Patent ID: 9118245
Filing Date: 2015-08-25
Classification: G06F,H02M

Abstract:
1. A power supply providing an output voltage, the power supply comprising: an error amplifier controlling the power supply based on comparing a reference voltage with a feedback voltage representative of the output voltage, one input of the error amplifier being coupled to a feedback voltage via at least one resistor, wherein the error amplifier receives the output voltage representation through the feedback voltage; a droop circuit generating a droop current dropping a droop voltage on the at least one resistor; a first counter having an output count that is changed from a present first digital count corresponding to a present voltage code value toward a target first digital count corresponding to a new voltage code value based on a received digital voltage code that corresponds to an output voltage value; a second counter having a second output count and being preset to an offset count value when the new voltage code value is received, wherein the output count of the first counter is combined with the second output count of the second counter to generate a combined count value; wherein the second counter decrements the second output count from the offset count value to zero when the first counter reaches the target first digital count; and a digital to analog converter (DAC) configured to provide the reference voltage based on the combined count value, wherein the DAC offsets the reference voltage based on the offset count value during an output voltage transition corresponding to a transition from the present voltage code value to the new voltage code value.