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STEP-DOWN SWITCHING MODE POWER SUPPLY AND THE METHOD THEREOF

  • US 20140159693A1
  • Filed: 12/10/2013
  • Published: 06/12/2014
  • Est. Priority Date: 12/10/2012
  • Status: Abandoned Application
First Claim
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1. A step-down switching mode power supply, comprising:

  • a Buck converter having an input terminal configured to receive an input voltage, an output terminal configured to provide power to a load, and a control terminal configured to receive a control signal to regulate the power provided to the load, wherein the Buck converter comprises a power switch and an energy storage component storing or transferring energy as the power switch is turned ON or OFF;

    a current sense circuit coupled to the power switch to generate a current sense signal based on a current flowing through the power switch;

    a square circuit having an input terminal configured to receive the input voltage, and an output terminal configured to generate a first multiply signal indicating the squared value of the input voltage;

    a multiply circuit having a first input terminal coupled to the square circuit to receive the first multiply signal, a second input terminal configured to receive a second multiply signal, and an output terminal configured to generate a product signal based on the first multiply signal and the second multiply signal;

    a current comparison circuit having a first input terminal coupled to the current sense circuit to receive the current sense signal, a second input terminal coupled to the multiply circuit to receive the product signal, and an output terminal configured to generate a current comparison signal based on the current sense signal and the product signal; and

    a logic circuit coupled between the output terminal of the current comparison circuit and the control terminal of the Buck converter, wherein the power switch is turned OFF by the logic circuit when the current sense signal is larger than or equal to the product signal.

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