ULW2091L-T92-B Datasheet, PDF (1/12 Pages) Unisonic Technologies – LINEAR INTEGRATED CIRCUIT

UNISONIC TECHNOLOGIES CO., LTD
ULW2091
Preliminary
NON ISOLATED BUCK
CONSTANT CURRENT LED
DRIVER IC
 DESCRIPTION
ULW2091 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.
ULW2091 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.
ULW2091 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.
ULW2091 has a variety of protection features, including LED
short circuit protection, under voltage protection, over temperature
adjustment function and so on.
LINEAR INTEGRATED CIRCUIT
3
1
2
SOT-23-3
(JEDEC TO-236)
3
1
2
SOT-23
(JEDEC SC-59)
1
SOT-89
HSOP-8
1
TO-92
 FEATURES
* 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
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