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Integrated start-up circuit with reduced power consumption

  • US 20050052886A1
  • Filed: 09/04/2003
  • Published: 03/10/2005
  • Est. Priority Date: 09/04/2003
  • Status: Active Grant
First Claim
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1. An integrated start-up circuit comprising:

  • a start-up capacitor, for providing a supply voltage for powering a control-circuit of the power supply, wherein said start-up capacitor is coupled to a supply voltage terminal of said control-circuit;

    a first bleeding resistor, connected from a first AC input of a bridge rectifier to said start-up capacitor;

    a second bleeding resistor, connected from a second AC input of said bridge rectifier to said start-up capacitor; and

    an ON/OFF circuit, for controlling PWM operation, wherein said ON/OFF circuit will enable PWM operation whenever said supply voltage of said start-up capacitor exceeds a start-threshold voltage, and wherein said ON/OFF circuit will disable PWM operation after the supply voltage drops below a stop-threshold voltage.

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