JPS61120219A - Constant voltage circuit - Google Patents
Constant voltage circuitInfo
- Publication number
- JPS61120219A JPS61120219A JP24289984A JP24289984A JPS61120219A JP S61120219 A JPS61120219 A JP S61120219A JP 24289984 A JP24289984 A JP 24289984A JP 24289984 A JP24289984 A JP 24289984A JP S61120219 A JPS61120219 A JP S61120219A
- Authority
- JP
- Japan
- Prior art keywords
- constant voltage
- transistor
- voltage
- emitter
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
- G05F3/02—Regulating voltage or current
- G05F3/08—Regulating voltage or current wherein the variable is dc
- G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
- G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
- G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
- G05F3/26—Current mirrors
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Nonlinear Science (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Control Of Electrical Variables (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、集積回路化に好適な定電圧回路に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a constant voltage circuit suitable for integration into an integrated circuit.
従来例の構成とその問題点
従来、電源電圧に依存しない定電圧素子としてツェナー
ダイオードが広く用いられていたが、近年、集積回路の
低電圧化に伴ない、ツェナーダイオードの使用が困難に
なってきた。これに代わるものとして、第１図に示すよ
うな、トランジスタのベース・エミッタ電圧を利用した
定電圧回路が用いられる。以下、トランジスタのベース
・エミッタ電圧を用いた定電圧回路について説明する。Conventional configurations and their problems Traditionally, Zener diodes have been widely used as constant voltage elements that do not depend on the power supply voltage, but in recent years, as the voltage of integrated circuits has become lower, it has become difficult to use Zener diodes. Ta. As an alternative to this, a constant voltage circuit using the base-emitter voltage of a transistor as shown in FIG. 1 is used. A constant voltage circuit using the base-emitter voltage of a transistor will be described below.
第１図において、１は電流源、２は定電圧出力端子、３
は接地端子、４はＮＰＮトランジスタ、５．６は抵抗で
ある。いま、抵抗５，６の値をそれぞれＲ１、Ｒ２、ト
ランジスタ４のベース、エミッタ電圧を”ＢＥとすると
、出力端子の電圧Ｖ。はｖｏ＝〔（Ｒ４＋Ｒ２）／Ｒ２
〕×ｖＢＥとなる。一方、■ＢＥは、電流源の電流値に
対する依存性が小さい（電流値が２倍になった時、約１
７ｍｖ増加する）ため、出力端子の電圧もほぼ一定電圧
となり、この結果、第１図の回路は定電圧回路として動
作する。In Figure 1, 1 is a current source, 2 is a constant voltage output terminal, and 3 is a current source.
is a ground terminal, 4 is an NPN transistor, and 5.6 is a resistor. Now, if the values of resistors 5 and 6 are R1 and R2, and the base and emitter voltages of transistor 4 are BE, then the voltage at the output terminal V is vo=[(R4+R2)/R2
]×vBE. On the other hand, ■BE has a small dependence on the current value of the current source (when the current value doubles, approximately 1
7 mv), the voltage at the output terminal also becomes a substantially constant voltage, and as a result, the circuit shown in FIG. 1 operates as a constant voltage circuit.
しかしながら、上記の回路では、トランジスタのベース
・エミッタ電圧■ＢＥが、 １．Ｂｍｖ／ｄｏｇの温
度依存性をもつため、定電圧回路の出力電圧も、−１、
８Ｘ （Ｒ，＋Ｒ２）／Ｒ２ｍｖ／ｄｅｑの温度依存性
をもち、出力電圧の温度特性が悪いという問題点を有し
ていた。However, in the above circuit, the base-emitter voltage ■BE of the transistor is 1. Since it has a temperature dependence of Bmv/dog, the output voltage of the constant voltage circuit is also -1,
It has a temperature dependence of 8X (R, +R2)/R2mv/deq, and has a problem in that the temperature characteristics of the output voltage are poor.
発明の目的
本発明は、上記従来の問題点を解決するもので、ツェナ
ーダイオードより低い電圧で使用でき、しかも電圧の温
度依存性の小さな定電圧回路を提供することを目的とす
る。OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims to provide a constant voltage circuit that can be used at a lower voltage than a Zener diode and has less temperature dependence of voltage.
発明の構成
本発明は、電流源が接続された定電圧出力端子にエミッ
タを接続し、ベースとコレクタを共通接続り、を第１の
ＰＮＰ トランジスタのベース奮、同じくエミッタを定
電圧出力端子に接続した第２のＰＮＰＩ−ランジスタの
ベースに接続するとともにエミＪりを接地し、ベースと
コレクタを共通接続した第１のＮＰＮ ｌ−ランジスタ
のベース奮、他端を接地した第１の抵抗にエミッタを接
続した、前記第１のＮＰＮ トランジスタよりエミッタ
面積の大きい第２のＮＰＮトランジスタのベースに接続
し、かつ前記第１のＰＮＰ トランジスタのコレクタを
第２の抵抗を経由して第２のＮＰＮトランジスタのコレ
クタに接続し、第２のＰＮＰトランジスタのコレクタを
第１のＮＰＮ トランジスタのコレクタに接続した構成
を具備し、かつ、エミッタを接地し、ベースを前記第２
のＮＰＮ トランジスタのコレクタに接続し、コレクタ
を定電圧出力端２．４ｖで温度依存性の小さい定電圧回
路を実現で（きる。Structure of the Invention The present invention connects the emitter to a constant voltage output terminal connected to a current source, connects the base and collector in common, connects the base of the first PNP transistor, and also connects the emitter to the constant voltage output terminal. The base of the first NPN l-transistor, whose base and collector are commonly connected, is connected to the base of the second PNPI-transistor, and the emitter is connected to the first resistor, whose other end is grounded. connected to the base of a second NPN transistor having a larger emitter area than the first NPN transistor, and connecting the collector of the first PNP transistor to the collector of the second NPN transistor via a second resistor. The collector of the second PNP transistor is connected to the collector of the first NPN transistor, the emitter is grounded, and the base is connected to the second NPN transistor.
It is possible to realize a constant voltage circuit with small temperature dependence by connecting the collector to the collector of an NPN transistor and connecting the collector to the constant voltage output terminal of 2.4V.
実施例の説明
第２図に、本発明による定電圧回路の回路例を示す。図
において、１は電流源、２は定電圧出力端子、３は接地
端子、４はＮＰＮ トランジスタ、７．８はエミッタ面
積の等しいＰＮＰ トランジスタ、１０はＮＰＮ トラ
ンジスタ、１１はエミッタ面積の大きなＮＰＮトランジ
スタ、９．１２は抵抗である。DESCRIPTION OF EMBODIMENTS FIG. 2 shows a circuit example of a constant voltage circuit according to the present invention. In the figure, 1 is a current source, 2 is a constant voltage output terminal, 3 is a ground terminal, 4 is an NPN transistor, 7.8 is a PNP transistor with equal emitter area, 10 is an NPN transistor, 11 is an NPN transistor with a large emitter area, 9.12 is resistance.
以上のように構成された本実施例の定電圧回路について
、以下第２図の回路図にもとづいてその動作を説明する
。The operation of the constant voltage circuit of this embodiment configured as described above will be explained below based on the circuit diagram of FIG. 2.
第２図において、トランジスタ１ｏとトランジスタ１１
のエミッタ面積の比をｎ１抵抗１２の抵抗１直をＲ３と
すると、トランジスタ１１のコレクタ電流は下のように
表わされる。In FIG. 2, transistor 1o and transistor 11
The collector current of the transistor 11 is expressed as below, assuming that the emitter area ratio of n1 is R3, and the resistor 1 of the resistor 12 is R3.
Ｉｃ ＝ ｋＴ −ｌ１ｎ（ｎ）／Ｒ３（ｋはボルツ
マン定数、Ｔは絶対温度）一方、トランジスタ８のベー
ス・エミッタ電圧１をｖＢＥｌ、抵抗９の抵抗値をＲ４
、トランジスタ４のベース・エミッタ電圧をｖＢＥ と
すると、出力端子２の電圧Ｖ。は、下記のようになる。Ic = kT -l1n(n)/R3 (k is Boltzmann constant, T is absolute temperature) On the other hand, the base-emitter voltage 1 of transistor 8 is vBEl, and the resistance value of resistor 9 is R4
, when the base-emitter voltage of transistor 4 is vBE, the voltage at output terminal 2 is V. is as follows.
Ｖ口 ＝ ＶＢＥ １＋ｒ ｃＸＲ４＋ＶＢＥここで、
上式の第１項、第２項は、電流源の電流値にほとんど依
存せず、第３項も電流値に対する依存性が小さいため、
出力電圧もほぼ一定電圧となる。V mouth = VBE 1+r cXR4+VBE where,
The first and second terms in the above equation hardly depend on the current value of the current source, and the third term also has a small dependence on the current value, so
The output voltage is also approximately constant.
次に、本実施例の回路の温度特性について検討する。出
力電圧の温度係数は、
ここで、
となるので、Ｔｍ２Ｏ３°に１■ＢＥ１＝ｖＢＥ＝７０
０ｍＶとすれば、Ｖ□ ：２４００ ｍＶすなわち、本
実施例の定電圧回路の出力電圧は約２．４■である。Next, the temperature characteristics of the circuit of this example will be discussed. The temperature coefficient of the output voltage is here, so Tm2O3° is 1■BE1=vBE=70
Assuming 0 mV, V□: 2400 mV, that is, the output voltage of the constant voltage circuit of this embodiment is approximately 2.4□.
発明の効果
本発明は、バンドギャップ型の定電流回路とトランジス
タのペース・エミッタ電圧を組み合わせることにより、
定電圧値が約２．４ｖと低く、シかも温度依存性の小さ
い定電圧回路を実現できるものである。Effects of the Invention The present invention combines a bandgap type constant current circuit and a transistor's pace emitter voltage.
It is possible to realize a constant voltage circuit with a low constant voltage value of about 2.4 V and low temperature dependence.
第１図は従来のトランジスタのベース・エミッタ電圧を
用いた定電圧回路の回路図、第２図は本発明の実施例に
おける定電圧回路の回路図である。
１・・・・・・電流源、２・・・・・・定電圧出力端子
、３・・・・・・接地端子、４，１０．１１・・・・・
・ＮＰＮトランジスタ、７，８・・・・・・ＰＮＰ ト
ランジスタ、！、６，９゜１２・・・・・・抵抗。
代理人の氏名 弁理士 中 尾 歓 男 ほか１名第１
図FIG. 1 is a circuit diagram of a conventional constant voltage circuit using the base-emitter voltage of a transistor, and FIG. 2 is a circuit diagram of a constant voltage circuit according to an embodiment of the present invention. 1... Current source, 2... Constant voltage output terminal, 3... Ground terminal, 4, 10.11...
・NPN transistor, 7, 8...PNP transistor,! , 6,9°12... Resistance. Name of agent: Patent attorney Ken Nakao and 1 other person 1st
figure
Claims (1)
続した第１、第２のＰＮＰトランジスタのエミッタをそ
れぞれ接続し、且つ、ベースを共通接続した第１のＮＰ
Ｎトランジスタおよび第１のＮＰＮトランジスタよりエ
ミッタ面積の大きい第２のＮＰＮトランジスタのコレク
タに、上記第１、第２のＰＮＰトランジスタのコレクタ
を、それぞれ直接および抵抗を介して接続し、他方、エ
ミッタを直接および抵抗を介して接地し、且つ、前記第
２のＰＮＰトランジスタ、および前記第１のＮＰＮトラ
ンジスタのベース・コレクタを共通接続となし、また、
エミッタ接地した第３のＮＰＮトランジスタのベースを
前記第２のＮＰＮトランジスタのコレクタに接続し、且
つコレクタを定電圧端子に接続したことを特徴とする定
電圧回路。The emitters of the first and second PNP transistors whose bases are commonly connected are connected to the constant voltage output terminal to which the current source is connected, and the first NP transistor whose bases are commonly connected.
The collectors of the first and second PNP transistors are connected directly and through a resistor, respectively, to the collectors of the second NPN transistor whose emitter area is larger than that of the N transistor and the first NPN transistor, and the emitters are connected directly. and grounded via a resistor, and the bases and collectors of the second PNP transistor and the first NPN transistor are connected in common, and
A constant voltage circuit characterized in that a base of a third NPN transistor whose emitter is grounded is connected to a collector of the second NPN transistor, and the collector is connected to a constant voltage terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24289984A JPS61120219A (en) | 1984-11-16 | 1984-11-16 | Constant voltage circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24289984A JPS61120219A (en) | 1984-11-16 | 1984-11-16 | Constant voltage circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61120219A true JPS61120219A (en) | 1986-06-07 |
| JPH0556531B2 JPH0556531B2 (en) | 1993-08-19 |
Family
ID=17095870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24289984A Granted JPS61120219A (en) | 1984-11-16 | 1984-11-16 | Constant voltage circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61120219A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4674947B2 (en) * | 2000-09-29 | 2011-04-20 | オリンパス株式会社 | Constant voltage output circuit |
-
1984
- 1984-11-16 JP JP24289984A patent/JPS61120219A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4674947B2 (en) * | 2000-09-29 | 2011-04-20 | オリンパス株式会社 | Constant voltage output circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0556531B2 (en) | 1993-08-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |