Attached the pix as below . I had a question about 10Kohm !!
Should it 10kohm ? I do some testing about this value , so far if the resistor smaller during THD testing will better .
Do you have any comment for the 10k resistor design ?
Second question , it about VAC pin . We design a 1000W based on ADP1047 , During Brownout testing , In full load condition if "Vin on" and "UV Fault" is too close will get some risk . It like due to full load condition , input current is very big so the input voltage will drop in the ac line .
When we trum down the input voltage until trigger the UV fault , So the system will shuntdown (Output = no load , input current will getting small) , The input voltage no drop and getting higher . It means when brownout to in the VAC will error due to the ac line voltage drop and system will turn on ~ off ~ on ~ off until the system shuntdown and needs use pson to restart it .
We very concern this operation , Does any advise to us ???
Thanks so much ~