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Step-down switching circuit

  • US 9,178,428 B2
  • Filed: 08/29/2013
  • Issued: 11/03/2015
  • Est. Priority Date: 03/13/2013
  • Status: Active Grant
First Claim
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1. A step-down switching circuit comprising:

  • a first switch element having a first end connected to an input terminal supplied with a power supply voltage and a second end connected to a switch terminal connectable to an inductor between the switch terminal and a feedback terminal;

    a second switch element having a first end connected to the second end of the switch terminal and a second end connected to a ground terminal;

    an amplifier having a first input supplied with a reference voltage;

    an amplifier capacitor having a first end connected to the feedback terminal and a second end connected to a second input of the amplifier;

    a first resistor having a first end connected to the first end of the amplifier capacitor;

    a second resistor having a first end connected to a second end of the first resistor and a second end connected to an output of the amplifier;

    a third resistor having a first end connected to the second end of the first resistor and a second end connected to the second end of the amplifier capacitor;

    an oscillator that outputs a voltage of a triangular wave;

    a comparator that receives the voltage of the triangular wave and a voltage of an amplifier signal from the amplifier and outputs a comparison signal of the voltages; and

    a control circuit that complementarily turns on/off the first switch element and the second switch element based on the comparison signal outputted from the comparator.

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