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Small offline power supply

  • US 5,805,433 A
  • Filed: 04/16/1997
  • Issued: 09/08/1998
  • Est. Priority Date: 04/18/1996
  • Status: Expired due to Term
First Claim
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1. A power converter circuit, comprising:

  • a DC bus;

    a half bridge transistor circuit coupled across the DC bus, the half bridge transistor circuit including a high-side transistor and a low-side transistor and producing an output pulse width modulation (PWM) signal therebetween;

    a self oscillating half bridge driver circuit for producing first and second control PWM signals in response to an external threshold signal, the first control PWM signal coupled to a control terminal of the high-side transistor and the second control PWM signal coupled to a control terminal of the low-side transistor;

    a low pass filter for receiving the output PWM signal and producing a DC output voltage in response thereto across a pair of output terminals; and

    a programmable voltage regulating device having an input terminal coupled to the DC output voltage and an output terminal coupled to the external threshold voltage.

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