Circuit and method of activating and de-activating a switching r

Details Circuit and method of activating and de-activating a switching r Circuit and method of activating and de-activating a switching r

1999-05-03

2000-10-24

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 21, 323284, 323272, H02M 324, G05F 140

Patent

active

061377023

ABSTRACT:
A switching regulator (18) for use in a switching power supply (10) receives a feedback signal and provides a gate drive signal. The switching regulator enables the gate drive signal once at any point during a cycle of an oscillator signal by setting a first latch (74) upon receiving a non-asserted feedback signal. Setting the first latch triggers a pulse generator (78) to generate a pulse signal. The first latch is not reset until the end of the cycle of the oscillator signal. Therefore, the pulse generator can generate only one pulse per oscillator cycle. The pulse signal sets a second latch (80) that enables the gate drive signal. The switching regulator disables the gate drive signal by resetting the second latch. A power transistor (20) conducts an inductor current through the primary winding of the transformer (16) in response to the gate drive signal.

REFERENCES:
patent: 4825144 (1989-04-01), Alberkrack et al.
patent: 5029269 (1991-07-01), Elliott et al.
patent: 5130561 (1992-07-01), Elliott et al.
patent: 5438499 (1995-08-01), Bonte et al.
patent: 5940287 (1999-08-01), Brkovic
"Theory and Applications of the MC34063 and .mu.A78S40 Switching Regulator Control Circuits", Jade Alberkrack, Motorola Semiconductor Application Note 1989, Document AN920/D Rev. 2, No Date.
"Switched Mode Power Supply Control Circuit", Signetics Data Sheet, SG1526A/SG2526A/SG3526A, Apr. 1984.

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