Switched mode power supply device adapted for low current...

Details Switched mode power supply device adapted for low current... Switched mode power supply device adapted for low current...

2005-05-24

2005-05-24

Laxton, Gary L. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S284000, C323S288000

Reexamination Certificate

active

06897640

ABSTRACT:
A switched mode power supply device comprising a power transistor periodically set to conduction and supplying a regulated voltage that comprises a ramp generation circuit controlled by a clock signal and periodically generating a ramp voltage. The device includes an amplifier error circuit between a reference voltage and said regulated output voltage and generates an error signal, and a comparator comparing the ramp voltage with said error voltage and providing an output signal for controlling said power circuit. The circuit is characterized in that it comprises a delay element delaying the setting to conduction of the power transistor so as to desynchronize the starting of the ramp and said setting to conduction.

REFERENCES:
patent: 4302802 (1981-11-01), Hyde et al.
patent: 5731694 (1998-03-01), Wilcox et al.
patent: 6218817 (2001-04-01), Chang
patent: 6285174 (2001-09-01), Suzuki
patent: 6396250 (2002-05-01), Bridge
patent: 0 338 834 (1989-10-01), None

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