Datasheet > LM117E/88

LM117E/88

更新时间： 2024-10-30 22:22:43

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美国国家半导体 - NSC		稳压器
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描述
3-Terminal Adjustable Regulator

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LM117E/88 数据手册

July 2004

LM117/LM317A/LM317

3-Terminal Adjustable Regulator

age, supplies of several hundred volts can be regulated as

long as the maximum input to output differential is not ex-

ceeded, i.e., avoid short-circuiting the output.

General Description

The LM117 series of adjustable 3-terminal positive voltage

regulators is capable of supplying in excess of 1.5A over a

1.2V to 37V output range. They are exceptionally easy to

use and require only two external resistors to set the output

voltage. Further, both line and load regulation are better than

standard fixed regulators. Also, the LM117 is packaged in

standard transistor packages which are easily mounted and

handled.

Also, it makes an especially simple adjustable switching

regulator, a programmable output regulator, or by connecting

a fixed resistor between the adjustment pin and output, the

LM117 can be used as a precision current regulator. Sup-

plies with electronic shutdown can be achieved by clamping

the adjustment terminal to ground which programs the out-

put to 1.2V where most loads draw little current.

In addition to higher performance than fixed regulators, the

LM117 series offers full overload protection available only in

IC’s. Included on the chip are current limit, thermal overload

protection and safe area protection. All overload protection

circuitry remains fully functional even if the adjustment ter-

minal is disconnected.

For applications requiring greater output current, see LM150

series (3A) and LM138 series (5A) data sheets. For the

negative complement, see LM137 series data sheet.

Features

n Guaranteed 1% output voltage tolerance (LM317A)

n Guaranteed max. 0.01%/V line regulation (LM317A)

n Guaranteed max. 0.3% load regulation (LM117)

n Guaranteed 1.5A output current

n Adjustable output down to 1.2V

Normally, no capacitors are needed unless the device is

situated more than 6 inches from the input filter capacitors in

which case an input bypass is needed. An optional output

capacitor can be added to improve transient response. The

adjustment terminal can be bypassed to achieve very high

ripple rejection ratios which are difficult to achieve with stan-

dard 3-terminal regulators.

n Current limit constant with temperature

n P⁺Product Enhancement tested

n 80 dB ripple rejection

Besides replacing fixed regulators, the LM117 is useful in a

wide variety of other applications. Since the regulator is

“floating” and sees only the input-to-output differential volt-

n Output is short-circuit protected

LM117 Series Packages

Typical Applications

Part Number

Suffix

Design

Load

Current

1.5A

1.2V–25V Adjustable Regulator

Package

TO-3

TO-39

0.5A

1.5A

TO-220

LCC

0.5A

1.5A

TO-263

SOT-223

TO-252

EMP

MDT

0.5A

00906301

SOT-223 vs. D-Pak (TO-252)

Packages

Full output current not available at high input-output voltages

Needed if device is more than 6 inches from filter capacitors.

†

Optional — improves transient response. Output capacitors in the range

of 1µF to 1000µF of aluminum or tantalum electrolytic are commonly used

to provide improved output impedance and rejection of transients.

00906354

Scale 1:1

DS009063

www.national.com

12 3 4 5 6 7...25

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与LM117E/88相关器件

型号	品牌	获取价格	描述	数据表
LM117E/883	NSC	获取价格	3-Terminal Adjustable Regulator
LM117E/883	TI	获取价格	LM117QML 3-Terminal Adjustable Regulator
LM117EMP	ETC	获取价格	Positive Adjustable Voltage Regulator
LM117G	SEME-LAB	获取价格	POSITIVE ADJUSTABLE VOLTAGE REGULATOR
LM117G-8QR-B	ETC	获取价格	Voltage Regulator
LM117GW/883	TI	获取价格	军用级 1.5A 可调节输出线性稳压器/LDO \| NAC \| 16
LM117GWRLQMLV	TI	获取价格	LM117QML 3-Terminal Adjustable Regulator
LM117GWRQMLV	TI	获取价格	LM117QML 3-Terminal Adjustable Regulator
LM117H	SEME-LAB	获取价格	0.5 AMP POSITIVE ADJUSTABLE VOLTAGE REGULATOR
LM117H	TI	获取价格	LM117/LM317A/LM317-N 3-Terminal Adjustable Regulator

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