abhinand rd
Member level 1
Hello, I have basic question on flyback converter with multiple windings.
Spec:
Input : 12V
Output 1: 5V, 1A
Output 2: 15V, 1.5A
The feedback is provided on 5V winding.
While testing i loaded 10% on 5V winding and kept 15V open, the duty cycle was around ~9%. But when i loaded 15V winding(~50%), the duty cycle increased around 40%.
/?
So my question is how the duty cycle increased when loading increased on 15V(unregulated winding), since feedback in present only on 5V winding?
Spec:
Input : 12V
Output 1: 5V, 1A
Output 2: 15V, 1.5A
The feedback is provided on 5V winding.
While testing i loaded 10% on 5V winding and kept 15V open, the duty cycle was around ~9%. But when i loaded 15V winding(~50%), the duty cycle increased around 40%.
/?
So my question is how the duty cycle increased when loading increased on 15V(unregulated winding), since feedback in present only on 5V winding?