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Original question:

UCC21550: Using UCC21550 as a full-bridge gate driver

UCC21550: Gate driver bias supplies

Mohammed Khan
Intellectual 570 points
Part Number: UCC21550

Tool/software:

Part numbers: UCC21550C

Team I want to understand whether we can bias gate driver VSS directly to -4V. I have bipolar supplies, +18V to VDDA. -4V TO vssa. I want swing my Vgs from +18V to -4V for SIC MOSFETs. It's a half bridge configuration. Below is the link provided application circuit for -4V bias supply. As per datasheet specs max vSs can go is -0.3V. based on reading datasheets what I have understood is if we have negative supply, we need to use 

Ucc5350EC. Please guide.

 3652.Negative Voltage.pptx

www.ti.com/.../tidrxr2b.pdf

2. One more application circuit is given below.

Can I connect Va+ to 18V, Va- to -4V ??

  • 0
    TI__Mastermind 22766 points

    Hi Mohammed,

    Yes, you can connect 18V to VDD and -4V to VSS with respect to the source of the driven FET. This is one key benefit of using an isolated gate driver, that you can easily add a negative turn-off, since the power supply is floating. There are not internal paths back to the input that can be damaged, as in a non-isolated gate driver. 

    Best regards,

    Sean