| US 7,558,084 B2 | ||
| Switching mode power supply with compensated propagation delay | ||
| Kyung Oun Jang, Incheon (Korea, Republic of) | ||
| Assigned to Fairchild Korea Semiconductor, Ltd., Bucheon (Korea, Republic of) | ||
| Filed on Oct. 25, 2006, as Appl. No. 11/586,992. | ||
| Claims priority of application No. 10-2005-0100558 (KR), filed on Oct. 25, 2005. | ||
| Prior Publication US 2007/0091651 A1, Apr. 26, 2007 | ||
| Int. Cl. H02M 3/335 (2006.01); H02H 7/122 (2006.01); H02M 3/24 (2006.01) | ||
| U.S. Cl. 363—21.12 [363/56.1; 363/97] | 22 Claims |
| 1. A switching mode power supply (SMPS) comprising:
a power supply including a main switch coupled to a primary coil of a transformer, and supplying power to a secondary coil
of the transformer according to an operation of the main switch;
a feedback circuit for generating a feedback voltage corresponding to an output voltage of the secondary coil; and
a switching controller essentially compensating a propagation delay including a comparator,
the comparator being coupled to a feedback voltage terminal to receive a reference voltage corresponding to a feedback voltage,
and to a sense voltage terminal via a propagation delay compensator to receive a first signal, related to a first voltage
corresponding to a current flowing through the main switch, and
the comparator being configured to compare the reference voltage to the first signal and to control a duty of the main switch
according to the result of the comparison.
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