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Power MOSFET safe operating area current limiting device

  • US 5,282,107 A
  • Filed: 09/01/1992
  • Issued: 01/25/1994
  • Est. Priority Date: 09/01/1992
  • Status: Expired due to Term
First Claim
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1. A switched mode power supply chip, comprising:

  • power switching means for switching a primary winding current of a switched mode power supply transformer on and off, the power switching means comprising a first transistor for limiting the voltage applied to a drain of a second transistor;

    a low voltage tap connected to said drain of said second transistor such that a sense voltage proportional to a current passing through said first and second transistors is output from the low voltage tap when said first and second transistors are turned on; and

    comparator means for disabling the power switching means whenever said sense voltage exceeds a predetermined maximum wherein the power switching means is operated in its safe operating area.

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