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Regulator having phase compensation circuit

  • US 8,179,108 B2
  • Filed: 08/02/2009
  • Issued: 05/15/2012
  • Est. Priority Date: 08/02/2009
  • Status: Active Grant
First Claim
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1. A regulator, comprising:

  • an output transistor including a control terminal to which a control voltage is applied, wherein the output transistor generates an output current in accordance with the control voltage;

    a differential amplifier that controls via feedback the control voltage in accordance with a level of the output current; and

    a phase compensation circuit connected between the differential amplifier and the control terminal of the output transistor, wherein the phase compensation circuit adjusts an output impedance of the differential amplifier, and wherein the phase compensation circuit includes a variable resistor that decreases the output impedance of the differential amplifier when the output current increases.

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