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DRV8353RH-EVM: GHx becomes High level when 0 is input to all INHx and INLx with 6x PWM setting

Yuki Yoshida
Prodigy 10 points
Part Number: DRV8353RH-EVM

Hello.

It sets the PWM mode to the 6 xPWMs mode at present. It becomes a high without GHA, GHB and GHC becoming Low when inputting 0 to all INL and INH terminal and making ENABLE High from Low because we want to make all FETes an off condition at starting-up of a software. A attachment image  is the INHA, INLA, INHB, INLB, GHA, GLA and ENABLE signal from above.  High is output like GHA about GHB, GHC, too. Is the IC out of order?

  • +1
    TI__Mastermind 21805 points

    Hello Yoshida-san,

    If all inputs are zero all MOSFETs are OFF. In this case the leakage in the system will determine the state of SHx and GHx. The DRV835x has some leakage coming out of SHx which will pull up on SHx if it is not being driven.

    Please measure the SHx voltage to confirm that GHx and SHx are the same voltage and the high-side MOSFET is OFF.

    Thanks,

    Matt

  • 0 in reply to Matt Hein
    Prodigy 10 points

    Hello Matt-san,

    It was confirmed that GHx and SHx have the same voltage and that the high-side MOSFET is turned off.

    Thank you for your advice.