2015. 9. 28

1/3

SEMICONDUCTOR

TECHNICAL DATA

FRR8

Revision No : 0

High Input Voltage Adjustable 3-Terminal Linear Regulator

Features

■ 12V 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

■ Motor controls

■ Battery chargers

■ Power supplies

General Description

The FRR8 is a high voltage, low output current, adjustable

linear regulator. It has a wide operating input voltage range

of 12V to 450V. The output voltage can be adjusted from

1.20V to 440V provided that the input voltage is at least

10V 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 AnR8

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 10uA is cnnnected to

times R2.

The AnR8 has current limiting and temperature limiting.

The output current limit is typically 15mA and the minimum

temperature limit is 125℃. An output short circuit current

will therefore be limited to 15mA. 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 AnR8 turns off

when an external voltage greater than the output voltage of

DC output current of 500uA are required.

The device is available in SOT-89 and TO-252 packages.

FRR8 Block Diagram and Typical Application

FRR8

stability, a bypass capacitor of 1.0uF or larger and a minimum