USL1650

UNISONIC TECHNOLOGIES CO., LTD USL1650 Preliminary LINEAR INTEGRATED CIRCUIT HIGH EFFICIENCY PWM BUCK LED DRIVER CONTROLLER  DESCRIPTION The UTC USL1650 is a PWM mode step-down converter (with a high voltage power MOSFET with SOP8 package). By well regulating a constant output current. The output duty cycle of the UTC USL1650 can be up to 100% for wider input voltage application. The UTC USL1650 is available in a SOP-8 package.  FEATURES * Universal input voltage range with off-line topology * Programmable constant LED current * Output LED string short protection * Output LED string open protection * Dimmable LED current by ACTL * OCP * Built-in OTP  ORDERING INFORMATION Ordering Number USL1650G-S08-R Package SOP-8 Packing Tape Reel USL1650G-S08-R (1)Packing Type. (2)Package Type (3)Green Package (1) R: Tape Reel (2) S08: SOP-8 (3) G: Halogen Free and Lead Free  MARKING www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 4 QW-R125-029.c USL1650  PIN CONFIGURATIONS Preliminary LINEAR INTEGRATED CIRCUIT  PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 7, 8 PIN NAME VCC VIN ACTL VC SENSE GND NC Power supply. Power MOS drain. Analog dimming control. Compensation pin. LED current sense input pin. Ground of the chip.  BLOCK DIAGRAM VCC 1 DESCRIPTION 17V/7.5V 35V + VCCOVP - + UVLO - Internal Bias & Vref VCC OK All Blocks EN SENSE 5 VC 4 + CC - Current VREF Waveform modulation ACTL 3 Dimming Function +- + - OSC 6 GND RQ R S Dri...