unisonic technologies co., ltd tl431ll preliminary linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2013 unisonic technologies co., ltd qw-r103-072.a low cathode current adjustable precision shunt regulator ? description the utc tl431ll is an adjustable shunt regulator with three-terminal and thermal stable with full operation range. it features include sharp turn-on characteristics, low output impedance and low temperature coefficient, so zener diode can be replaced by utc tl431ll in many applications, for example, charger devices, switching power supply and other adjustable regulators. any value between v ref (2.5v) and the corresponding maximum cathode voltage (36v) can be set to by utc tl431ll . the utc tl431ll is offered in two grade initial voltage tolerance at 25c, 0.5%, and 1%. ? features * high stability under capacitive load * programmable precise output voltage from 2.5v to 36v * sink current capacity from 50a to 100ma * low minimum cathode current for regulation: 10a (typ.), 50a (max.) * low temperature deviation: 4.5mv typical * low output noise * wide operating range: -40c~125c ? ordering information ordering number package pin assignment packing lead free halogen free 1 2 3 tl431llk-ae2-r TL431LLG-AE2-R sot-23-3 k r a tape reel note: pin code: k: cathode r: reference a: anode ? marking 4cll l: lead free g: halogen free
tl431ll preliminary linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r103-072.a ? block diagram
tl431ll preliminary linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r103-072.a ? absolute maximum rating parameter symbol ratings unit cathode voltage v ka 40 v cathode current range (continuous) i ka -100~150 ma reference input current range i ref 10 ma power dissipation p d 370 mw junction temperature t j 150 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 oper ation is not implied. ? recommended operating conditions parameter symbol ratings unit cathode voltage v ka v ref ~36 v cathode current i ka 0.05~100 ma operating ambient temperature range t a -40~125 c ? thermal data parameter symbol ratings unit junction to case jc 113 /w ? electrical characteristics (t a =25c, unless otherwise specified.) parameter test circuit symbol test conditions min typ max unit reference voltage 0.5% 1 v ref v ka =v ref , i ka =10ma 2.487 2.500 2.512 v 1.0% 2.475 2.500 2.525 v deviation of reference voltage over full temperature range 1 ? v ref v ka =v ref , i ka =10ma 0~70c 4.5 8 mv -40~85c 4.5 10 mv -40~125c 4.5 16 mv ratio of change in reference voltage to the change in cathode voltage 2 ? v ref ? v ka i ka =10ma ? v ka =10v~v ref -1.0 -2.7 mv/v ? v ka =36v~10v -0.5 -2.0 mv/v reference current 2 i ref i ka =10ma, r1=10k ? , r2= 0.035 0.5 a deviation of reference current over full temperature range 2 ? i ref i ka =10ma, r1=10k ? , r2= , t a =-40~125c 0.03 0.3 a minimum cathode current for regulation 1 i ka (min) v ka =v ref 10 50 a off-state cathode current 3 i ka (off) v ka =36v, v ref =0 0.05 1.0 a dynamic impedance 1 z ka v ka =v ref , i ka =1~100ma, f 1.0khz 0.5 ?
tl431ll preliminary linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r103-072.a ? test circuit v in r1 v ka i ka v ref figure 1. test circuit 4 for v ka =v ref r1 r2 v ref v ka i ka r3 v in i ref v ka =v ref (1+r1/r2)+i ref r1 figure 2. test circuit 5 for v ka >v ref v in r1 v ka i off figure 3. test circuit 6 for i off
tl431ll preliminary linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r103-072.a ? typical application circuit r1 r2 v out r3 v in v out =(1+r1/r2)v ref figure 4. shunt regulator v ref r2 r3 v out r1 v in v ref r4 v out =(1+r2/r3)v ref figure 5. high current shunt regulator r1 v in r2 i out i out =v ref /r2+i ka figure 6. current source or current limit
tl431ll preliminary linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r103-072.a 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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