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Circuit for charging a bootstrap capacitor in a voltage converter

  • US 7,741,901 B2
  • Filed: 02/05/2008
  • Issued: 06/22/2010
  • Est. Priority Date: 02/08/2007
  • Status: Active Grant
First Claim
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1. A circuit for charging a bootstrap capacitor in a voltage converter having a high-side transistor and a low-side transistor connected in series and switched by a high-side driver and a low-side driver respectively, the bootstrap capacitor being connected between a source of the high-side transistor and a high-side power input of the high-side driver, the circuit comprising:

  • a first transistor connected between the bootstrap capacitor and a feedback node, for being switched synchronously with the low-side transistor;

    a dedicated comparator for comparing a feedback voltage drawn from the feedback node with a reference voltage, to produce a control signal, the dedicated comparator being operable without a compensation circuit; and

    a second transistor controlled by the control signal, for determining to connect a supply voltage to the feedback node to charge the bootstrap capacitor.

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