Datasheet > LR8

LR8

更新时间： 2024-11-16 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	693K
描述
High Input Voltage Adjustable 3-Terminal Linear Regulator

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LR8 数据手册

LR8

High Input Voltage

Adjustable 3-Terminal Linear Regulator

Features

General Description

The Supertex LR8 is a high voltage, low output current,

adjustable linear regulator. It has a wide operating input

voltage range of 13.2V to 450V. The output voltage can be

adjusted from 1.20V to 440V provided that the input voltage

is at least 12V greater than the output voltage. The output

voltage can be adjusted by means of two external resistors

R1 and R2 as shown in the typical application circuits. The

LR8 regulates the voltage difference between VOUT and ADJ

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

the external resistor ratio R1 and 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.

► 13.2V to 450V input voltage range

► Adjustable 1.20V to 440V output regulation

► 5% output voltage tolerance

► Output current limiting

► 10µA typical ADJ current

► Internal junction temperature limiting

Applications

► Off-line SMPS startup circuits

► Adjustable high voltage constant current source

► Industrial controls

The LR8 has current limiting and temperature limiting. The

output current limit is typically 20mA and the minimum

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

therefore be limited to 20mA. When the junction temperature

reaches its temperature limit, the output current and/or output

voltage will decrease to keep the junction temperature from

exceeding its temperature limit. For SMPS start-up circuit

applications, the LR8 turns off when an external voltage

greater than the output voltage of the LR8 is applied to VOUT

of the LR8. To maintain stability, a bypass capacitor of 1.0µF

or larger and a minimum DC output current of 500µA are

required.

► Motor controls

► Battery chargers

► Power supplies

The device is available in TO-243AA (SOT-89), TO-252 (D-

PAK), and TO-92 packages.

Typical Application Circuit

V_OUT

ADJ

LR8

R_LOAD

*Required for conditions where V_INis less than V_OUT

12 3 4 5 6 7...9

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