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Pulse width modulation control circuit

  • US 5,606,296 A
  • Filed: 02/13/1996
  • Issued: 02/25/1997
  • Est. Priority Date: 07/27/1995
  • Status: Expired due to Term
First Claim
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1. A pulse width modulation circuit comprising:

  • a sawtooth oscillating means for generating a sawtooth voltage after receiving a synchronizing signal;

    a sawtooth controller for receiving said sawtooth voltage generated from said sawtooth oscillating means, receiving a reference voltage with respect to said sawtooth voltage, and outputting a current controlling constantly the amplitude of said sawtooth voltage to said sawtooth oscillating means; and

    a pulse width modulating means for receiving an output voltage, also receiving a reference voltage with respect to said output voltage, then receiving said sawtooth voltage generated from said sawtooth oscillating means, and modulating pulse width of said sawtooth voltage.

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