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SWITCHING POWER SUPPLY DEVICE

  • US 20140146238A1
  • Filed: 10/22/2013
  • Published: 05/29/2014
  • Est. Priority Date: 10/23/2012
  • Status: Active Grant
First Claim
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1. A switching power supply device comprising:

  • a switching control portion that generates an output voltage from an input voltage by performing on/off control of a switch device using a non-linear control method in accordance with a comparison signal and a timer signal;

    a main comparator that compares a feedback voltage corresponding to the output voltage and a predetermined reference voltage with each other to generate the comparison signal;

    a timer portion that performs a one-shot output of the timer signal at a time point when a predetermined fixed period elapses after the on/off of the switch device is switched; and

    a backward flow detection portion that detects a backward flow for the switch device to forcibly turn off the switch device;

    whereinthe timer portion and the backward flow detection portion are turned on at a time point when a pulse edge of the comparison signal occurs and turned off at a time point when operation of each of the timer portion and backward flow detection portion is completed.

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