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UCC5390E Driver Side Power Supply Problem

harnam trehin
Prodigy 20 points

UCC5390E, Driver side Power Supply problem

I am using DC5390E, have dual power supply +15, -3 V, wRG, when I connect it to the chip it drops to +5 and .-0.33 volt. WRTG? Caps between GRND and VCC2 and VEE2 are connected.as per data sheet.

  • 0
    TI__Mastermind 19256 points

    Hi Harnam,

    Could this be a problem with the dual power supply? Is it able to provide enough DC? 

    Can you clarify what you mean by wRG and WRTG?

    If the UCC5390E was damaged and is pulling in lots of current, it would become very hot. Is that the case? If so, maybe you will need to use a larger gate resistor to limit output current and voltage overshoots.

    Best regards,

    Sean 

  • 0 in reply to Sean Cashin
    Prodigy 20 points

    WRTG, With Respect To Ground,

    The power supply goes from +15 V to +5 volt, as soon as we connect it. If it is the low gate resistance, it will only happen when gate is switched on,

    We tried two gate drivers and two DC/DC converters both have the same results.

    Regards,

  • 0 in reply to harnam trehin
    TI__Mastermind 19256 points

    Is there a short circuit between the MOSFET gate and source? The MOSFET input is supposed to be a capacitor load, but if the gate experiences overvoltage, it will become a short circuit, and the driver may be pulling down the power supply as it attempts to drive this short circuit.