Datasheet > LR8

LR8

更新时间： 2024-11-21 14:56:03

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
18页	804K
描述
LR8 is a high voltage, low output current, adjustable linear regulator. It has a wide operating in

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LR8 数据手册

LR8

High-Input Voltage, Adjustable, 3-Terminal,

Linear Regulator

Features

General Description

• 13.2-450V Input Voltage Range

• Adjustable 1.20-438V Output Regulation

• 5% Output Voltage Tolerance

• Output Current Limiting

LR8 is a high-voltage, low-output current, adjustable

linear regulator. This regulator has a wide operating

input voltage range of 13.2-450V. The output voltage

can be adjusted from 1.20-438V, 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, R₁and R₂, as shown in the typical

application circuits. LR8 regulates the voltage differ-

ence between V_OUTand ADJ 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 10 µA, is connected to the ADJ pin. This

increases V_OUTby a constant voltage of 10 µA times

R₂.

• 10 µA Typical ADJ Current

• Internal Junction Temperature Limiting

Applications

• Offline SMPS startup circuits

• Adjustable high-voltage constant current source

• Industrial controls

• Motor controls

• Battery chargers

LR8 provides both current and temperature limiting.

The output current limit is typically 20 mA and the

minimum temperature limit is +125°C. An output short-

circuit current will therefore be limited to 20 mA. When

the junction temperature reaches its temperature limit,

the output current and/or output voltage will decrease

to prevent the junction temperature from exceeding its

temperature limit. For SMPS start-up circuit applica-

tions, LR8 turns off when an external voltage greater

than the output voltage of the LR8 is applied to V_OUTof

the LR8. To maintain stability, a bypass capacitor of

1.0 µF or larger and a minimum DC output current of

500 µA are required.

• Power supplies

LR8 is available in TO-243AA (SOT-89), TO-252 (D-

PAK) and TO-92 packages.

 2015-2017 Microchip Technology Inc.

DS20005399B-page 1

12 3 4 5 6 7...18

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