US 9,812,956 B2
Artificial ripple modulation control circuitry
Weihong Qiu, San Ramon, CA (US); and Shangyang Xiao, Daly City, CA (US)
Assigned to Fairchild Semiconductor Corporation, San Jose, CA (US)
Filed by Fairchild Semiconductor Corporation, San Jose, CA (US)
Filed on Mar. 24, 2016, as Appl. No. 15/79,924.
Claims priority of provisional application 62/137,478, filed on Mar. 24, 2015.
Prior Publication US 2016/0285368 A1, Sep. 29, 2016
Int. Cl. H02M 3/156 (2006.01)
CPC H02M 3/156 (2013.01) 19 Claims
OG exemplary drawing
 
1. A power supply system, comprising:
power switch circuitry configured to switch an input voltage of a power supply to generate a switched input voltage;
output circuitry including an inductor to generate an output voltage of the power supply from the switched input voltage;
pulse width modulation (PWM) controller circuitry configured to generate a PWM signal to control the power switch circuitry, wherein the PWM controller circuitry is further configured to turn OFF the PWM signal based on a ramp signal that emulates, at least in part, current of the inductor and a feedback signal indicative of an error between the output voltage and a reference voltage; and
inductor ripple current and slope compensation voltage emulation circuitry configured to receive a signal proportional to the input voltage of the power supply and the PWM signal and generate the ramp signal that emulates the current of the inductor.