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Bootstrap driver

  • US 20050110556A1
  • Filed: 07/29/2004
  • Published: 05/26/2005
  • Est. Priority Date: 07/31/2003
  • Status: Active Grant
First Claim
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1. A bootstrap driver, comprising:

  • an output stage having an N-type high-side transistor and an N-type low-side transistor, which are arranged in series between a positive supply terminal and a negative supply terminal, an output of the driver being tapped from a common node between these transistors;

    a first control circuit for controlling the high-side transistor and a second control circuit for controlling the low-side transistor;

    a first voltage regulator having an output delivering a first supply voltage for said first control circuit, and a second voltage regulator having an output delivering a second supply voltage for said second control circuit, said first and second voltage regulators being mutually independent;

    a bootstrap capacitance arranged between the output of the driver and a boost-voltage node;

    a bootstrap diode having an anode connected to the output of the first voltage regulator and a cathode connected to the boost-voltage node; and

    a recovery diode having an anode connected to the output of the first voltage regulator and a cathode connected to the positive supply terminal, in order to conduct a reverse current of the bootstrap diode when the output of the driver switches from a low state, wherein the low-side transistor is on and the high-side transistor is off, to a high state wherein the low-side transistor is off and the high-side transistor is on.

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