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UCC5390: Detailing of Protection features of UCC5390

Meghana R
Prodigy 30 points
Part Number: UCC5390

Hi TI Community,

I've been working on design of a 3-Phase Inverter using SiC MOSFET with UCC5390 chosen for driver. Short circuit clamping is one of the key features of the IC. I wanted to confirm whether this feature is same as Desaturation protection?. If not , can anyone please clarify how Short Circuit Clamping and Desat Protection feature differ from each other. And also how is this Short Circuit Clamping is configured within the IC.

Thanks in Advance

Meghana R

  • 0
    TI__Intellectual 2805 points
    Hello Meghana and welcome to the E2E community!

    These two features are different where UCC53x0 is a diode that clamps the output to ~1V and desat protection monitors the drain of the MOSFET and compares it to an internal reference and disables the output under the short-circuit condition.

    (Devices such as UCC53x0 family)
    Short circuit clamping protects the IC from short circuit conditions. It has a clamping diode from the output pins to VCC2 and VEE2 to the output pins.
    Under short circuit conditions, these internal diodes will clamp the pins to ~1V to protect the device. These diodes can conduct 500-mA for 10-us and 20mA continuous current.

    (Devices such as ISO585x)
    Gate drivers with desat protection detect power transistor short circuit fault when the V_DS or V_CE(IGBT) level triggers the fault condition. Upon detection, the gate driver blocks the output and initiates a soft-turnoff procedure. STO disables the OUTH pin and pulls OUTL pin to low over a time span of 2-us. When OUTL reaches 2-V above VEE2, output is pulled hard to VEE2 to turn off the IGBT.

    regards,
    Mateo
  • 0 in reply to Mateo Begue
    Prodigy 30 points
    HI Mateo,

    Thanks for the explanation. It resolved the doubt i had.


    Regards
    Meghana