LM79LXXAC

更新时间： 2024-11-29 03:15:07

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器
页数	文件大小	规格书
8页	209K
描述
3-Terminal Negative Regulators

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数据手册

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LM79LXXAC 数据手册

January 2003

LM320L/LM79LXXAC/LM13121 Series

3-Terminal Negative Regulators

the 3-lead TO-92 package, 8-lead SOIC package, and the

6-Bump micro SMD package. The LM320L series is avail-

able in the 3-lead TO-92 package.

General Description

The LM320L/LM79LXXAC/LM13121 dual marked series of

3-terminal negative voltage regulators features fixed output

voltages of −5V, −12V, and −15V with output current capa-

bilities in excess of 100mA. These devices were designed

using the latest computer techniques for optimizing the pack-

aged IC thermal/electrical performance. The LM79LXXAC

series, even when combined with a minimum output com-

pensation capacitor of 0.1µF, exhibits an excellent transient

response, a maximum line regulation of 0.07% V_O/V, and a

maximum load regulation of 0.01% V_O/mA.

For output voltage other than −5V, −12V and −15V, the

LM137L series provides an output voltage range from 1.2V

to 47V.

Features

n Preset output voltage error is less than 5% overload,

line and temperature

n Specified at an output current of 100mA

n Easily compensated with a small 0.1µF output

capacitor

n Internal short-circuit, thermal and safe operating area

protection

n Easily adjustable to higher output voltages

n Maximum line regulation less than 0.07% V_OUT/V

n Maximum load regulation less than 0.01% V_OUT/mA

n See AN-1112 for micro SMD considerations

The LM320L/LM79LXXAC/LM13121 series also includes, as

self-protection circuitry: safe operating area circuitry for out-

put transistor power dissipation limiting, a temperature inde-

pendent short circuit current limit for peak output current

limiting, and a thermal shutdown circuit to prevent excessive

junction temperature. Although designed primarily as fixed

voltage regulators, these devices may be combined with

simple external circuitry for boosted and/or adjustable volt-

ages and currents. The LM79LXXAC series is available in

Typical Applications

Adjustable Output Regulator

Fixed Output Regulator

00774801

*Required if the regulator is located far from the power supply filter. A 1µF

aluminum electrolytic may be substituted.

00774803

−V = −5V − (5V/R1 + I ) • R2,

5V/R1 3 I

* Required for stability. A 1µF aluminum electrolytic may be substituted.

Connection Diagrams

6-Bump micro SMD

TO-92 Plastic Package (Z)

00774802

Bottom View

00774820

Bump Side Down

DS007748

www.national.com

12 3 4 5 6 7 8

中文翻译

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