US 11,750,099 B2
Method and system of a quasi-constant on-time controller
Alessandro Zafarana, Milan (IT)
Assigned to SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Scottsdale, AZ (US)
Filed by SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Phoenix, AZ (US)
Filed on Oct. 10, 2022, as Appl. No. 18/45,302.
Application 18/045,302 is a continuation of application No. 17/248,513, filed on Jan. 28, 2021, granted, now 11,502,605.
Claims priority of provisional application 62/706,759, filed on Sep. 9, 2020.
Prior Publication US 2023/0063009 A1, Mar. 2, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H02M 3/158 (2006.01); H02M 1/08 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/158 (2013.01) [H02M 1/08 (2013.01); H02M 1/0006 (2021.05); H02M 1/0025 (2021.05)] 20 Claims
OG exemplary drawing
 
16. A system comprising:
an inductor defining a first lead and a second lead;
a first electrically-controlled switch defining a current input coupled to an input voltage, a current output coupled to the first lead, and a control input;
a second electrically-controlled switch defining a current input coupled to a ground reference, a current output coupled to the first lead, and a control input;
an output capacitor having a first connection coupled to the second lead of the inductor, and a second connection coupled to the ground reference;
a load coupled to the second lead of the inductor;
a driver circuit comprising:
an on-time controller defining a set input and a compensation input, the on-time controller coupled to the control input of the first electrically-controlled switch and the control input of the second electrically-controlled switch;
a voltage controller coupled to the set input, the voltage controller configured to assert the set input at a switching frequency, the switching frequency based on a voltage difference between an output voltage and a setpoint voltage;
the on-time controller is configured to, responsive to assertion of the set input, place the inductor in a charge mode by making the first electrically-controlled switch conductive and the second electrically-controlled switch non-conductive;
the on-time controller is configured to maintain the charge mode for an on-time, the on-time having a duration based on a compensation signal received on the compensation input; and
a bypass controller coupled to the compensation input, the bypass controller configured to drive the compensation signal to the on-time controller, the compensation signal proportional to the voltage difference.