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UNISONIC TECHNOLOGIES CO., LTD L3012 Preliminary LINEAR INTEGRATED CIRCUIT w w w . u n i s o n i c . c o m . t w 1 of 5 Copyright © 2013 Unisonic Technologies Co., Ltd QW-R125-025. b 1A HIGH POWER LED DRIVER WITH 4.5~40V INPUT  DESCRIPTION The UTC L3012 is a step-down PWM control LED driver with a built-in power Switch. It achieves 1A continuous output current in 4.5~40V input voltage range. It has high efficiency up to more than 96%, with the excellent current accuracy within ±1%.  FEATURES * 4.5~40V input voltage range * Maximum 1A output current * 0.15Ω built-in power MOSFET * 280kHz fixed frequency * Excellent constant current accuracy ±1% * Thermal shutdown * Cycle-by-cycle over current protection * PWM dimming function SOP-8  ORDERING INFORMATION Ordering Number Package Packing Lead Free Halogen Free L3012L-S08-T L3012G-S08-T SOP-8 Tube L3012L-S08-R L3012G-S08-R SOP-8 Tape Reel

L3012 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 of 5 www.unisonic.com.tw Q W - R 1 2 5 - 0 2 5 . b  PIN CONFIGURATION SW GND SENSE VIN ADJ V DD PWM COMP  PIN DESCRIPTION PIN NO. PIN NAME DESCRIPTION 1 SW Power Switch output. 2 GND Ground. 3 SENSE Current sense pin. 4 V IN Input supply voltage. 5 COMP Compensation pin, connec ts to external capacitor. 6 PWM PWM dimming pin.

7 V DD 5V LDO output

8 ADJ Thermal compensation pin or linear dimming pin.  BLOCK DIAGRAM VIN SENSE COMP VDD 8ADJ 6PWM GND 1 SW S Q Current comparator Osc Current setting Internal reference Driver Vgate PWM Control OSC Vsense Slope compensation

L3012 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 of 5 www.unisonic.com.tw Q W - R 1 2 5 - 0 2 5 . b  ABSOLUTE MAXIMUM RATING (unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Supply Voltage V IN 40 V Switch Voltage V SW -1~V IN+1 V Comp Voltage V COMP -0.3~6 V SENSE Voltage V SENSE -0.3~V IN V Input Voltage V IN 4.5~40 V Junction Temperature T J 150 °C Operating Temperature T OPR -40 ~ +125 °C Storage Temperature T STG -65 ~ +150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied.  ELECTRICAL CHARACTERISTICS (TA=25°C, unless otherwise specified, VIN=12V, IOUT=700mA) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Supply Voltage V IN 6 36 V Operating Current I IN V CC=4/40V (Switch Off) 2.2 4 mA Upper Switch Leakage I L V SW=40V 0 5 μA Current Limit I LIM V IN=SENSE=12V 1.7 2 3 A Maximum Duty Cycle D MAX 3LED, V IN=9V 94 96 % Oscillator Frequency f OSC 250 280 320 kHz COMP Clamp Voltage V COMP Open without load 1.6 2 2.2 V Switch Transistor on Resistance R ON 1LED, I OUT=1A 0.15 0.5 Ω Sampling Voltage Threshold V IN-VSENSE Drop voltage between V IN and SENSE 100 mV Thermal Shutdown Threshold TSD 160 °C Thermal Shutdown Hysteresis TSD-hys 30 °C

L3012 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 4 of 5 www.unisonic.com.tw Q W - R 1 2 5 - 0 2 5 . b  FUNCTION DESCRIPTION The UTC L3012 is a current mode and fixed frequency (280kHz) LED driver. 1. Output current setting The output current is determined by the sampling resistor (R S) and setting voltage (V IN-VSENSE a built-in fixed 100mV). S SENSEIN OUT R VVI  =100mV/Rs 2. Current limiting UTC L3012 has internal current limiting function, and the voltage on COMP is clamped at about 2V, the output current of the power MOSFET is limited at about 2A by current comparator. 3. Diode Selection UTC L3012 driver LED need a Schottky diode. If output current is 700mA or smaller then SS14 (D1N5819) is ok. The average current through the diode is ID: ID= (1-D)·ILED ILED is the current of LED  TYPICAL APPLICATION CIRCUIT SW GND SENSE VIN ADJ VDD PWM COMP SBD VIN Rs Cout L 10µF 1µF100nF

L3012 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 5 of 5 www.unisonic.com.tw Q W - R 1 2 5 - 0 2 5 . b UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.