Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1995-05-10
1997-03-11
Wong, Peter S.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
327537, 323287, 323284, G05F 140
Patent
active
056105037
ABSTRACT:
A dc-to-dc converter circuit for generating an output voltage from a source voltage includes a plurality of first metal oxide semiconductor field effect transistors (MOSFETs) connected in parallel and collectively defining a gate, a source and a drain. A driver circuit preferably includes a bipolar transistor connected to the gate for turning on the first MOSFETs. A second MOSFET is preferably connected to the gate for turning off the plurality of first MOSFETs. The dc-to-dc converter also preferably includes a clamp circuit connected to the plurality of first MOSFETs across the drain and source thereof. Protection, soft-start and status features are also preferably incorporated into the dc-to-dc converter. A voltage divider is connected to a reference voltage for dividing a first reference voltage to thereby generate a second reference voltage less than a desired output voltage. An error amplifier is connected to the voltage divider for generating an error signal based upon a difference between the second reference voltage and an actual output voltage. External control of the output voltage may be achieved by over-driving a node of the voltage divider, such as to facilitate enhanced operation of a microprocessor or memory device having an preferred operating voltage. A digital-to-analog converter supplies the analog error driving signal from the microprocessor or memory device. Method aspects of the invention are also disclosed.
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Dohanich George
Fogg John K.
Utter Wayne
Celestica Inc.
Riley Shawn
Wong Peter S.
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