US 7,385,832 B2
Method of forming a secondary-side controller and structure therefor
Terry Allinder, Mesa, Ariz. (US)
Assigned to Semiconductor Components Industries, L.L.C., Phoenix, Ariz. (US)
Filed on Jul. 03, 2006, as Appl. No. 11/479,164.
Prior Publication US 2008/0002441 A1, Jan. 03, 2008
Int. Cl. H02M 3/335 (2006.01); H02M 7/217 (2006.01)
U.S. Cl. 363—21.14  [363/21.18; 363/127] 16 Claims
OG exemplary drawing
 
1. A secondary-side power supply controller comprising:
a switching section configured to form a drive signal to drive a power switch that is coupled to an inductor in a secondary-side of a power supply system; and
a burst-mode detector configured to detect the power supply system operating in a burst-mode and responsively inhibit forming the drive signal, the burst-mode detector including a timer configured to form a first time interval responsively to receiving less than a first number of occurrences of a sense signal from the inductor during the first time interval wherein the burst-mode detector is configured to reset the timer responsively to receiving the first number of occurrences of the sense signal prior to an end of the first time interval.