Patent ID: 8228051

Claim:
A frequency modulation controller for use in controlling a switched mode power supply including an input terminal for receiving an input voltage and at least one switch selectively turned on and off to control the output voltage of the power supply, the frequency modulation controller comprising: an analog to digital converter operable to convert a feedback signal indicative of a present output voltage into digital data; a digital conditioning unit operable to provide an error signal based on the digital data from the analog to digital converter for use in generating a frequency modulation signal; and a digital to analog converter device comprising: a memory device receiving a multiple bit signal based on the error signal and outputting an intermediate signal according to an included lookup table; and an intermediate digital to analog converter operable to receive the intermediate signal and output an analog signal used to generate the frequency modulation signal; wherein the frequency modulation signal indicates a desired duty cycle of the at least one switch to maintain a desired output voltage such that the at least one switch of the switched mode power supply is turned on and off in accordance with the desired duty cycle.