UNISONIC TECHNOLOGIES CO., LTD L3010 LINEAR INTEGRATED CIRCUIT 1A HIGH POWER LED DRIVER WITH 4.5~40V INPUT DESCRIPTION The UTC L3010 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%. SOP-8 FEATURES * 4.5~40V input voltage range * Maximum 1A output current * 0.25Ω built-in power MOSFET * 280kHz fixed frequency * Excellent constant current accuracy ±1% * High efficiency up to 96% * Thermal shutdown * Cycle-by-cycle over current protection ORDERING INFORMATION Ordering Number L3010G-S08-R L3010G-S08-R Package SOP-8 (1)Packing Type (1) R: Tape Reel (2)Package Type (2) S08: SOP-8 (3)Green Package (3) G: Halogen Free and Lead Free Packing Tape Reel MARKING www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 6 QW-R125-024.C L3010 PIN CONFIGURATION SW 1 8 NC GND 2 7 NC SENSE 3 6 NC 5 COMP VIN 4 PIN DESCRIPTION PIN NO. 1 2 3 4 5 6~8 DESCRIPTION Power Switch output. Ground. Current sense pin. Input supply voltage. Compensation pin, connects to external capacitor. No Connected. BLOCK DIAGRAM VIN 4 OTP 88mV UVLO Reference 1 SW SS + SNESE 3 - NMOS + EA COMP 5 - S PWM R Q Driver 280KHz Slope COMP + + Rsense - PIN NAME SW GND SENSE VIN COMP NC + LINEAR INTEGRATED CIRCUIT Current Sense UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 GND 2 of 6 QW-R125-024.C L3010 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (TA = 25°C, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Supply Voltage VIN 43 V Switch Voltage VSW -1~VIN+1 V Comp Voltage VCOMP -0.3~6 V SENSE Voltage VSENSE -0.3~VIN V Input Voltage VIN 4.5~40 V Junction Temperature TJ 150 °C Operating Temperature TOPR -40 ~ +125 °C Storage Temperature TSTG -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 (VIN=12V, IOUT=700Ma, TA=25°C, unless otherwise specified) PARAMETER Supply Voltage Operating Current Upper Switch Leakage Current Limit Maximum Duty Cycle Oscillator Frequency COMP Clamp Voltage Switch Transistor on Resistance Sampling Voltage Threshold Thermal Shutdown Threshold Thermal Shutdown Hysteresis SYMBOL VIN IIN IL ILIM DMAX fOSC VCOMP RON VIN-VSENSE TSD TSD-hys TEST CONDITIONS VCC=4/40V (Switch Off) VSW=40V VIN=SENSE=12V 3LED, VIN=9V Open without load 1LED, IOUT=1A Drop voltage between VIN and SENSE UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 4.5 1.7 250 1.6 TYP 2.2 0 2.1 97 280 2 0.25 88 160 30 MAX 40 4 5 3 360 2.2 0.5 UNIT V mA μA A % kHz V Ω mV °C °C 3 of 6 QW-R125-024.C L3010 LINEAR INTEGRATED CIRCUIT FUNCTION DESCRIPTION The UTC L3010 is a current mode and fixed frequency (280kHz) LED driver. 1. Output current setting The output current is determined by the sampling resistor (RS) and setting voltage (VIN-VSENSE a built-in fixed 88mV). V VSENSE I OUT IN =88mV/Rs RS 2. Current limiting UTC L3010 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 2.1A by current comparator. COMPONENTS SELECTION 1. Input Capacitor Selection This capacitor should be located close to the IC using short leads. The RMS current rating requirement for the input capacitor of a buck regulator is approximately 1⁄2 the DC load current. A low ESR input capacitor sized for maximum RMS current must be used. It is recommend use the MLCC capacitor of 10μF or larger. 2. Output Capacitance Selection The output capacitor is required to filter the output reduce the ripple current of LED and provide regulator loop stability. The important capacitor parameters are; The 100KHz Equivalent Series Resistance (ESR), the RMS ripples current rating, voltage rating, and capacitance value. For the output capacitor, the ESR value is the most important parameter. It is recommend use the MLCC capacitor of 2.2μF or larger. 3. Inductance Selection For most designs, the operates with inductors of 47μH to 68μH. Where is inductor Ripple Current. Large value inductors lower ripple current and small value inductors result in high ripple currents. The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple current to prevent core saturation. In order to improve the efficiency, the series-wound resistor (DCR) of inductance should be smaller than 0.2Ω. The inductor value can be derived from the following equation: V ( VIN VOUT ) L OUT VIN IL f OSC Where: L: Inductance value F: Oscillator frequency ∆I is ripple current 4. Diode Selection UTC L3010 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 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 6 QW-R125-024.C L3010 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT VIN Rs 0.25 4 VIN + CIN + 10µF 2.2µF SENSE 3 UTC L3010 47µH SW 1 5 COMP GND 100nF 2 4.5~40V input voltage, 350mA output LED driver Note: The circuit and parameters are reference only, please set the parameters of the real application circuit based on the real test . UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R125-024.C L3010 LINEAR INTEGRATED CIRCUIT Efficiency (%) Efficiency (%) TYPICAL CHARACTERISTICS 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. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 6 QW-R125-024.C