Hi,
I am experimenting some start-up issue. The converter won't start if a small load is connected on the output and also some times 2 start-up sequence are required to get the rated output voltage.
I have captured the startup waveforms below :
- CH1 : Voltage at Co1 (secondary resonance)
- CH2 : Not used
- CH3 : Current in primary of transformer
- CH4 :Voltage at switching node (primary)
The target output voltage is 20V and the start-up is aborted at less than 13V.
Once started, the converter behaves almost well (still having some issue between transition from ABM to AAM) and regulation is fine at full power.
Thanks for your help.
