Hi Gary,
When you change the resistor divider to switch from 5V to 9V or 15V, it changes the percentage of droop compensation that you are adding in. So, this technique does not work well for adjustable output voltages like USB-C PD.
regards,
…
After running a few simulations of your drive circuit, I think I see the problem. Notice that the way we have the drive circuit configured, the gate capacitance is always connected across the secondary of the drive transformer. After the drive signal…
Hi Jil,
The transformer for this supply was designed by Renco (contact information provided in the previous post), based on the electrical requirements. I do not know the exact number of turns used in the design, however the winding ratios are 13…
The "DRV" signal from the UCC2897A is a 12V signal. D8 clamps the signal to 5V to protect the ISO721MD. R16 limits the current from "DRV", but it also introduces a delay. C17 minimizes this delay. It is ok to use 220pF for C17.
