JPS556659A - Constant-current circuit - Google Patents
Constant-current circuitInfo
- 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
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56120252A (en) * | 1980-02-27 | 1981-09-21 | Hitachi Ltd | Current supply circuit |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4959250A (en) * | 1972-07-31 | 1974-06-08 | ||
JPS5021246A (en) * | 1973-05-28 | 1975-03-06 |
-
1978
- 1978-06-30 JP JP7947278A patent/JPS556659A/en active Pending
Patent Citations (2)
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)
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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