Switch-mode regulators and methods providing transient response

Details Switch-mode regulators and methods providing transient response Switch-mode regulators and methods providing transient response

1997-03-06

1999-03-30

Berhane, Adolf Deneke

Electricity: power supply or regulation systems

Output level responsive

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

363 17, G05F 156, H02M 3335

Patent

active

058893920

ABSTRACT:
Switch-mode regulators and methods providing transient response speed-up in the presence of large load transients. Speed-up is achieved by coupling a first MOSFET switch between the regulator output and the input voltage and a second MOSFET switch between the regulator output and the circuit common connection. During normal operation these MOSFETs are off, but in the event of a large load transient substantially disturbing the regulator output, one of the MOSFETs is momentarily turned on to couple the regulator output to the input voltage or circuit ground as appropriate to bring the regulator output within a narrow range around the nominal output voltage. Operation of the MOSFETs is disabled on startup until the regulator output is within a predefined range, and whenever the regulator output exceeds a limit range indicative of a fault condition.

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