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Switch control circuit and buck converter comprising the same

  • US 10,277,128 B2
  • Filed: 06/29/2016
  • Issued: 04/30/2019
  • Est. Priority Date: 06/29/2015
  • Status: Active Grant
First Claim
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1. A switch control circuit for a power switch and a synchronous switch that are connected to an inductor, the switch control circuit comprising:

  • a comparator configured to compare a detection voltage indicating a present magnitude of an inductor current flowing through the inductor with a predetermined reference voltage;

    a delay unit configured to delay an output of the comparator by a zero voltage delay time; and

    a dead time calculation unit configured to;

    produce, by measuring an OFF time of the power switch using an OFF counter, a TOFF signal having a value corresponding to the OFF time, andcalculate a dead time based on the zero voltage delay time, the TOFF signal, and an input voltage that is input to the power switch,wherein the switch control circuit is configured to control a turn-off time of the synchronous switch according to an output of the delay unit, and turn on the power switch when the dead time passes following the turn-off time of the synchronous switch.

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