US 11,671,022 B2
Primary side burst mode controller for LLC converter
Salvatore Giombanco, Cassaro (IT); Saurav Bandyopadhyay, Dallas, TX (US); and Rosario Stracquadaini, San Gregorio di Cantania (IT)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on May 5, 2021, as Appl. No. 17/308,634.
Application 17/308,634 is a continuation of application No. 15/396,031, filed on Dec. 30, 2016, granted, now 11,031,873.
Prior Publication US 2021/0257917 A1, Aug. 19, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H02M 3/335 (2006.01); H02M 1/00 (2006.01); H02M 3/00 (2006.01)
CPC H02M 3/33571 (2021.05) [H02M 1/0035 (2021.05); H02M 3/01 (2021.05)] 20 Claims
OG exemplary drawing
 
1. A circuit comprising:
a primary side including:
a first switch;
a second switch; and
a controller coupled to the first switch and to the second switch, wherein the controller is configured to:
increase an off-time for the first switch and the second switch in response to determining that a primary side current is below a first threshold;
decrease the off-time for the first switch and the second switch in response to determining that the primary side current is above a second threshold, wherein the second threshold is higher than the first threshold;
initiate a burst mode in response to determining that the primary side current falls below a third threshold, wherein the third threshold is higher than the second threshold; and
exit the burst mode in response to determining that the primary side current exceeds the third threshold; and
a secondary side coupled to the primary side.