Datasheet > LM340A

LM340A

更新时间： 2024-01-12 16:24:16

品牌	Logo	应用领域
美国国家半导体 - NSC		三端稳压器
页数	文件大小	规格书
15页	515K
描述
Series 3-Terminal Positive Regulators

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LM340A 数据手册

May 1999

LM140/LM340A/LM340/LM7800C

Series 3-Terminal Positive Regulators

General Description

Features

n Complete specifications at 1A load

The LM140/LM340A/LM340/LM7800C monolithic 3-terminal

positive voltage regulators employ internal current-limiting,

thermal shutdown and safe-area compensation, making

them essentially indestructible. If adequate heat sinking is

provided, they can deliver over 1.0A output current. They are

intended as fixed voltage regulators in a wide range of appli-

cations including local (on-card) regulation for elimination of

noise and distribution problems associated with single-point

regulation. In addition to use as fixed voltage regulators,

these devices can be used with external components to ob-

tain adjustable output voltages and currents.

n Output voltage tolerances of 2% at T_j25˚C and 4%

over the temperature range (LM140A/LM340A)

n Line regulation of 0.01% of V_OUT/V of ∆V_INat 1A load

(LM140A/LM340A)

n Load regulation of 0.3% of V_OUT/A (LM140A/LM340A)

n Internal thermal overload protection

n Internal short-circuit current limit

n Output transistor safe area protection

n P⁺Product Enhancement tested

Considerable effort was expended to make the entire series

of regulators easy to use and minimize the number of exter-

nal components. It is not necessary to bypass the output, al-

though this does improve transient response. Input bypass-

ing is needed only if the regulator is located far from the filter

capacitor of the power supply.

Output

Device

LM140

Packages

Voltages

5, 12,

TO-3 (K)

LM340A/LM340 5, 12,

TO-3 (K), TO-220 (T),

SOT-223 (MP), TO-263 (S)

(5V and 12V only)

The 5V, 12V, and 15V regulator options are available in the

steel TO-3 power package. The LM340A/LM340/LM7800C

series is available in the TO-220 plastic power package, and

the LM340-5.0 is available in the SOT-223 package, as well

as the LM340-5.0 and LM340-12 in the surface-mount

TO-263 package.

LM7800C

5, 8, 12, TO-220 (T)

Typical Applications

Fixed Output Regulator

Adjustable Output Regulator

DS007781-1

Required if the regulator is located far from the power supply filter.

Although no output capacitor is needed for stability, it does help transient

DS007781-2

response. (If needed, use 0.1 µF, ceramic disc).

5V + (5V/R1 + I ) R2 5V/R1 3 I ,

Q Q

OUT

load regulation (L ) ≈ [(R1 + R2)/R1] (L of LM340-5).

Current Regulator

Comparison between SOT-223 and D-Pak (TO-252)

Packages

DS007781-3

DS007781-38

∆I = 1.3 mA over line and load changes.

Scale 1:1

DS007781

www.national.com

12 3 4 5 6 7...15

中文翻译

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与LM340A相关器件

型号	品牌	获取价格	描述	数据表
LM340AK012	MOTOROLA	获取价格	Regulator, 1 Output, BIPolar,
LM340AK015	MOTOROLA	获取价格	Regulator, 1 Output, BIPolar
LM340AK-12	TI	获取价格	12V FIXED POSITIVE REGULATOR, MBFM2, POWER, METAL CAN, TO-3, 2 PIN
LM340AK15	MOTOROLA	获取价格	Regulator, 1 Output, BIPolar,
LM340AK-15	TI	获取价格	15V FIXED POSITIVE REGULATOR, MBFM2, POWER, METAL CAN, TO-3, 2 PIN
LM340AK5.0	MOTOROLA	获取价格	Regulator, 1 Output, BIPolar,
LM340AK-5.0	ETC	获取价格	Positive Fixed Voltage Regulator
LM340AK-6.0	ETC	获取价格	Positive Fixed Voltage Regulator
LM340AK8.0	TI	获取价格	IC,VOLT REGULATOR,FIXED,+8V,BIPOLAR,TO-204/-3,3PIN,METAL
LM340AK-8.0	ETC	获取价格	Positive Fixed Voltage Regulator

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