unisonic technologies co., ltd L4120 preliminary cmos ic www.unisonic.com.tw 1 of 4 copyright ? 2014 unisonic technologies co., ltd qw-r125-031.a 40v/1.2a integrated power led driver ? description the utc L4120 is a continuous conduction mode inductive step-down converter, designed for driving single or multiple series connected leds. using a few external components. the utc l3080 has a build-in power switch, based on different input voltage, the utc L4120 can drive several 1w or 3w leds. the device has the function of t hermal shutdown protection and led short-circuit/open-circuit protection. ? features * up to 1.2a output current * high efficiency (up to 97%) * wide input voltage range: 5v~30v * typical 5% output current accuracy * single dim pin on/off and brightne ss control using dc voltage or pwm signal * internal thermal shutdown protection. * adjustable constant led current 1 sot-89-5 ? ordering information ordering number package packing lead free halogen free L4120l-ab5-r L4120g-ab5-r sot-89-5 tape reel (1) r: tape reel (2) ab5: sot-89-5 (3) l: lead free, g: halogen free L4120l-ab5-r (1)packing type (2)package type (3)lead free ? marking
L4120 preliminary cmos ic unisonic technologies co., ltd 2 of 4 www.unisonic.com.tw qw-r125-031.a ? pin configuration ? pin description pin no. pin name description 1 lx switch pin 2 gnd ground 3 adj multi-function on/off and brightness control pin 4 i sense current sense input 5 v in input voltage ? block diagram +
L4120 preliminary cmos ic unisonic technologies co., ltd 3 of 4 www.unisonic.com.tw qw-r125-031.a ? absolute maximum rating parameter symbol ratings unit input voltage v in -0.3~+40 v i sense voltage v in 5v v isense v in +0.3~v in -5 v v in <5v v in +0.3~ -0.3 v lx output voltage v l x -0.3~+40 v adjust pin input voltage v adj -0.3~+6 v switch output current i l x 1.5 a power dissipation p tot 0.5 w operating temperature t op -40~105 c storage temperature t stg -55~150 c junction temperature t j 150 c junction to ambient ja 180 c/w 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 oper ation is not implied. ? electrical characteristics (v in =12v, t amb =25c unless otherwise stated) (note 1) parameter symbol test conditions min typ max unit input voltage v in 6 40 v quiescent supply current with output off i inqoff adj pin grounded 400 a quiescent supply current with output switching i inqon adj pin floating 1000 a mean current sense threshold voltage v sense 115 mv sense threshold hysteresis v sensehys 15 % external control voltage range on adj pin for dc brightness control v adj 0.3 1.2 v dc voltage on adj pin to switch chip from active (on) state to quiescent (off) state v adjoff v adj falling 0.15 0.2 0.25 v dc voltage on adj pin to switch chip from quiescent (off) state to active (on) state v adjon v adj rising 0.2 0.25 0.3 v resistance between adj pin and v ref r adj 500 k ? continuous lx switch current i lxmean 1.2 a lx switch ?on? resistance r lx 0.4 ? lx switch leakage current i lx ( leak ) 1 a minimum switch ?on? time t onmin lx switch ?on? 200 ns minimum switch ?off? time t offmin lx switch ?off? 200 ns typical dimming ratio ddim f=100hz, v in =15v, 1led, l=27 h 1200:1 recommended maximum operating frequency f lxmax 1 mhz recommended duty cycle range of output switch at f lxma x d lx 0.3 0.7 0.9 internal comparator propagation delay t pd 50 ns thermal shutdown temperature t sd 150 c thermal shutdown hysteresis t sd-hys 20 c note: production testing of the chip is performed at 25c. functional operati on of the chip and par ameters specified are guaranteed by design, characterization and process control in other temperature.
L4120 preliminary cmos ic unisonic technologies co., ltd 4 of 4 www.unisonic.com.tw qw-r125-031.a ? typical application circuit 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.
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