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Voltage regulation circuits and power supply devices using the same

  • US 9,772,637 B2
  • Filed: 06/07/2013
  • Issued: 09/26/2017
  • Est. Priority Date: 06/07/2013
  • Status: Active Grant
First Claim
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1. A voltage regulation circuit for regulating a level of a supply voltage provided by an automotive battery, the voltage regulation circuit comprising:

  • a selector receiving a plurality of predetermined voltages and selecting one of the plurality of predetermined voltages according to a control signal to serve as a first reference voltage;

    an error amplifier generating an error signal according to the first reference voltage and a divided voltage signal;

    a voltage divider, receiving a feedback signal and performing a voltage division operation to the feedback signal to generate the divided voltage signal; and

    a buffer coupled between the voltage divider and the error amplifier and buffering the divided voltage signal to the error amplifier, wherein the buffer comprises a unity gain buffer amplifier,wherein the feedback signal is related to the supply voltage,wherein the plurality of predetermined voltages comprises at least a first predetermined voltage and a second predetermined voltage, and each of the first predetermined voltage and the second predetermined voltage is independent of the level of the supply voltage,wherein the voltage regulation circuit regulates the level of the supply voltage according to the error signal.

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