Datasheet > LR12

LR12

更新时间： 2024-11-06 05:42:47

品牌	Logo	应用领域
超科 - SUPERTEX		稳压器
页数	文件大小	规格书
9页	827K
描述
High Input Voltage Adjustable 3-Terminal Linear Regulator

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LR12 数据手册

LR12

High Input Voltage

Adjustable 3-Terminal Linear Regulator

Features

General Description

❏

13.2V to 100V Input Voltage Range

TheSupertexLR12isahighvoltage,lowoutputcurrent,adjustable

linear regulator. It has a wide operating input voltage range of

13.2V to 100V. The output voltage can be adjusted from 1.20V to

88Vprovidedthattheinputvoltageisatleast12Vgreaterthanthe

output voltage. The output voltage can be adjusted by means of

twoexternalresistorsR₁andR₂asshowninthetypicalapplication

circuits.The LR12 regulates the voltage difference between V_OUT

andADJ pins to a nominal value of 1.20V. The 1.20V is amplified

by the external resistor ratio R₁and R₂. An internal constant bias

current of typically 10µA is connected to the ADJ pin. This

increases V_OUTby a constant voltage of 10µA times R₂.

Stable with 100nF output capacitor

Adjustable 1.20V to 88V output regulation

5% reference voltage tolerance

Output current limiting, 50mA min.

10µA typical ADJ current

Over temperature protection

Available in 3 different packages

The LR12 has current limiting and temperature limiting. The

output current limit is 100mA maximum and the minimum

temperature limit is 125°C. An output short circuit current will

therefore be limited to 100mA maximum. When the junction

temperaturereachesitstemperaturelimit,theoutputcurrentand/

or output voltage will decrease to keep the junction temperature

from exceeding its temperature limit. For SMPS start-up circuit

applications, the LR12 turns off when an external voltage greater

than the output voltage of the LR12 is applied to V_OUTof the LR12.

To maintain stability, a bypass capacitor of 100nF or larger and a

minimum DC output current of 500µA are required.

Applications

❏

DC/DC SMPS startup circuits

Adjustable high voltage constant current sources

❏

Industrial Controls

Motor Controls

Battery Powered Systems

Power Supplies

The device is available in TO-92, SO-8, and TO-252 (D-PAK)

packages.

Telecom Applications

LED Drivers

Automotive Applications

LR12 Typical Application

V_OUT

1.2V to 88V

V_IN

V_OUT

V_IN

ADJ

13.2V to

100V

LR12

R_LOAD

*Required for conditions where V_INis less than V_OUT

A081605

12 3 4 5 6 7...9

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