JPS6034778U

JPS6034778U - switching regulator

Info

Publication number: JPS6034778U
Application number: JP12539083U
Authority: JP
Inventors: 水村　忠男
Original assignee: 日本電気株式会社
Priority date: 1983-08-12
Filing date: 1983-08-12
Publication date: 1985-03-09

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

[Brief explanation of the drawing]

第１図は従来のスイッチングレギュレータの一例を示す
回路図、第２図は制御用ＩＣの電圧と出力パルスのデユ
ーティ比の関係を示すグラフ、第３図は本考案の実施例
の回路図、第４図は第３図のスイッチ回路の回路図であ
る。図において、１・・・・・・スイッチングレギュレ
ータ制御用ＩＣ，２・・・・・・電圧出力端子、１０・
・・・・・スイッチ制御回路、Ａ１・・・・・・演算増
幅器、Ｃ１・・・・・・平滑用コンデンサ、Ｄｌ、Ｄ２
・・・・・・整流用ダイオード、Ｄｌｏ・・・・・・定
電圧ダイオード、Ｄ工、・・・・・・ダイオード、Ｌｌ
・・・・・・平滑用コイル、Ｑｌ、Ｑ２・・・・・・出
力トランジスタ、Ｑｌｏ・・・・・・スイッチングトラ
ンジスタ、Ｒ１，Ｒ２・・・・・・分圧用抵抗、Ｒ３・
・・・・・電流検出抵抗、Ｒ４，’Ｒ５・・・・・・ベ
ース用抵抗、ＲＩＯ・・・・・・分圧用抵抗、Ｒ□□〜
Ｒ１７・・・・・・抵抗、Ｔ□・・・・・・トランス、
である。Fig. 1 is a circuit diagram showing an example of a conventional switching regulator, Fig. 2 is a graph showing the relationship between the voltage of the control IC and the duty ratio of the output pulse, and Fig. 3 is a circuit diagram of an embodiment of the present invention. FIG. 4 is a circuit diagram of the switch circuit of FIG. 3. In the figure, 1... switching regulator control IC, 2... voltage output terminal, 10...
... Switch control circuit, A1 ... Operational amplifier, C1 ... Smoothing capacitor, Dl, D2
... Rectifier diode, Dlo ... Constant voltage diode, D engineering, ... Diode, Ll
... Smoothing coil, Ql, Q2 ... Output transistor, Qlo ... Switching transistor, R1, R2 ... Voltage dividing resistor, R3.
...Current detection resistor, R4,'R5...Base resistance, RIO...Voltage division resistor, R□□～
R17...Resistor, T□...Transformer,
It is.

Claims

[Scope of utility model registration request]

A switching regulator that stably controls an input voltage using a pulse width control type switching regulator control IC that has an adjustment input terminal that can adjust the output pause period of an output pulse and a constant voltage terminal that outputs a reference voltage,
a voltage divider circuit that divides the reference voltage into a predetermined voltage division ratio and supplies the voltage to the adjustment input terminal; a switch element connected to the voltage divider circuit to switch the voltage division ratio; Compare and turn on/off the switch element.
A switching regulator including a switch drive circuit for off-drive.