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JPH02242309A - Voltage control circuit - Google Patents

Voltage control circuit

Info

Publication number
JPH02242309A
JPH02242309A JP1063164A JP6316489A JPH02242309A JP H02242309 A JPH02242309 A JP H02242309A JP 1063164 A JP1063164 A JP 1063164A JP 6316489 A JP6316489 A JP 6316489A JP H02242309 A JPH02242309 A JP H02242309A
Authority
JP
Japan
Prior art keywords
voltage
transistor
control circuit
output
terminal
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
JP1063164A
Other languages
Japanese (ja)
Inventor
Sadayuki Shimoda
貞之 下田
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.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
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 Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP1063164A priority Critical patent/JPH02242309A/en
Publication of JPH02242309A publication Critical patent/JPH02242309A/en
Pending legal-status Critical Current

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  • Continuous-Control Power Sources That Use Transistors (AREA)
  • Dram (AREA)

Abstract

PURPOSE:To switch a binary output voltage without causing a voltage drop by connecting in parallel a transistor to a part of a feedback resistance, and bringing the transistor to ON/OFF control. CONSTITUTION:A voltage Vin inputted from an input terminal 1 passes through a control use MOS transistor 7 through an amplifier 11, and outputted to an output terminal 4. To the output terminal 4, feedback resistances 8, 9 and 10 are connected, and a transistor 13 is connected in parallel to the feedback resistance 10. When the transistor 13 is turned on and off through an input circuit 14 in accordance with an input to a terminal 2, since a feedback rate to the amplifier 11 is different, an output voltage can be switched to two kinds.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、モノリシックIC化された電圧制御回路に関
するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a voltage control circuit formed into a monolithic IC.

〔発明の概要〕[Summary of the invention]

本発明は、1つの電圧制御回路で異なる2つの電圧を外
部信号によって切り換えることができるものであり、電
圧制御回路の帰還抵抗の一部にトランジスタを並列に付
加し、かつ該トランジスタのゲートには、入力回路を接
続し外部からの制御信号によって該トランジスタのON
・OFFを76117卸できるものである。
The present invention allows one voltage control circuit to switch between two different voltages using an external signal, and a transistor is added in parallel to a part of the feedback resistor of the voltage control circuit, and a gate of the transistor is connected to the feedback resistor of the voltage control circuit. , the input circuit is connected and the transistor is turned on by an external control signal.
・You can wholesale 76117 OFF.

〔従来の技術〕[Conventional technology]

従来の電圧側m回路の回路図を第2図に示す。 A circuit diagram of a conventional voltage-side m-circuit is shown in FIG.

入力端子lからの入力端子Vinは、電圧制御回路Aと
電圧制御回路已に印加される。ここで、電圧制御回路A
、B(7)出力電圧V、、’V、には、vA〈V、の関
係があるものとする。また、電圧制御回路Bの入力端子
には、端子2から入力端子される外部からの制御信号に
応じて、入力端子1と電圧制御回路Bの入力端子との接
続を0N−OFFさせることができるコントロール回路
3が挿入されている。例えば、端子2をLowレベルに
しておけば、入力端子lと電圧制御回路Bの入力端子と
の間は、電気的に切断され電圧IIl jn rgJ路
Bの出力端子には、■馬なる電圧は発生しない。したが
って出力端子4には、ダイオード5を通して、電圧制御
回路Aの出力電圧VA  Q、5vの電圧が出る。
The input terminal Vin from the input terminal l is applied to the voltage control circuit A and the voltage control circuit. Here, voltage control circuit A
,B(7) It is assumed that the output voltages V, ,'V, have the relationship vA<V. Furthermore, the connection between the input terminal 1 and the input terminal of the voltage control circuit B can be turned ON or OFF according to an external control signal inputted from the terminal 2 to the input terminal of the voltage control circuit B. A control circuit 3 is inserted. For example, if terminal 2 is set to Low level, the input terminal l and the input terminal of voltage control circuit B are electrically disconnected, and the voltage IIl jn rgJ is output to the output terminal of path B. Does not occur. Therefore, the output voltage VAQ of the voltage control circuit A, 5V, is outputted to the output terminal 4 through the diode 5.

逆に端子2をHi g hレヘルにすれば、入力端子1
と電圧制御回路Bの入力端子との間は、電気的に接続さ
れるので電圧制御回路Bの出力端子にはV8の電圧が発
生し、かつV、<V、の関係よりダイオード6を通して
Vs −0,6vの電圧が出力端子4に出力される。該
ダイオード5.6は逆流防止のため設けられている。
Conversely, if you set terminal 2 to High level, input terminal 1
and the input terminal of the voltage control circuit B are electrically connected, so a voltage of V8 is generated at the output terminal of the voltage control circuit B, and Vs − is generated through the diode 6 due to the relationship of V,<V. A voltage of 0.6v is output to the output terminal 4. The diode 5.6 is provided to prevent backflow.

以上のように、従来の電圧制御回路で異なる2つの電圧
を、外部信号によって切り換えて、出力させようとする
と、2つの電圧制御回路と2つのダイオードが必要であ
り、かつ出力端子4にはダイオード1個分の電圧降下を
持った電圧しか出力されないという欠点がある。
As described above, if you try to switch and output two different voltages using an external signal using a conventional voltage control circuit, two voltage control circuits and two diodes are required, and a diode is connected to output terminal 4. The drawback is that only a voltage with a voltage drop of one voltage is output.

〔課題を解決するための手段〕[Means to solve the problem]

本発明は、従来の技術の課題を解決することを目的とし
、1つの電圧制御回路でダイオード1個分の電圧降下が
なく、2つの出力電圧を外部信号によって切り換えるこ
とができる構成とした。
The present invention aims to solve the problems of the conventional technology, and has a configuration in which one voltage control circuit does not have the voltage drop of one diode and can switch between two output voltages by an external signal.

具体的には、1つの電圧制御回路の帰還抵抗の一部に並
列にトランジスタを設け、外部制御信号を入力回路で受
は内部の電源電圧に変換した制御信号によって、該トラ
ンジスタをON・OFF制御することによって、出力電
圧を切り換える。
Specifically, a transistor is provided in parallel with a part of the feedback resistor of one voltage control circuit, and the input circuit receives an external control signal and converts the transistor into an internal power supply voltage.The transistor is then turned on and off by the control signal. The output voltage is switched by

〔実施例〕〔Example〕

以下、図面に従って本発明の実施例を詳細に説明する。 Embodiments of the present invention will be described in detail below with reference to the drawings.

第1図は、本発明による切り換え可能な電圧制御σ回路
図である。入力端子lから人力された電圧Vinは、制
御用MOSトランジスタ7を通り、出力端子4に出力さ
れる。出力5jM子4には帰還抵抗8.9と10が接続
され、帰還抵抗日、9の接続点の電圧は増幅器11の正
入力端子に入力される。
FIG. 1 is a switchable voltage control σ circuit diagram according to the present invention. A voltage Vin manually applied from the input terminal l passes through the control MOS transistor 7 and is output to the output terminal 4. Feedback resistors 8.9 and 10 are connected to the output terminal 4, and the voltage at the connection point of the feedback resistors 9 and 9 is input to the positive input terminal of the amplifier 11.

方、増幅器11の負入力端子には基準電圧12が入力さ
れている。また、増幅器11の出力端子は制御用トラン
ジスタ7のゲートに接続されている。抵抗10の両端に
は、トランジスタ13が並列に挿入され、そのゲートに
はCMOSトランジスタで構成された入力回路14を介
して端子2に接続されている。
On the other hand, a reference voltage 12 is input to the negative input terminal of the amplifier 11. Further, the output terminal of the amplifier 11 is connected to the gate of the control transistor 7. A transistor 13 is inserted in parallel between both ends of the resistor 10, and its gate is connected to the terminal 2 via an input circuit 14 made up of a CMOS transistor.

本回路の動作原理は、抵抗8と9の接続点の電圧が、基
準電圧12と等しくなるように増幅器11の出力が制御
用トランジスタ17のON抵抗を制御することによって
出力端子4の出力電圧■。、を−定に保つようにする。
The operating principle of this circuit is that the output of the amplifier 11 controls the ON resistance of the control transistor 17 so that the voltage at the connection point of the resistors 8 and 9 becomes equal to the reference voltage 12, so that the output voltage of the output terminal 4 becomes . , is kept constant.

出力電圧■。、は式filで表わされる。Output voltage ■. , is expressed by the formula fil.

ここで、V□Cは基準電圧12の電圧、RAは抵抗8、
R,は抵抗9.R6は抵抗10のそれぞれの抵抗値であ
る。今、端子2に外部から、例えばTTL信号のHig
hレヘルが入力されると、入力回路14を通して、内部
電源Vinに変換された信号がトランジスタ13のゲー
トに入力され、トランジスタ13はONする。この結果
、抵抗10はトランジスタ13によって短絡させられる
ため、出力電圧■。、。
Here, V□C is the voltage of the reference voltage 12, RA is the resistor 8,
R, is resistance 9. R6 is the resistance value of each resistor 10. Now, connect terminal 2 from the outside with, for example, a high TTL signal.
When h level is input, a signal converted to the internal power supply Vin is input to the gate of the transistor 13 through the input circuit 14, and the transistor 13 is turned on. As a result, the resistor 10 is short-circuited by the transistor 13, so the output voltage becomes ■. ,.

は式(1)より、 になる。一方、端子2に外部から、例えばTTL信号の
LOWレヘルが入力されると、入力回路14を通して内
部電源の接地電位に変換された信号がトランジスタ13
をOFFさせ、その結果、出力電圧V ouL2は弐(
1)で表わされる値になる。出力電圧V 0uLlとV
o u L 2を比較すると、VOIILI > V6
11LZ117)関係がある。
From equation (1), it becomes. On the other hand, when a LOW level of a TTL signal, for example, is input from the outside to the terminal 2, the signal converted to the ground potential of the internal power supply through the input circuit 14 is transmitted to the transistor 13.
As a result, the output voltage V ouL2 becomes 2(
1). Output voltage V 0uLl and V
Comparing o u L 2, VOIILI > V6
11LZ117) There is a relationship.

〔発明の効果〕〔Effect of the invention〕

以上述べたように本発明によれば、帰還抵抗の一部にト
ランジスタを並列に接続し、該トランジスタのゲートに
、入力回路を通して外部制御13号を印加して、該トラ
ンジスタをON・O,FF制御することによって、ダイ
オード等による電圧降下なしで、かつ1つの電圧制御回
路で2値の出力電圧を切り換えて出力させることができ
る低コストの電圧制御回路を実現することができる。
As described above, according to the present invention, a transistor is connected in parallel to a part of the feedback resistor, and external control No. 13 is applied to the gate of the transistor through the input circuit to turn the transistor ON/O, FF. By controlling the voltage, it is possible to realize a low-cost voltage control circuit that can switch and output a binary output voltage with one voltage control circuit without voltage drop due to a diode or the like.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の電圧制御回路図、第2図は従来の電圧
制御回路図である。 8.9.10・・・帰還抵抗 7.1.・・・・・MOS)ランジスク以上 出願人 セイコー電子工業株式会社 代理人 弁理士 林  敬 之 助
FIG. 1 is a voltage control circuit diagram of the present invention, and FIG. 2 is a conventional voltage control circuit diagram. 8.9.10...Feedback resistance 7.1. ...MOS) Applicant above Landisk Seiko Electronic Industries Co., Ltd. Agent Patent attorney Keinosuke Hayashi

Claims (1)

【特許請求の範囲】[Claims] 制御トランジスタと帰還抵抗と基準電圧と増幅器からな
るCMOSトランジスタによるモノリシックIC化され
た電圧制御回路において、前記帰還抵抗の一部に並列に
MOSトランジスタを配置し、該MOSトランジスタの
ゲート電圧を外部から制御することを特徴とした電圧制
御回路。
In a monolithic IC voltage control circuit using a CMOS transistor consisting of a control transistor, a feedback resistor, a reference voltage, and an amplifier, a MOS transistor is placed in parallel with a part of the feedback resistor, and the gate voltage of the MOS transistor is externally controlled. A voltage control circuit characterized by:
JP1063164A 1989-03-15 1989-03-15 Voltage control circuit Pending JPH02242309A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1063164A JPH02242309A (en) 1989-03-15 1989-03-15 Voltage control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1063164A JPH02242309A (en) 1989-03-15 1989-03-15 Voltage control circuit

Publications (1)

Publication Number Publication Date
JPH02242309A true JPH02242309A (en) 1990-09-26

Family

ID=13221329

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1063164A Pending JPH02242309A (en) 1989-03-15 1989-03-15 Voltage control circuit

Country Status (1)

Country Link
JP (1) JPH02242309A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6753721B2 (en) 2001-09-19 2004-06-22 Oki Electric Industry Co., Ltd. Internal step-down power supply circuit
JP2012185709A (en) * 2011-03-07 2012-09-27 Denso Corp Electric power supply

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6753721B2 (en) 2001-09-19 2004-06-22 Oki Electric Industry Co., Ltd. Internal step-down power supply circuit
US6885237B2 (en) 2001-09-19 2005-04-26 Oki Electric Industry Co., Ltd. Internal step-down power supply circuit
US7034605B2 (en) 2001-09-19 2006-04-25 Oki Electric Industry Co., Ltd. Internal step-down power supply circuit
JP2012185709A (en) * 2011-03-07 2012-09-27 Denso Corp Electric power supply

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