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Method of optimum current blanking time implementation in current sense circuit

  • US 20090134856A1
  • Filed: 11/26/2007
  • Published: 05/28/2009
  • Est. Priority Date: 11/26/2007
  • Status: Active Grant
First Claim
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1. A current sensing circuit comprising:

  • a power switch coupled to receive a current from a switching input, the power switch being controlled by a gate signal, wherein a turn on of the power switch causes the current to have an initial transient spike;

    a buffer having a buffer input and a buffer output, the buffer input being coupled to receive the gate signal and provide a buffered gate signal at the buffer output, wherein the buffer output is disabled during the initial transient spike;

    a sense switch coupled to receive a portion of the current from the switching input, the sense switch being turned on by the buffered gate signal after the initial transient spike; and

    a sense resistor coupled to receive the portion of the current from the sense switch.

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