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Load dump protection for power FET device

  • US 7,864,496 B2
  • Filed: 12/03/2007
  • Issued: 01/04/2011
  • Est. Priority Date: 12/04/2006
  • Status: Active Grant
First Claim
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1. A load dump protection system operable to provide protection for a power transistor used to drive a blower motor of a vehicle, said load dump protection system comprising:

  • said power transistor connected in series with a load;

    circuitry for detecting an over-voltage transient, said circuitry adjusting a drive transistor into a saturation mode in response to a detection of an over-voltage transient, said circuitry lowering the power dissipated by said drive transistor when said drive transistor is in said saturation mode; and

    wherein said circuitry adjusts an op-amp circuit to turn said power transistor fully on by applying a maximum voltage to a gate of said power transistor in said over-voltage transient condition drive transistor to adjust said drive transistor to said saturation mode.

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