JPH01314319A - Constant voltage circuit - Google Patents

Constant voltage circuit

Info

Publication number
JPH01314319A
JPH01314319A JP14626288A JP14626288A JPH01314319A JP H01314319 A JPH01314319 A JP H01314319A JP 14626288 A JP14626288 A JP 14626288A JP 14626288 A JP14626288 A JP 14626288A JP H01314319 A JPH01314319 A JP H01314319A
Authority
JP
Japan
Prior art keywords
voltage
constant voltage
vcout
output
voltage circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP14626288A
Other languages
Japanese (ja)
Inventor
Kazuhiro Izukawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP14626288A priority Critical patent/JPH01314319A/en
Publication of JPH01314319A publication Critical patent/JPH01314319A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To enter a stationary state in a short time by constituting an electric feeding means which supplies a current to between the input and output terminals of the constant voltage circuit by a reference voltage circuit and a transistor (TR) when the voltage at a constant voltage output terminal is smaller than a reference value when a power source is turned on.
CONSTITUTION: Assuming that a capacitor C2 is connected to the output Vcout of the constant voltage circuit, the output Vcout is 0'V' at the moment of the supply of a source voltage Vcc to this constant voltage circuit. The base- emitter voltage VBE of a transistor TR 12 at this time rises enough to make the TR 12 turn on, so while Vcout≤VBE, the TR 12 is on and the capacitor C2 is charged. Then when Vcout>VBE (base-emitter voltage), the TR 12 turns off to output a constant voltage irrelevantly to the voltage comparing circuit composed of diodes D1 and D2, the TR 12, and a constant current source I5. Consequently, the rising time at the time of power-on operation is shortened.
COPYRIGHT: (C)1989,JPO&Japio
JP14626288A 1988-06-14 1988-06-14 Constant voltage circuit Pending JPH01314319A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14626288A JPH01314319A (en) 1988-06-14 1988-06-14 Constant voltage circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14626288A JPH01314319A (en) 1988-06-14 1988-06-14 Constant voltage circuit

Publications (1)

Publication Number Publication Date
JPH01314319A true JPH01314319A (en) 1989-12-19

Family

ID=15403764

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14626288A Pending JPH01314319A (en) 1988-06-14 1988-06-14 Constant voltage circuit

Country Status (1)

Country Link
JP (1) JPH01314319A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5920185A (en) * 1997-01-30 1999-07-06 Nec Corporation Constant-voltage circuit capable of preventing an overshoot at a circuit output terminal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5920185A (en) * 1997-01-30 1999-07-06 Nec Corporation Constant-voltage circuit capable of preventing an overshoot at a circuit output terminal

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