Electricity: power supply or regulation systems – Input level responsive – Using a linearly acting final control device
Patent
1993-11-12
1995-11-28
Wong, Peter S.
Electricity: power supply or regulation systems
Input level responsive
Using a linearly acting final control device
323274, 323281, 323284, G05F 500
Patent
active
054711304
ABSTRACT:
A power supply controller includes a comparator for providing a regulated voltage when an input voltage exceeds a reference voltage, so that a reference voltage is provided to drive a load discharge circuit. When the input voltage is less than the reference voltage, such as during a startup or sleep mode of operation of the controller, the load discharge circuit is driven by an output pulldown circuit so as to maintain minimum functions within the integrated circuit of the controller including turnoff of an external MOSFET. The output pulldown circuit senses the resulting absence of the regulated voltage using a first transistor coupled to be biased into nonconduction when the regulated voltage is not provided. This biases a second transistor into conduction to maintain a transistor within the load discharge circuit conductive. In this manner, the output powers its own operation, including the pulldown thereof. The controller enables a relatively small startup current to be used, utilizes multiple outputs, and eliminates temperature dependence of the startup current.
REFERENCES:
patent: 4792747 (1988-12-01), Schroeder
Han Jessica
Linfinity Microelectronics Inc.
Wong Peter S.
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