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SYSTEM AND METHOD FOR CURRENT SENSING WITHIN A VOLTAGE REGULATOR

  • US 20120229107A1
  • Filed: 10/18/2011
  • Published: 09/13/2012
  • Est. Priority Date: 03/11/2011
  • Status: Abandoned Application
First Claim
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1. An apparatus, comprising:

  • a voltage regulator for generating a regulated output voltage responsive to an input voltage and drive control signals, the voltage regulator including a high-side switching transistor and a low-side switching transistor;

    a driver circuit for generating the drive control signals responsive to a PWM control signal;

    a PWM controller for generating the PWM control signal responsive to an error voltage and a ramp voltage;

    a error amplifier for generating the error voltage responsive to a reference voltage, the regulated output voltage and a current sense voltage signal;

    a low-side current sense amplifier for sensing a first current through the low-side switching transistor and generating a first current sense signal responsive thereto in a first mode of operation when the low-side switching transistor is turned on and the high-side switching transistor is turned off; and

    a high-side current sense amplifier for providing the current sense voltage signal responsive to the first current sense signal in the first mode of operation and for sensing a second current through the high-side switching transistor and providing the current sense voltage signal responsive thereto in a second mode of operation when the high-side switching transistor is turned on and the low-side switching transistor is turned off.

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