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Switching regulator with proportional-integral (PI) control compensation network clamp

  • US 10,666,139 B1
  • Filed: 02/27/2019
  • Issued: 05/26/2020
  • Est. Priority Date: 02/27/2019
  • Status: Active Grant
First Claim
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1. A switching regulator circuit to supply a current at a regulated voltage to an output node coupled to a load, the switching regulator circuit comprising:

  • a power stage circuit configured to supply the current to the output node, the power stage circuit including an inductor and a switch circuit and coupled between an input node and the output node;

    an error amplifier circuit configured to receive a representation of an output node voltage and generate a current control signal to maintain the output node at the regulated voltage by controlling an inductor current;

    a compensation network coupled to an output node of the error amplifier circuit, the compensation network including at least one resistor and at least one capacitor, the at least one resistor electrically coupled to the output node of the error amplifier circuit and a control node, the at least one capacitor electrically coupled between the control node and ground;

    a unidirectional clamp circuit coupled to the control node, the unidirectional clamp circuit configured to permit a voltage at the control node to move when the voltage at the control node is higher than a reference voltage and otherwise inhibit the voltage at the control node from moving below the reference voltage; and

    a control circuit configured to receive the current control signal and control the inductor current using the current control signal.

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