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Original question:

ISO5851: SiC MOS Gate Drive Help Needed

ISO5851: SiC MOS Gate Drive Help Needed

Subin Thekkan
Prodigy 20 points
Part Number: ISO5851
Other Parts Discussed in Thread: ISO5852S

hi,

can u please tell me how to design di/dt protection circuit in this driver design. since sic mosfet is having fast switching action , how we will able to detect exact fault value. if there any design available please let me know.

regards

subin

  • 0
    TI__Intellectual 1665 points

    Hi Subin,

    The di/dt rate can be limited by selecting appropriate gate resistor. Under over current or short circuit event, the di/dt rate can be pretty high and can cause high voltage spikes in the system. In ISO5852S, we have a DESAT protection function to detect over current and short circuit faults, and soft turn-off function to slow down di/dt rate to avoid high voltage spikes. Would this serve your purpose? 

    With Regards,

    Xiong

  • 0 in reply to Xiong Li
    Prodigy 20 points

    thankyou for your reply.

    actually i need to make different protection circuits: most importantly di/dt (short circuit) protection circuit for Sic inverter. so i need to know is there any reference design available for detecting device current and load current ,which i can sample and compare with some reference value and give pulse to pdcard or cpld to stop the gate driving action.

    with regards

    Subin T

  • 0 in reply to Subin Thekkan
    TI__Intellectual 1665 points

    Hi Subin,

    ISO58582S has the right functions for your applications. Please refer to TIDA00195 for more design details. The testing results are with IGBT. However, the circuits can be used well for SIC also. Please let us know if any questions.

    With regards,

    Xiong