Patent ID: 7583128

Claim:
A controller for fast transient response comprising: a first linear compensation circuit for receiving a load voltage and generating a linear output voltage during steady state operation; and a step up non-linear control circuit connected in parallel with the linear compensation circuit for comparing a load voltage to a step up reference voltage to generate a step up non-linear signal when the load voltage is less than the step up reference voltage; a step down non-linear control circuit connected in parallel with the linear compensation circuit for comparing a load voltage to a step down reference voltage to generate a step down non-linear signal when the load voltage is greater than the step up reference voltage; and an error amplifier and pulse width modulator for comparing the load voltage to a reference voltage to detect a transient period and summing the step up signal with the linear output, wherein only a first impulse of the step up non-linear signal is summed with the linear output during step up transient periods and subtracting the step down non-linear signal from the linear output by a second one shot circuit, wherein only a first pulse of the step down non-linear signal is subtracted from the linear output during step down transient periods, wherein the combination linear and non-linear control provides stability and reduces delay times for fast transient response.