JPS5515511A - Constant current circuit - Google Patents

Constant current circuit

Info

Publication number
JPS5515511A
JPS5515511A JP8717678A JP8717678A JPS5515511A JP S5515511 A JPS5515511 A JP S5515511A JP 8717678 A JP8717678 A JP 8717678A JP 8717678 A JP8717678 A JP 8717678A JP S5515511 A JPS5515511 A JP S5515511A
Authority
JP
Japan
Prior art keywords
constant
current
trq
voltage
emitter
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
JP8717678A
Other languages
Japanese (ja)
Inventor
Yasuo Kominami
Masahiro Yamamura
Katsuharu Mizumoto
Toshihide Hanada
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.)
Hitachi Ltd
Pioneer Corp
Original Assignee
Hitachi Ltd
Pioneer Electronic Corp
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 Hitachi Ltd, Pioneer Electronic Corp filed Critical Hitachi Ltd
Priority to JP8717678A priority Critical patent/JPS5515511A/en
Publication of JPS5515511A publication Critical patent/JPS5515511A/en
Pending legal-status Critical Current

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  • Control Of Electrical Variables (AREA)

Abstract

PURPOSE: To prevent an output current from varying with a power voltage by connecting the emitter of a constant current transistor to its emitter, by providing a Tr to be applied at its base with a constant voltage and by keeping the collector potential of constant current Tr constant.
CONSTITUTION: A constant voltage is developed by resistance R1 and Zener diode 2 of the constant current circuit, and a constant current is generated by the series circuit of resistance R2 applied with this constant voltage, diode-connected transistor RrQ1 and resistance R3. Then, a constant attraction current is obtained from the collector of TrQ2 connecting to the base of this constant current TrQ1 and to resistance R4 at its emitter. The collector voltage is made constant by providing TrQ5 connecting at its emitter to the collector of this TrQ2 and applied at its base with the constant voltage from diode 2. Then, the constant attraction current of TrQ2 is extracted from TrQ3 and Q4 constituting the current Miller circuit to prevent variation in output current caused by variation in power voltage Vcc.
COPYRIGHT: (C)1980,JPO&Japio
JP8717678A 1978-07-19 1978-07-19 Constant current circuit Pending JPS5515511A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8717678A JPS5515511A (en) 1978-07-19 1978-07-19 Constant current circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8717678A JPS5515511A (en) 1978-07-19 1978-07-19 Constant current circuit

Publications (1)

Publication Number Publication Date
JPS5515511A true JPS5515511A (en) 1980-02-02

Family

ID=13907671

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8717678A Pending JPS5515511A (en) 1978-07-19 1978-07-19 Constant current circuit

Country Status (1)

Country Link
JP (1) JPS5515511A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5833016A (en) * 1981-08-21 1983-02-26 Mitsubishi Electric Corp Combustion device
JP2010152566A (en) * 2008-12-24 2010-07-08 Fujitsu Semiconductor Ltd Current producing circuit, current producing method and electronic device
WO2022239563A1 (en) * 2021-05-14 2022-11-17 富士電機株式会社 Integrated circuit and semiconductor module

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5833016A (en) * 1981-08-21 1983-02-26 Mitsubishi Electric Corp Combustion device
JP2010152566A (en) * 2008-12-24 2010-07-08 Fujitsu Semiconductor Ltd Current producing circuit, current producing method and electronic device
WO2022239563A1 (en) * 2021-05-14 2022-11-17 富士電機株式会社 Integrated circuit and semiconductor module

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