Datasheet > LM138_08

LM138_08

更新时间： 2024-01-26 21:21:09

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		稳压器
页数	文件大小	规格书
23页	1602K
描述
Three-terminal 5 A adjustable voltage regulators

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中文翻译

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LM138_08 数据手册

LM138 - LM238 - LM338

Three-terminal 5 A adjustable voltage regulators

Features

■ Guaranteed 7 A peak output current

■ Guaranteed 5 A output current

■ Adjustable output down to 1.2 V

■ Line regulation typically 0.005 %/V

■ Load regulation typically 0.1 %

■ Guaranteed thermal regulation

■ Current limit constant with temperature

■ Standard 3-lead transistor package

TO-3

protection remains functional even if the

adjustment pin is accidentally disconnected.

Normally, no capacitors are needed unless the

device is situated far 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 standard 3-terminal

regulators.

Description

The LM138, LM238, LM338 are adjustable 3-

terminal positive voltage regulators capable of

supplying in excess of 5 A over a 1.2 V to 32 V

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.

Besides replacing fixed regulators or discrete

designs, the LM238 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 input

differential is not exceeded.

A unique feature of the LM138 family is time-de-

pendent current limiting. The current limit circuitry

allows peak currents of up to 12 A to be drawn

from the regulator for short periods of time. This

allows the LM138 to be used with heavy transient

loads and speeds start-up under full-load

conditions. Under sustained loading conditions,

the current limit decreases to a safe value

protecting the regulator. Also included on the chip

are thermal overload protection and safe area

protection for the power transistor. Overload

The LM138, LM238, LM338 are packaged in

standard steel TO-3 transistor package. The

LM138 is rated for operation from - 55 °C to

150 °C, the LM238 from - 25 °C to 150 °C and the

LM338 from 0 °C to 125 °C.

Table 1.

Device summary

Part numbers

Order codes

Temperature range

LM138

LM238

LM338

LM138K

LM238K

LM338K

-55 °C to 150 °C

-25 °C to 150 °C

0 °C to 125 °C

April 2008

Rev 2

1/23

www.st.com

12 3 4 5 6 7...23

中文翻译

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与LM138_08相关器件

型号	品牌	获取价格	描述	数据表
LM138_16	TI	获取价格	5-Amp Adjustable Regulators
LM138-238-338	ETC	获取价格
LM138AK	ETC	获取价格	Voltage Regulator
LM138AK-883B	ETC	获取价格	Voltage Regulator
LM138AK-STEEL/883	TI	获取价格	IC,VOLT REGULATOR,ADJUSTABLE,+1.2 TO +32V,BIPOLAR,TO-204/-3,3PIN,METAL
LM138K	STMICROELECTRONICS	获取价格	THREE-TERMINAL 5 A ADJUSTABLE VOLTAGE REGULATORS
LM138K	NSC	获取价格	5-Amp Adjustable Regulators
LM138K	Linear	获取价格	5A Positive Adjustable Voltage Regulator
LM138K STEEL	TI	获取价格	采用气密封装的 5A 可调输出线性稳压器/LDO \| NDS \| 2 \| -55 to 1
LM138K STEEL/NOPB	TI	获取价格	采用气密封装的 5A 可调输出线性稳压器/LDO \| NDS \| 2 \| -55 to 1

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