saurav_sdpl
Full Member level 3
Feedback loop in smps
My flyback smps has following specifications:
Vin= Universal Range
Vout=5V@200mA
12V@250mA
My feedback controll is from 5V
At no load power supply does not make any noise and works perfectly, but when 200mA of load is applied at 5V the supply works fine but the transformer makes noise.
I havea doubt that whether the problem lies with the stability of loop or something else because if i alter feedback cap value from 470pF tp 1nF the noise reduce but still it is considerable.
What optimum vale of cap should i have in my deisgn to make the loop stable
My flyback smps has following specifications:
Vin= Universal Range
Vout=5V@200mA
12V@250mA
My feedback controll is from 5V
At no load power supply does not make any noise and works perfectly, but when 200mA of load is applied at 5V the supply works fine but the transformer makes noise.
I havea doubt that whether the problem lies with the stability of loop or something else because if i alter feedback cap value from 470pF tp 1nF the noise reduce but still it is considerable.
What optimum vale of cap should i have in my deisgn to make the loop stable