NON ISOLATED BUCK CONSTANT CURRENT HIGH PF LED DRIVER IC

DESCRIPTION

UL83B are a highly integrated power switch with constant current

(CC) control for LED lighting applications. which is suitable for the non

isolated buck LED constant current power supply with 85Vac~265Vac

full range input voltage, active PFC control for high PF, low THD, and

high efficiency.

UL83B integrates 550V power MOSFET with high voltage startup

and IC power supply circuit, which requires very few external

components. The IC senses the inductor current during the whole

switching cycle, which can achieve high precision CC control with

excellent line and load regulation.

UL83B 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.

UL83B has a variety of protection features, including LED short

circuit protection, under voltage protection, over temperature

adjustment function and so on.

FEATURES

* Active PFC for High PF and Low THD

* PF>0.9 with Universal Input

*The integrated 550V 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