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CURRENT DETECTION CIRCUIT AND DCDC CONVERTER INCLUDING THE SAME

  • US 20170279357A1
  • Filed: 03/17/2017
  • Published: 09/28/2017
  • Est. Priority Date: 03/23/2016
  • Status: Active Application
First Claim
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1. A current detection circuit comprising:

  • a first sense transistor which includes a first terminal and a control terminal which are coupled respectively to a first terminal provided on an external output terminal side outputting externally an output voltage of the drive circuit and a control terminal, of terminals of a first drive transistor provided on a high side of a drive circuit, the first sense transistor being a same conductive type as the first drive transistor;

    a first operational amplifier which amplifies a potential difference between a voltage of a second terminal provided on an external input terminal side to which an input voltage is supplied externally from the drive circuit and a voltage of a second terminal of the first sense transistor, of the terminals of the first drive transistor; and

    a first current control transistor which is provided over a first current path through which a current from the first sense transistor flows, and which has a control terminal to which an output voltage of the first operational amplifier is supplied,wherein a value of a current flowing through the first drive transistor is detected from a value of the current flowing through the first sense transistor.

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