Switch-control integrated circuit

Details Switch-control integrated circuit Switch-control integrated circuit

1996-12-30

1998-10-20

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Compensation for variations in external physical values

327434, 327538, 327541, 327513, H03K 17082

Patent

active

058252347

ABSTRACT:
A switch-control integrated circuit for a switch-mode power supply (SMPS) capable of consistently limiting the peak current value of an output supply voltage irrespective of a temperature change. The circuit includes a switching transistor of the SMPS and a sensing resistor coupled to a drain of the switching transistor for sensing a drain current of the switching transistor to produce a peak current value detection voltage. A voltage generating circuit generates a feedback voltage which varies depending on the temperature condition equal to that of the sensing resistor. A comparator compares the temperature dependent voltage, received at a first input, with the temperature dependent peak current value detection voltage, received at a second input, to produce a temperature independent control signal. A protection circuit, coupled between the comparator and the switching transistor, interrupts the control signal if an abnormal operation of the voltage generating section is detected. Finally, a driving circuit drives the switching transistor in response to the control signal transmitted from the protection circuit.

REFERENCES:
patent: 4463274 (1984-07-01), Swartz
patent: 4484331 (1984-11-01), Miller
patent: 5105102 (1992-04-01), Shioda
patent: 5132565 (1992-07-01), Kuzumoto
patent: 5175451 (1992-12-01), Ihara
patent: 5422593 (1995-06-01), Fujihira
patent: 5438545 (1995-08-01), Sim
patent: 5485117 (1996-01-01), Furumochi
patent: 5578960 (1996-11-01), Matsumura et al.

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