Switch mode regulator controller using hybrid technique

Details Switch mode regulator controller using hybrid technique Switch mode regulator controller using hybrid technique

2002-11-01

2004-02-24

Le, Don (Department: 2819)

Electronic digital logic circuitry

Interface

Current driving

C326S086000, C326S027000

Reexamination Certificate

active

06696861

ABSTRACT:

FIELD OF THE INVENTION
This invention generally relates to electronic systems and in particular it relates to a switch mode regulator with a hybrid hysteretic controller.
BACKGROUND OF THE INVENTION
The classical prior art voltage mode control for a switch mode regulator does not perform to tight output voltage tolerance requirements during load transients. The standard prior art hysteretic control for a switch mode regulator maintains a better regulation of voltage tolerance, but causes extreme switching frequencies.
SUMMARY OF THE INVENTION
A switch mode controller circuit includes: a hysteretic comparator for monitoring an output of a switch mode circuit; a standard comparator for monitoring a phase of the switch mode circuit; a logic block having a first input coupled to a clock signal generator, a second input coupled to an output of the hysteretic comparator, and a third input coupled to an output of the standard comparator, wherein the logic block generates switching cycles based on a fixed ON/OFF time during a first part of a cycle and based on a hysteretic control during a second part of the cycle.


REFERENCES:
patent: 4948991 (1990-08-01), Schucker et al.
patent: 5122690 (1992-06-01), Bianchi
patent: 6486699 (2002-11-01), Friebe et al.
patent: 6489809 (2002-12-01), Kiehl

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