Title:
CONTROLLER FOR DC TO DC CONVERTER
Document Type and Number:
WIPO Patent Application WO2004045051
Kind Code:
A3
Abstract:
A switching circuit includes at least one switch, and a controller configured to provide a periodic control signal. The switch is responsive to the periodic control signal to change states with a start of each period, and a frequency of the periodic control signal has a predetermined minimum frequency level greater than an audible frequency limit for humans. The switching circuit may be used to control a high side switch and a low side switch in a DC to DC converter. A controller having an input voltage sensing circuit to sense an input of a DC to DC converter without using an additional input pin is also provided. Related methods are also provided. A dual phase controller having a phase selection circuit to select between phases is also provided.
Inventors:
LIPCSEI LASZLO (US)
POPESCU SERBAN-MIHAI (US)
POPESCU SERBAN-MIHAI (US)
Application Number:
PCT/US2003/035778
Publication Date:
December 23, 2004
Filing Date:
November 12, 2003
Export Citation:
Assignee:
O2MICRO INC (US)
LIPCSEI LASZLO (US)
POPESCU SERBAN-MIHAI (US)
LIPCSEI LASZLO (US)
POPESCU SERBAN-MIHAI (US)
International Classes:
H02M1/088; H02M1/12; H02M3/157; H02M3/158; (IPC1-7): H02M1/12
Foreign References:
| US6137240A | 2000-10-24 | |||
| US6366070B1 | 2002-04-02 | |||
| US6313616B1 | 2001-11-06 | |||
| US5959441A | 1999-09-28 |
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