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LM7480-Q1: Schematic Review - Reverse Polarity Protection

Stexas Connor
Prodigy 10 points
Part Number: LM7480-Q1
Other Parts Discussed in Thread: LM74800-Q1

Tool/software:

Hi, please review the schematic below in particular for reverse polarity protection up to 45V. Some parts of the actual schematic (bypass capacitors and input/output filters are not shown).

  • 0
    TI__Mastermind 46210 points

    Hi Stexas,

    This is the correct way of using LM74800-Q1 in Ideal diode mode only. Please change your schematic according to this. (CAP and VS comes after the DGATE FET)

    This resistor and Zener are not required as this is used only in surge stopper configuration which requires a use of HGATE as well. This can be removed.

    The input TVS used are 3XSM8S18CA. Their clamping voltage is out of the abs-max of controller. Do you expect any negative transients that can violate the abs-max? 

    (-65V)

    Regards,

    Shiven Dhir