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LP8863-Q1: What's the purpose of D3 in SNVU558--EVM user's guide?

Zhao Min
Prodigy 180 points
Other Parts Discussed in Thread: LP8863-Q1

 Number: LP8863-Q1

Hi Team,

     I don't know exactly the purpose of D3. Would you help to explain?

  • 0
    TI__Expert 5475 points
    Hi,

    If the power line FET is turned off for some fault protection, the energy in the inductor has the potential to cause negative voltage on the input, which may damage the electrolytic capacitors. The schottky diode is used to avoid negative voltage on the input capacitors.