Patent ID: 7848406
Filing Date: 2010-12-07
Classification: H02M,H03K,H03L

Abstract:
1. A switched mode power converter controller (SMPCC) for providing a PWM control signal to a power switch in a switching cycle, the SMPCC controller having a hybrid Digital Pulse Width Modulator (DPWM), the hybrid DPWM effecting the PWM control signal at a switching point at a resolution of N bits across the switching cycle, the hybrid DPWM comprising: a) a counter circuit responsive to a clock signal and determining the switching point at a resolution of N-M bits, the counter circuit providing an enable output signal at the determined switching point, b) a locked loop for delaying the clock signal to provide M clock phases from the clock signal, c) a multiplexer for selecting one of the M clock phases to provide a multiplexor output in response to a received select signal, d) an output control element having the multiplexor output as an input, wherein the control element is enabled by the enable output signal from the controller, and wherein the controller generates the multiplexor select signal so as to provide the PWM control signal at an effective resolution of N bits.