Patent ID: 7541792

Claim:
A power supply controller comprising: a switching control circuit coupled to receive an error signal and a ramp signal and responsively form a switching control signal to regulate an output voltage; a compensation control circuit configured to receive the error signal and form a compensation control signal that is substantially the same as the error signal for values of the error signal that are between a first value and a second value and that limits the compensation control signal to the first value when the error signal is no less than the first value and limits the compensation control signal to the second value when the error signal is no greater than the second value, the compensation control circuit configured to form a compensation signal that is substantially constant for values of the error signal that are between the first value and the second value and that has variations that are substantially equal to a difference between the error signal and the first value for values of the error signal that are no less than the first value and that has variations that are substantially equal to a difference between the error signal and the second value for values of the error signal that are no greater than the second value; a first summing circuit configured to sum the compensation signal with a feedback signal that is representative of the output voltage and form a compensated signal; and an error signal generator configured to receive the compensated signal wherein the power supply controller uses the compensated signal to form the error signal.