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Apparatus providing protection for power converter

  • US 7,847,533 B2
  • Filed: 08/30/2009
  • Issued: 12/07/2010
  • Est. Priority Date: 07/31/2006
  • Status: Active Grant
First Claim
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1. A switching circuit for a power converter, comprising:

  • an oscillation circuit directly generating a switching signal for regulating an output of the power converter, the oscillator circuit further receives a control signal and a frequency of the switching signal is varied according to the control signal directly;

    a first circuit generating a threshold signal; and

    a first comparator coupled to receive a signal representative of a current through a power switch, the first comparator generating the control signal in response to the signal and the threshold signal, wherein the frequency of the switching signal is increased in response to enabling of the control signal.

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