Step-up/step-down voltage regulator using an MOS synchronous rec

Details Step-up/step-down voltage regulator using an MOS synchronous rec Step-up/step-down voltage regulator using an MOS synchronous rec

1998-09-22

1999-07-27

Nguyen, Matthew

Electricity: power supply or regulation systems

In shunt with source or load

Using a three or more terminal semiconductive device

323222, 323282, G05F 1613, G05F 156

Patent

active

059296151

ABSTRACT:
A circuit and method for providing a voltage regulation despite variations in the supply voltage and/or the load utilize a MOS synchronous rectifier in a flyback topology to perform both step-up and step-down operations. The circuit operates in a boost-type operation until the voltage at an output terminal exceeds a predetermined shut-off voltage. At such time, a duty cycle of the circuit is suspended until the voltage at the output terminal falls below the predetermined shut-off voltage. Triggering the duty cycle and the suspension of the duty cycle are dependent solely upon the voltage at the output terminal. The circuit includes a steering device that connects the body of MOS synchronous rectifier to either its source or its drain to consistently configure the MOS synchronous rectifier in a reverse-biased condition. Preferably, the steering device is comprised of two PMOS transistors that are controlled by the voltages at the source and drain of MOS synchronous rectifier.

REFERENCES:
patent: 4459537 (1984-07-01), McWhorter
patent: 5036269 (1991-07-01), Murari et al.
patent: 5453678 (1995-09-01), Bertolini et al.
patent: 5721483 (1998-02-01), Kolluri et al.
patent: 5864226 (1999-01-01), Wang et al.

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