Offline converter with integrated softstart and frequency jitter

CAFC
  • US 6,107,851 A
  • Filed: 05/18/1998
  • Issued: 08/22/2000
  • Est. Priority Date: 05/18/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. A pulse width modulated switch comprising:

  • a first terminal;

    a second terminal;

    a switch comprising a control input, said switch allowing a signal to be transmitted between said first terminal and said second terminal according to a drive signal provided at said control input;

    a frequency variation circuit that provides a frequency variation signal;

    an oscillator that provides an oscillation signal having a frequency range, said frequency of said oscillation signal varying within said frequency range according to said frequency variation signal, said oscillator further providing a maximum duty cycle signal comprising a first state and a second state; and

    a drive circuit that provides said drive signal when said maximum duty cycle signal is in said first state and a magnitude of said oscillation signal is below a variable threshold level.

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