JPH0447718U

JPH0447718U -

Info

Publication number: JPH0447718U
Application number: JP9008090U
Authority: JP
Priority date: 1990-08-30
Filing date: 1990-08-30
Publication date: 1992-04-23
Anticipated expiration: 2005-08-30
Also published as: JP2534224Y2

Description

【図面の簡単な説明】第１図は本考案の第１の実施例の回路図、第２
図は第１図の回路に使用された定電流回路の電圧
−電流特性図、第３図は本考案と従来例とを供給
電流について比較するための特性図、第４図は本
考案の第２の実施例の回路図、第５図は従来例の
回路図。図中、ＴＶは電源端子、ＴＯＵＴは出力端子、
ＴＧはアース端子。[Brief Description of the Drawings] Figure 1 is a circuit diagram of the first embodiment of the present invention;
The figure is a voltage-current characteristic diagram of the constant current circuit used in the circuit of Figure 1, Figure 3 is a characteristic diagram for comparing the supplied current between the present invention and the conventional example, and Figure 4 is the characteristic diagram of the constant current circuit of the present invention. 2 is a circuit diagram of the second embodiment, and FIG. 5 is a circuit diagram of a conventional example. In the figure, TV is the power supply terminal, TOUT is the output terminal,
TG is the ground terminal.

Claims

[Claims for Utility Model Registration] (1) A current supply section, and a series connection circuit of at least three resistors and transistors connected to the current supply section, and a resistor of one of the three resistors. A reference voltage circuit having a bandgap amplifier circuit configured to apply a voltage across the device to each input of a differential amplifier including two differential transistors.
Connect a base to a series circuit of two resistors and a connection point between these two resistors, connect an emitter and a collector between one end of the series circuit and a power line, and connect the other end of the series circuit to a ground line. a second transistor circuit having a collector and an emitter connected between the power supply line and the bandgap amplifier circuit, and a base connected to the output side of the differential amplifier; , a third transistor circuit having a base connected to one end of the series circuit, an emitter connected to the power supply line via a resistor, and a collector connected to the base of the second transistor. Reference voltage circuit. (2) A current supply unit and a series circuit of at least one resistor and one transistor for forming a current mirror circuit are connected to the current supply unit, and the voltage between the base and emitter of the one transistor is In the reference voltage circuit, the reference voltage circuit includes a bandgap amplifier circuit configured to apply a voltage difference between the base-emitter voltage of the other transistor to form the current mirror circuit as an input to the input transistor of the amplifier. The supply section has a configuration in which a series circuit of two resistors is connected, a base is connected to a connection point between these two resistors, an emitter and a collector are connected between one end of the series circuit and the power supply line, and the series circuit is connected to the base. a first transistor circuit whose other end is connected to a ground line;
a second transistor circuit whose collector and emitter are connected between the power supply line and the bandgap amplifier circuit, and whose base is connected to the output side of the amplifier; 1. A reference voltage circuit comprising: a power supply line connected to an emitter via a resistor; and a third transistor circuit having a collector connected to the base of the second transistor.