| US 7,593,242 B2 | ||
| Method and apparatus for increasing the power capability of a power supply | ||
| Chan Woong Park, Seoul (Korea, Republic of); Alex B. Djenguerian, Saratoga, Calif. (US); and Kent Wong, Fremont, Calif. (US) | ||
| Assigned to Power Intergrations, Inc., San Jose, Calif. (US) | ||
| Filed on Oct. 10, 2008, as Appl. No. 12/249,487. | ||
| Application 12/249487 is a continuation of application No. 11/177124, filed on Jul. 08, 2005, granted, now 7,453,709. | ||
| Prior Publication US 2009/0040795 A1, Feb. 12, 2009 | ||
| Int. Cl. H02M 3/335 (2006.01); G05F 1/00 (2006.01) | ||
| U.S. Cl. 363—21.15 [323/284; 363/21.16] | 20 Claims |
| 1. A power supply, comprising:
an energy transfer element coupled between an input and an output of the power supply;
a switch coupled to the input of the energy transfer element; and
a controller coupled to the switch to control switching of the switch to regulate a transfer of energy from the input of the
power supply to the output of the power supply in response to a feedback signal received from the output of the power supply
and in response to a voltage of a bypass capacitor that is coupled to the controller, wherein the controller is coupled to
limit a maximum on time period of the switch to a first maximum on time period in response to a first range of power supply
operating conditions and is coupled to limit a second maximum on time period for a second range of power supply operating
conditions wherein the second maximum on time period is controlled by extending a time period of an oscillator of the controller.
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