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UCC21220A: Isolated H-Bridge driver for a discrete GaN device (EPC2022)

Garth Niethe
Prodigy 80 points
Part Number: UCC21220A
Other Parts Discussed in Thread: LMG1205, LMG1020, LMG1210, ISO6721

Hi,

I'm looking at a 3-phase 48V, 22A peak H-bridge and want to use an EPC2022 as the transistor. I know I can use a LMG1205 etc as the driver for a non-isolated design but I need the power transistors isolated from the control signals. I was considering using the UCC21220A as an isolated driver but was unsure whether the clamping voltage is too high for the EPC devices.

Can you please advise the best way to drive isolated discreet GaN FETs with low Vg breakdown of only 6V?

thanks

Garth

  • 0
    TI__Mastermind 23155 points

    Hello Garth,

    Our expert on the UCC21220A is not in the office at the moment. He will respond to your questions shortly.

    Regards,

  • 0
    TI__Expert 4065 points

    Hi Garth,

    We don't have any isolated drivers with less than 5V UVLO. UCC21220A has a recommended min operating of 6V which would be too high, but you might get away with using this part if you implement some negative turn off. 

    Another alternative is buffering the UCC21220A outputs with a dedicated GaN driver like LMG1020. Set up two power supplies, one >6V for UCC21220A and the other <5V for LMG1210.

    Otherwise, if you need +5V/0V drive voltage, the best option would be to use the LMG1205 or LMG1210 with an external isolator, such as ISO6721.

    What level of isolation do you need? Basic or functional? Functional is isolation necessary to keep circuits functioning and Basic adds protection against electric shock.

    Thanks,

    Krystian

  • 0 in reply to Krystian Plaskota
    Prodigy 80 points

    Thanks for confirming what I already suspected. I'm looking at using an external isolator now with a LMG1210. I'm working towards 3kV of isolation.