Patent ID: 7990127

Claim:
A controller for use in a buck converter, comprising: an integrator to be coupled to receive a current sense signal representative of a current in a switch of the buck converter, the integrator to integrate the current sense signal to produce a first input signal; a ramp generator coupled to receive an oscillating signal having a same switching period as the switch, the ramp generator to generate a piecewise linear ramp signal in response to the oscillating signal, the piecewise linear ramp signal having a delay segment of substantially zero slope followed by a plurality of segments having finite linear slopes within the switching period of the switch; a multiplier to multiply the piecewise linear ramp signal to produce a second input signal; and a drive signal generator coupled to receive a third input signal generated in response to the first and the second input signals to produce a drive signal to be coupled to control the switch to substantially regulate an output voltage of the buck converter.