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ISO5451-Q1: Driving MOSFET

Shinichi Yokota
Genius 9715 points
Part Number: ISO5451-Q1
Other Parts Discussed in Thread: ISO5451

Hello,

I'm looking at the data sheet of ISO5451-Q1 before drawing a schematic, but I can't figure out exactly what need to be taken care of in order to drive MOSFET because the data sheet focuses on driving IGBT.

Could you give me advice on items a designer should keep in mind to drive MOSFET that are missed from the data sheet? One example is how to handle DESAT pin. MOSFET doesn't need DESAT function, I guess. Anything else?

Best regards,
Shinichi Yokota

  • 0
    TI__Intellectual 1665 points

    Hi Yokota-san,

    The supply voltages of VCC2 and VEE2 are different for MOSFET and IGBT applications. To be more specific, the supply voltages for SI MOSFET is usually +12V/0V, and +20V/-5V for SIC MOSFET while +15V and -8V for IGBT. ISO5451-Q1 has a voltage monitor function for VCC2, and the threshold voltage is 12.6V(TYP). The driver output will be disabled in case of the brownout of power supplies. That said, ISO5451 would be suitable to drive SIC MOSFET. 

    Regarding DESAT protection, customer can use Zener diode and resistors to adjust the protection threshold to be appropriate for MOSFET. 

    Please let me know of any further questions. 

    With Regards,

    Xiong

  • 0 in reply to Xiong Li
    TI__Genius 9715 points

    Xiong-san,

    If the device's DESAT function is not used, how should the DESAT pin be dealt with on schematic and PCB for the device to function properly?

    Best regards,
    Shinichi Yokota

  • 0 in reply to Shinichi Yokota
    TI__Intellectual 1665 points

    Yokota-san,

    Sorry for the late response. I did not receive any email remind on this thread.

    The DESAT pin needs to be shorted to GND2 in order to bypass the function. 

    With Regards,

    Xiong