Hi all,
Decisions, decisions.... For a 48V, 2kW class polyphase buck converter (Really a two quadrant supply) for envelope tracking, what would you choose?
EPC : Has lowest Rds, but 0.45mm BGA, yuck, and bare passivated die, so delicate and likely very picky about ESD protection, I can see soldering being a pain.
GAN Systems : Nicer package to work with, but three times the Rds value, however probably much easier to heatsink and no messing with bare die BGA packages, however only do single devices, no packaged half bridge components.
TI : Integrated driver! Only 10A rated so I would need a few more phases, but the whole gate drive pain point goes away, somewhat expensive however and I worry about cooling them.
Question is, does TIs 10A rating mean it in reality, or is it like most mosfet current ratings (measured in boiling freon)?
The reason to go GAN for what would ordinarily be a mosfet job at maybe 100KHz is that this is an envelope tracker, it needs to be able to swing that output terminal around between maybe 15V and 48V at 10s of Khz rates, into a capacitive load, while having nearly no switching residual on the output, so a high frequency is indicated. I am thinking in terms of maybe a 1MHz switching frequency and 3 Phases, or a 500KHz switching frequency and 6 phases, for a 3MHz output fundamental.
Could one of the power guys with experience with these devices comment please?
Regards, Dan.