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UCC28C41: Driver section fails (shorted to ground)

Tharanath PP56
Prodigy 90 points
Part Number: UCC28C41

ISL78845_sch_boost_standalone_simulation.TSC

Hi All,

Please see the UCC28C41 boost converter Tina simulation model above. 

Vin=15V, Vout= 20V, IL=1A

Gate resistor =100Ohm, Fsw=25Khz

I am facing failing of part. Its driver section is shorted to ground. Is it because of high gate resistance?(More gate resistance more switching loss?). Please help

Thanks,

Tharanath

  • 0
    TI__Mastermind 31580 points
    Hi Tharanath,

    We need to see oscilloscope plots of the gate drive voltage to be able to root cause the issue. 100R gate drive series resistance is a high value, most application use between 0R and sat 33R.

    The IC is seeing either a voltage stress or current stress on the gate drive pin. One debug test you could try is to place schottky dioes from the gate drive pin to ground and to Vcc to prevent the pin from been pulled negative by more that the forward voltage of the diode and to clmap the max pin voltage to just above Vcc.

    Regards

    Peter
  • 0 in reply to Peter Meaney
    TI__Mastermind 31580 points
    Hi Tharanath,

    Since there has been activity on this post for two weeks I am closing the post. Please open a new post if you have more questions.

    Regards

    Peter