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Output Control of a Negative Voltage Regulation

IP.com Disclosure Number: IPCOM000045410D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Holloway, JF: AUTHOR [+2]

Abstract

Provision is made for the on-off control of a negative voltage regulator in a power supply through the use of variable threshold logic (VTL).

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Output Control of a Negative Voltage Regulation

Provision is made for the on-off control of a negative voltage regulator in a power supply through the use of variable threshold logic (VTL).

The circuit shown includes transistors Q1 - Q5. The input of the circuit is from diode transistor logic-transistor transistor logic (DTL-TTL) that can be driven from any VTL-compatible logic family. Vin-1 and Vin-2 represent multiple input control lines.

The output stage Q5, is an open collector PNP transistor that is tied to the negative voltage output control node 1 normally provided in a negative voltage regulator. Consequently, the output of the negative voltage regulator can be turned on or off by pulling the control node to approximately .5 volt above ground, leaving the output of the regulator at about 0 volts in the off state, if an emitter- follower circuit is used.

The on state of the regulator is its normal output voltage since the PNP transistor of the control circuit is off.

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