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CONTROL CIRCUIT AND CONTROL METHOD FOR SWITCHING REGULATOR AND SWITCHING REGULATOR WITH THE SAME

  • US 20170338738A1
  • Filed: 05/01/2017
  • Published: 11/23/2017
  • Est. Priority Date: 05/18/2016
  • Status: Active Grant
First Claim
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1. A control circuit for a switching regulator having a first switch, the control circuit comprising:

  • a) an ON signal generator configured to generate an ON signal;

    b) an OFF signal generator configured to generate a first control signal according to an input voltage and an output voltage of said switching regulator;

    c) an on time regulator configured to generate an adjustment signal according to a switching signal and said first control signal, wherein an on time of said first switch is controlled to be a constant on time when an off time of said first switch is greater than or equal to a reference time; and

    d) a logic circuit configured to generate an off signal according to said first control signal, and to generate said switching signal according to said ON signal and said OFF signal, wherein said on time of said first switch is regulated according to said off time of said first switch when said off time of said first switch is less than said reference time, in order to regulate a duty cycle of said switching signal.

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