Voltage droop control in a voltage-regulated switched mode power supply

摘要

A switched mode power supply (SMPS) comprising a controller configured to control switching of the SMPS to regulate an output voltage at an output of the SMPS based on a feedback signal that indicates the output voltage, and a voltage droop control circuit. The voltage droop control circuit comprises a voltage droop control signal generator that detects a voltage drop across a component of the SMPS that is indicative of a current flowing through the output of the SMPS during operation. The voltage droop control signal generator is an active device arranged to generate, based on the detected voltage drop, an output voltage droop control signal for causing the controller to adjust the regulation of the output voltage. The voltage droop control circuit further comprises a reference voltage generator arranged to bias at least one of the first and second inputs of the voltage droop control signal generator.

主权项

1. A switched mode power supply comprising:
a controller configured to control switching of the switched mode power supply to regulate an output voltage at an output of the switched mode power supply based on a feedback signal that is indicative of the output voltage; and a voltage droop control circuit comprising:
a voltage droop control signal generator having a first input and a second input coupled so as to detect a voltage drop across a component of the switched mode power supply that is indicative of a current flow through the output of the switched mode power supply during operation, and in which the second input is coupled to the output, wherein the voltage droop control signal generator is an active device that is arranged to generate, based on the detected voltage drop, an output voltage droop control signal that causes the controller, along with the feedback signal, to adjust the regulation of the output voltage; and a reference voltage generator arranged to provide a voltage reference to bias the second input of the voltage droop control signal generator to adjust the regulation of the output voltage when the current flow is out of the output and also to adjust the regulation of the output voltage when the current flow is into the output.