JPS556659A - Constant-current circuit - Google Patents

Constant-current circuit

Info

Publication number
JPS556659A
JPS556659A JP7947278A JP7947278A JPS556659A JP S556659 A JPS556659 A JP S556659A JP 7947278 A JP7947278 A JP 7947278A JP 7947278 A JP7947278 A JP 7947278A JP S556659 A JPS556659 A JP S556659A
Authority
JP
Japan
Prior art keywords
trq
constant
current
2vbe
trs
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
JP7947278A
Other languages
Japanese (ja)
Inventor
Hiroyasu Yamaguchi
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP7947278A priority Critical patent/JPS556659A/en
Publication of JPS556659A publication Critical patent/JPS556659A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To obtain excellent characteristics by making operation down to a low voltage possible by eliminating the dependency of a power voltage while simplifying IC-implementation, by improving the negative feedback circuit of a constant-current circuit.
CONSTITUTION: Transistor Q3 constituting the constant-current circuit supplies a constant current to series diodes D1 and D2 to bias the base potential of TrQ1 to a constant value and TrQ4 applies biasses of TrQ3 and Trs Q5 and Q7. In this case, a current is flowed to resistance R2 by TrQ5 and the base potential of TrQ2 is nearly equalized to that of TrQ1 by the negative feedback circuit composed of Trs Q1, Q4 and Q5. Then, the collector current of TrQ5 is made equal to 2VBE/B2 (provided that 2VBE is the forward potential of diodes D1 and D2) and collector- emitter voltages of Trs Q3 and Q5 are nearly equalized and held at VGE; and the influence of the power voltage on potential 2VBE of diodes D1 and D2 is eliminated, thereby improving constant-current characteristics.
COPYRIGHT: (C)1980,JPO&Japio
JP7947278A 1978-06-30 1978-06-30 Constant-current circuit Pending JPS556659A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7947278A JPS556659A (en) 1978-06-30 1978-06-30 Constant-current circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7947278A JPS556659A (en) 1978-06-30 1978-06-30 Constant-current circuit

Publications (1)

Publication Number Publication Date
JPS556659A true JPS556659A (en) 1980-01-18

Family

ID=13690823

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7947278A Pending JPS556659A (en) 1978-06-30 1978-06-30 Constant-current circuit

Country Status (1)

Country Link
JP (1) JPS556659A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56120252A (en) * 1980-02-27 1981-09-21 Hitachi Ltd Current supply circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4959250A (en) * 1972-07-31 1974-06-08
JPS5021246A (en) * 1973-05-28 1975-03-06

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4959250A (en) * 1972-07-31 1974-06-08
JPS5021246A (en) * 1973-05-28 1975-03-06

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56120252A (en) * 1980-02-27 1981-09-21 Hitachi Ltd Current supply circuit
JPH0247765B2 (en) * 1980-02-27 1990-10-22 Hitachi Ltd

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