JPH03211603A - Constant current circuit - Google Patents
Constant current circuitInfo
- Publication number
- JPH03211603A JPH03211603A JP2007439A JP743990A JPH03211603A JP H03211603 A JPH03211603 A JP H03211603A JP 2007439 A JP2007439 A JP 2007439A JP 743990 A JP743990 A JP 743990A JP H03211603 A JPH03211603 A JP H03211603A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- constant current
- current circuit
- emitter
- zener diode
- 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
Landscapes
- Amplifiers (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は半導体集積回路において一般に用いられる定電
流回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a constant current circuit commonly used in semiconductor integrated circuits.
従来の技術
第２図は従来の定電流回路を示す回路図である。従来回
路に於ては、ツェナーダイオードＺＤのカソードに生じ
る電圧Ｖｚ よりＮＰＮ トランジスタＱ１のベース・
エミッタ間電圧ＶＩＩＥＩ だけ電圧降下した電圧がエ
ミッタに生じる為、エミッタ電流はＶｚ Ｖａε１を
エミッタ抵抗Ｒ４で割ったほぼ等しい電流を供給する構
成となっていた。BACKGROUND ART FIG. 2 is a circuit diagram showing a conventional constant current circuit. In the conventional circuit, the voltage Vz generated at the cathode of the Zener diode ZD causes the base of the NPN transistor Q1 to
Since a voltage dropped by the inter-emitter voltage VIIEI is generated at the emitter, the emitter current is configured to supply a current that is approximately equal to Vz Vaε1 divided by the emitter resistance R4.
発明が解決しようとする課題
このような従来の回路では、ツェナーダイオードＺＤに
より生じる電圧ＶＺ、ＮＰＮ）ランジスタＱ１のベース
・エミッタ間電圧ＶＢＥＩ＋ エミッタ抵抗Ｒ４の温度
依存性により、定電流の温度に対する変化を抑えること
ができず、温度依存性の少ない定電流回路を実現できな
い。Problems to be Solved by the Invention In such a conventional circuit, the temperature dependence of the voltage VZ generated by the Zener diode ZD (NPN), the base-emitter voltage VBEI of the transistor Q1 + the emitter resistor R4 makes it difficult to change the constant current with respect to temperature. Therefore, it is impossible to realize a constant current circuit with little temperature dependence.
本発明はかかる点に鑑みてなされたもので温度依存性の
少ない簡易な構成の定電流回路を提供することを目的と
している。The present invention has been made in view of this problem, and it is an object of the present invention to provide a constant current circuit with a simple configuration and less temperature dependence.
課題を解決するための手段
本発明は上記課題を解決するため、定電圧を供給するツ
ェナーダイオード、第１のトランジスタ、電流を決定す
る抵抗に加え、温度特性補償用の第２のトランジスタと
第２．第３の抵抗を第１のトランジスタのエミッタと電
流を決定する抵抗との間に挿入した構成の定電流回路で
ある。Means for Solving the Problems In order to solve the above problems, the present invention provides, in addition to a Zener diode for supplying a constant voltage, a first transistor, and a resistor for determining current, a second transistor for temperature characteristic compensation and a second transistor for temperature characteristic compensation. ．． This is a constant current circuit having a configuration in which a third resistor is inserted between the emitter of the first transistor and a resistor that determines the current.
作用
本発明は上記した構成により、ツェナーダイオード電圧
、トランジスタのベース・エミッタ間電圧、電流決定用
の抵抗を持つ温度依存性に対し、第２．第３の抵抗の比
を調整することにより温度依存性の少ない簡易な構成の
定電流回路が実現できる。Effects The present invention has the above-described configuration, so that the temperature dependence of the Zener diode voltage, the base-emitter voltage of the transistor, and the resistance for determining the current can be controlled by the second. By adjusting the ratio of the third resistors, a constant current circuit with a simple configuration with little temperature dependence can be realized.
実施例
第１図は本発明の定電流回路の実施例を示す回路図であ
る。第１図に於てＺＤはツェナーダイオード、Ｑｌ、Ｑ
２はＮＰＮトランジスタ、Ｒ１はツェナーダイオードＺ
Ｄ、ＮＰＮ）ランジスタＱ１を駆動する為の抵抗、Ｒ２
，Ｒ３は温度特性補償用の抵抗、Ｒ４は電流値を決定す
る抵抗である。Embodiment FIG. 1 is a circuit diagram showing an embodiment of the constant current circuit of the present invention. In Figure 1, ZD is a Zener diode, Ql, Q
2 is an NPN transistor, R1 is a Zener diode Z
D, NPN) Resistor for driving transistor Q1, R2
, R3 are resistors for temperature characteristic compensation, and R4 is a resistor that determines the current value.
ツェナーダイオード電圧をＶｚ、ＮＰＮ）ランジスタＱ
ｌ、Ｑ２のベース・エミ・ツタ間電圧を■ＢＥｌ＋ ｖ
ＢＥ２、−！！−！−Ｌ−１とするとＮＰＮトランシタ
１＋ｈｐＥ
りＱｌのコレクタより供給される電流ｒｃはで表され、
ＶｌｌＥｌ”ＶＢＥ２ｓｌＶ［ｌＥであるのでｄＩ・は
となる。この式よりＩｃの温度変化 ｄＴ皿、１ ｃ匹
−（２＋−３’二）１軒
ｄＴ Ｒ４ｄＴ Ｒ３
１１、、１ｄＲ＋
”（（２＋ Ｒ「）■ａｇ−ｖｚＥ Ｒ，・ｄＴ ）
となる。シリコン基板に於いてツェナーダイオード電圧
Ｖｚは約６Ｖ、ＮＰＮトランジスタのベース・エミッタ
間電圧は約Ｑ、ＴＶ、Ｖｚの温度変化前述の式、
右辺の係数
にすれば良い。Zener diode voltage Vz, NPN) transistor Q
The voltage between the base and emitter of l and Q2 is ■BEl+ v
BE2,-! ! -! -L-1, the current rc supplied from the collector of NPN transistor 1+hpE riQl is expressed as,
VllEl"VBE2slV[lE, so dI・is. From this formula, the temperature change of Ic dT dish, 1 c animals - (2+-3'2) 1 house dT R4dT R3 11,, 1dR+" ((2+ R" )■ag-vzE R,・dT)
becomes. In the silicon substrate, the Zener diode voltage Vz is about 6V, the base-emitter voltage of the NPN transistor is about Q, TV, and the temperature change of Vz.The coefficient on the right side of the above equation can be used.
上式に定数を代入すると、 Ｘ１０ ’−（２＋−’−’−）Ｘ２Ｘ１０−’３ となるので の少ない簡易な構成の定電流回路が実現できる。Substituting a constant into the above formula, we get X10 '-(2+-'-'-)X2X10-'3 So It is possible to realize a constant current circuit with a simple configuration with few.
発明の効果
以上述べたように本発明に於て温度依存性の少ない簡易
な構成の定電流回路が実現でき、実用的に極めて有用で
ある。Effects of the Invention As described above, according to the present invention, a constant current circuit having a simple structure with little temperature dependence can be realized, and is extremely useful in practice.
第１図は本発明の定電流回路の一実施例を示す回路図、
第２図は従来の定電流回路の回路図である。
Ｑｌ、Ｑ２・・・・・・ＮＰＮトランジスタ、ｚＤ・・
・・・・ツェナーダイオード、Ｒ１−Ｒ４・・・・・・
抵抗、Ｉ ｃ −・・・供給定電流、１・・・・・・電
源電圧端子、２・・・・・・接地端子、３・・・・・・
電流供給端子。FIG. 1 is a circuit diagram showing an embodiment of the constant current circuit of the present invention,
FIG. 2 is a circuit diagram of a conventional constant current circuit. Ql, Q2...NPN transistor, zD...
...Zener diode, R1-R4...
Resistance, I c -... Supply constant current, 1... Power supply voltage terminal, 2... Ground terminal, 3...
Current supply terminal.
Claims (1)
およびツェナーダイオードと、ベースが上記第１の抵抗
とツェナーダイオードの接続点に接続され、コレクタが
電流供給端子に接続された第１のトランジスタと、上記
第１のトランジスタのエミッタと上記第２の電源端子の
間に直列に接続された第２、第３、第４の抵抗と、コレ
クタ、ベース、エミッタが上記第１のトランジスタのエ
ミッタと上記第２の抵抗の接続点、上記第２、第３の抵
抗の接続点、上記第３、第４の抵抗の接続点にそれぞれ
接続された上記第１のトランジスタと同極性の第２のト
ランジスタとを備えた定電流回路。A first resistor and a Zener diode are connected in series between the first and second power supply terminals, the base is connected to the connection point of the first resistor and the Zener diode, and the collector is connected to the current supply terminal. a first transistor; second, third, and fourth resistors connected in series between the emitter of the first transistor and the second power supply terminal; and a collector, a base, and an emitter of the first transistor. A transistor having the same polarity as the first transistor connected to the connection point between the emitter of the transistor and the second resistor, the connection point between the second and third resistors, and the connection point between the third and fourth resistors, respectively. A constant current circuit comprising a second transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007439A JPH03211603A (en) | 1990-01-17 | 1990-01-17 | Constant current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007439A JPH03211603A (en) | 1990-01-17 | 1990-01-17 | Constant current circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03211603A true JPH03211603A (en) | 1991-09-17 |
Family
ID=11665893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2007439A Pending JPH03211603A (en) | 1990-01-17 | 1990-01-17 | Constant current circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03211603A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05122930A (en) * | 1991-10-29 | 1993-05-18 | Nec Kansai Ltd | Driving power supply for capacitive element |
| JP2006277360A (en) * | 2005-03-29 | 2006-10-12 | Fujitsu Ltd | Constant current circuit and constant current generation method |
-
1990
- 1990-01-17 JP JP2007439A patent/JPH03211603A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05122930A (en) * | 1991-10-29 | 1993-05-18 | Nec Kansai Ltd | Driving power supply for capacitive element |
| JP2006277360A (en) * | 2005-03-29 | 2006-10-12 | Fujitsu Ltd | Constant current circuit and constant current generation method |
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