UNISONIC TECHNOLOGIES CO., LTD

UL82B

Preliminary

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

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Copyright © 2016 Unisonic Technologies Co., Ltd

QW-R125-056.a

NON ISOLATED BUCK

CONSTANT CURRENT LED

DRIVER IC



DESCRIPTION

UL82B

is a high precision LED BUCK constant current driver

chip. The chip operates in the inductor current critical continuous

mode, which is suitable for the non isolated buck LED constant

current power supply with 85Vac~265Vac full range input voltage.

UL82B

chip integrated 500V power switch by patent

demagnetization detection technology and high voltage power

supply technology, without detection and power supply for auxiliary

winding, the peripheral devices are more simple, saving the cost

and volume of the system.

UL82B

chip with high precision current sampling circuit, while

the use of patented constant current control technology to achieve

high accuracy of the LED constant current output and excellent line

voltage regulator. The chip operates in the critical mode of inductor

current and the output current is not changed with the increase of

the inductance and the working voltage of LED.

UL82B

has a variety of protection features, including LED short

circuit protection, under voltage protection, over temperature

adjustment function and so on.



FEATURES

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TO-92

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SOT-23-3

(JEDEC TO-236)

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3

SOT-89

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SOT-23

(JEDEC SC-59)

HSOP-8

* The integrated 500V power mos.

* The integrated high voltage power supply function.

* The inductor current critical continuous mode.

* Without auxiliary winding detection and power supply.

* The wide voltage input voltage.

* ±5% LED output current accuracy.

* The LED short circuit and open circuit protection.

* The chip power supply under voltage protection.

* The regulating function of overheating