US 11,737,187 B2
Average inductor current control with open- and closed-loop regulation
Damien Bruvier, Colomiers (FR); and Dominique Romeo, Montauban (FR)
Assigned to SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Scottsdale, AZ (US)
Filed by SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Phoenix, AZ (US)
Filed on Mar. 15, 2022, as Appl. No. 17/654,958.
Claims priority of provisional application 63/200,744, filed on Mar. 25, 2021.
Prior Publication US 2022/0312561 A1, Sep. 29, 2022
Int. Cl. H05B 45/345 (2020.01); H05B 45/14 (2020.01)
CPC H05B 45/345 (2020.01) [H05B 45/14 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A method of operating an LED module, the method comprising:
controlling, by an on-off controller, a high-side FET and a low-side FET to create a plurality of charge modes and discharge modes of an inductor coupled to an LED of the LED module, each charge mode ends at a peak current indicated by a signal applied to a peak-current input of the on-off controller;
driving, by an open-loop regulator, a zenith-current signal to the peak-current input, the open-loop regulator calculates the zenith-current signal for each charge mode without using a feedback signal indicative of current through the LED; and then
driving, by a closed-loop regulator, a peak-current signal to the peak-current input, the closed-loop regulator calculates the peak-current signal for each charge mode based on the feedback signal indicative of current through the LED.