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UC2854BM: Why is a Schottky Barrier Rectifier needed for GTDRV pin?

Shinsuke Tanaka
Intellectual 520 points
Part Number: UC2854BM

Dear Sirs or Madams,

On the Typical Application shown on the datasheet, a Schottky Barrier Rectifier 1N5820 is implemented

between GTDRV pin and GND.

Please let me know the reason why a Schottky Barrier Rectifier is needed.

Is this needed to prevent transient excessive voltage on GTDRV pin?

Or, are there any other reasons?

Best regards,

Shinsuke Tanaka

  • 0
    TI__Mastermind 25415 points

    Hey Shinsuke,

    The Schottky diode is needed to prevent large negative voltage spikes on the pin.

    There is a worry that the undershoot of the pin will cause a negative voltage which will reverse bias the ESD protection.

    We recommend the diode is kept for this reason.

    Thanks,

    Daniel