
We can conclude VAO > 0.75; so it is not root cause;
One question : Vsense > 3V , GDA,GDB is prohibit ?
from pic GDA,GDB is not probit.
Two question: input wave as below pic show on which condition ?
please advise ，thank you very much ！
