Datasheet > LM140

LM140

更新时间： 2024-11-02 12:55:51

品牌	Logo	应用领域
德州仪器 - TI		三端稳压器
页数	文件大小	规格书
28页	3085K
描述
LM340-N/LM78XX Series 3-Terminal Positive Regulators

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LM140 数据手册

LM340-N, LM78xx

www.ti.com

SNOSBT0J –FEBRUARY 2000–REVISED DECEMBER 2013

LM340-N/LM78XX Series 3-Terminal Positive Regulators

Check for Samples: LM340-N, LM78xx

FEATURES

DESCRIPTION

The LM140/LM340A/LM340-N/LM78XXC 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 applications

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 obtain adjustable output

voltages and currents.

•

Complete Specifications at 1A Load

Output Voltage Tolerances of ±2% at T_j= 25°C

and ±4% Over the Temperature Range

(LM340A)

•

Line Regulation of 0.01% of V_OUT/V of ΔV_INat

1A Load (LM340A)

•

Load Regulation of 0.3% of V_OUT/A (LM340A)

Internal Thermal Overload Protection

Internal Short-circuit Current Limit

Output Transistor Safe Area Protection

P⁺Product Enhancement Tested

Considerable effort was expended to make the entire

series of regulators easy to use and minimize the

number of external components. It is not necessary to

bypass the output, although this does improve

transient response. Input bypassing is needed only if

the regulator is located far from the filter capacitor of

the power supply.

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

in the steel TO-3 power package. The

LM340A/LM340-N/LM78XXC series is available in the

TO-220 plastic power package, and the LM340-N-5.0

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

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

DDPAK/TO-263 package.

Typical Applications

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

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

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

V_OUT= 5V + (5V/R1 + I_Q) R2 5V/R1 > 3 I_Q,

load regulation (L_r) ≈ [(R1 + R2)/R1] (L_rof LM340-5).

Figure 1. Fixed Output Regulator

Figure 2. Adjustable Output Regulator

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

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