LM338K

更新时间： 2024-01-21 20:41:57

品牌	Logo	应用领域
美国国家半导体 - NSC		线性稳压器IC 调节器电源电路输出元件局域网
页数	文件大小	规格书
16页	399K
描述
5-Amp Adjustable Regulators

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技术参数
数据手册

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LM338K 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Active	零件包装代码：	TO-247
包装说明：	TO-247,	针数：	3
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.18
Is Samacsys：	N	最大差分输入-输出电压：	35 V
最小差分输入-输出电压：	3 V	JESD-30 代码：	R-PSFM-T3
功能数量：	1	端子数量：	3
工作温度TJ-Max：	70 °C	工作温度TJ-Min：
最大输出电流 1：	5 A	最大输出电压 1：	35 V
最小输出电压 1：	1.25 V	封装主体材料：	PLASTIC/EPOXY
封装代码：	TO-247	封装形状：	RECTANGULAR
封装形式：	FLANGE MOUNT	峰值回流温度（摄氏度）：	NOT SPECIFIED
认证状态：	Not Qualified	调节器类型：	ADJUSTABLE POSITIVE SINGLE OUTPUT STANDARD REGULATOR
表面贴装：	NO	端子形式：	THROUGH-HOLE
端子位置：	SINGLE	处于峰值回流温度下的最长时间：	NOT SPECIFIED
Base Number Matches：	1

LM338K 数据手册

May 1998

LM138/LM338

5-Amp Adjustable Regulators

Besides replacing fixed regulators or discrete designs, the

LM138 is useful in a wide variety of other applications. Since

the regulator is “floating” and sees only the input-to-output

differential voltage, supplies of several hundred volts can be

regulated as long as the maximum input to output differential

is not exceeded, i.e., do not short-circuit output to ground.

The part numbers in the LM138 series which have a K suffix

are packaged in a standard Steel TO-3 package, while those

with a T suffix are packaged in a TO-220 plastic package.

The LM138 is rated for −55˚C ≤ T_J≤ +150˚C, and the LM338

is rated for 0˚C ≤ T_J≤ +125˚C.

General Description

The LM138 series of adjustable 3-terminal positive voltage

regulators is capable of supplying in excess of 5A over a

1.2V to 32V output range. They are exceptionally easy to

use and require only 2 resistors to set the output voltage.

Careful circuit design has resulted in outstanding load and

line regulation — comparable to many commercial power

supplies. The LM138 family is supplied in a standard 3-lead

transistor package.

A unique feature of the LM138 family is time-dependent cur-

rent limiting. The current limit circuitry allows peak currents

of up to 12A to be drawn from the regulator for short periods

of time. This allows the LM138 to be used with heavy tran-

sient loads and speeds start-up under full-load conditions.

Under sustained loading conditions, the current limit de-

creases to a safe value protecting the regulator. Also in-

cluded on the chip are thermal overload protection and safe

area protection for the power transistor. Overload protection

remains functional even if the adjustment pin is accidentally

disconnected.

Features

n Guaranteed 7A peak output current

n Guaranteed 5A output current

n Adjustable output down to 1.2V

n Guaranteed thermal regulation

n Current limit constant with temperature

n P⁺Product Enhancement tested

n Output is short-circuit protected

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

ated more than 6 inches from the input filter capacitors in

which case an input bypass is needed. An output capacitor

can be added to improve transient response, while bypass-

ing the adjustment pin will increase the regulator’s ripple re-

jection.

Applications

n Adjustable power supplies

n Constant current regulators

n Battery chargers

Connection Diagrams (See Physical Dimension section for further information)

(TO-3 STEEL)

Metal Can Package

(TO-220)

Plastic Package

DS009060-31

Front View

Order Number LM338T

See NS Package Number T03B

DS009060-30

Bottom View

Order Number LM138K STEEL or LM338K STEEL

See NS Package Number K02A

DS009060

www.national.com

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中文翻译

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与LM338K相关器件

型号	品牌	获取价格	描述	数据表
LM-338K	Linear	获取价格	5A Positive Adjustable Voltage Regulator
LM338KSTEEL	TI	获取价格	LM138/LM338 5-Amp Adjustable Regulators
LM338KSTEEL	NSC	获取价格	IC-ADJ. REGULATOR
LM338K-STEEL	ETC	获取价格	Positive Adjustable Voltage Regulator
LM338KSTEEL/NOPB	TI	获取价格	LM138/LM338 5-Amp Adjustable Regulators
LM338-MIL	TI	获取价格	5-Amp Adjustable Regulators
LM338MK	Linear	获取价格	IC VREG 1.2 V-32 V ADJUSTABLE POSITIVE REGULATOR, MBFM4, METAL, TO-3, 8 PIN, Adjustable Po
LM338MWC	NSC	获取价格	IC VREG 1.2 V-32 V ADJUSTABLE POSITIVE REGULATOR, UUC, WAFER, Adjustable Positive Single O
LM338MWC	TI	获取价格	5-Amp Adjustable Regulators
LM338N-1	TI	获取价格	2.2W, 1 CHANNEL, AUDIO AMPLIFIER, PDIP14

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