LM317SP+

更新时间： 2024-10-29 03:09:43

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
26页	999K
描述
3-Terminal Adjustable Regulator

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LM317SP+ 数据手册

April 2007

LM117/LM317A/LM317

3-Terminal Adjustable Regulator

the maximum input to output differential is not exceeded, 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 volt-

age. 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 reg-

ulator, 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. Supplies

with electronic shutdown can be achieved by clamping the

adjustment terminal to ground which programs the output to

1.2V where most loads draw little current.

For applications requiring greater output current, see LM150

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

ative complement, see LM137 series data sheet.

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 termi-

nal is disconnected.

Features

Guaranteed 1% output voltage tolerance (LM317A)

■

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

Normally, no capacitors are needed unless the device is sit-

uated more than 6 inches from the input filter capacitors in

which case an input bypass is needed. An optional output ca-

pacitor 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.

Guaranteed max. 0.3% load regulation (LM117)

Guaranteed 1.5A output current

Adjustable output down to 1.2V

Current limit constant with temperature

P⁺Product Enhancement tested

Besides replacing fixed regulators, the LM117 is useful in a

wide variety of other applications. Since the regulator is “float-

ing” and sees only the input-to-output differential voltage,

supplies of several hundred volts can be regulated as long as

80 dB ripple rejection

Output is short-circuit protected

■

LM117/LM317A/LM317 Package Options

Typical Applications

Part

Output

Suffix Package

Number

Current

1.2V–25V Adjustable Regulator

LM117, LM317

LM317

TO-3

TO-220

TO-263

SOT-223

TO-39

1.5A

1.0A

0.5A

LM317

LM317A, LM317

LM117, LM317A, LM317

LM117

EMP

LCC

LM317A, LM317

MDT

TO-252

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

Packages

906301

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.

906354

Scale 1:1

9063

www.national.com

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与LM317SP+相关器件

型号	品牌	获取价格	描述	数据表
LM317SX	NSC	获取价格	3-Terminal Adjustable Regulator
LM317SX	TI	获取价格	1.2 V-37V ADJUSTABLE POSITIVE REGULATOR, PSSO3, TO-263, 3 PIN
LM317SX/NOPB	TI	获取价格	LM117/LM317A/LM317-N 3-Terminal Adjustable Regulator
LM317T	TI	获取价格	LM117/LM317A/LM317-N 3-Terminal Adjustable Regulator
LM317T	COMSET	获取价格	3-Terminal Positive Adjustable Regulators
LM317T	MCC	获取价格	Adjustable Voltage Regulators
LM317T	TGS	获取价格	3-Terminal Positive Adjustable Regulator
LM317T	ISC	获取价格	Adjustable Voltage Regulator
LM317T	FAIRCHILD	获取价格	Adjustable Voltage Regulator (Positive)
LM317T	STMICROELECTRONICS	获取价格	1.2V TO 37V VOLTAGE REGULATOR

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