Patent ID: 6775164
Filing Date: 2004-08-10
Classification: H02M

Abstract:
A three-terminal low-voltage pulse width modulation (PWM) controller embodied in a unitary integrated circuit (IC) comprising:(a) a first terminal providing an input node for receiving operating bias current supply and a feedback control signal related to an output parameter of an electrical circuit controlled by the PWM controller, (b) a second terminal providing an output node connected to a digital output switch providing digital width-modulated control pulses at a control pulse rate to control duty cycle of the electrical circuit, the digital width-modulated control pulses being width-modulated, (c) a third terminal providing a ground connection, (d) clocked pulse width modulation circuitry responsive to current flow between the second terminal and the third terminal and the feedback control value for controlling width-modulated pulses put out by the digital output switch at the control pulse rate, and (e) feedback separation circuitry for separating the feedback control signal from the operating bias current supply.