Hi David,
This is the schematic.It uses UCC25230 as auxiliary power conversion chip converting from 36V-72V to 9V .The problem is that the T2 second side oscillation is serious as below channel 3.
The schematic diagram is based on PMP8878 (TI reference design).How to eliminate oscillations？
Unlike the reference design, the T2 model I used was LPD5030V-224MEB whose DCR is 3.3 Ohms, while the reference design used LPD5030V-224MRB whose DCR is 5.25 Ohms.
Is the oscillation caused by a smaller DC equivalent resistance?
Regars,
Shao wei.
