Other Parts Discussed in Thread: UCC24612
Following is a txt I sent to EPC app folks. Surely, this is something we need to get your review as well....
Seems to me it will work!...but what dya think.
But here we go: I am wondering if you can review an application in which we intend to use EPC2034( or its new incarnations), 200V device. Again, it is for a low power low switching frequency application. Reason for using GaN here is purely to avoid adding nuisance abatement circuitry or purely to obtain higher efficiency in small vol circuit.
It involves UCC28780 Active Clamp Flyback controller. The D/s has the option of using primary side GaN (LMG3410) but uses MOSFET for synchronous rectification using UCC24612 sync controller- appears only to be useful with MOSFET.
But we want to use EPC2034! In most regions, they are similar.
One clear problem is that it sends out gate drive level at VDD pin voltage if it is less than 9.5V( or something similar)
So, one way to trick the chip to give safe 5V gate drive is to provide 5.2V or so at VDD because the chip works down to 4V or so. Or do not use VDD & hook up 5V LDO output at REG pin.
See attached.
What would be your thinking on this?EPC_SYNC_UCC28780.pptx
