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unisonic technologies co., ltd ulw2091 preliminary linear integrated circuit www.unisonic.com.tw 1 of 12 copyright ? 2016 unisonic technologies co., ltd qw-r125-044.c non isolated buck constant current led driver ic ? description ulw2091 is a high precision led buck constant current driver chip. the chip operates in the inductor current critical continuous mode, which is suitable for t he non isolated buck led constant current power supply with 85vac~265vac full range input voltage. ulw2091 chip integrated 500v power switch by patent demagnetization detection technol ogy and high voltage power supply technology, without detection and power supply for auxiliary winding, the peripheral devices are more simple, saving the cost and volume of the system. ulw2091 chip with high precision current sampling circuit, while the use of patent ed constant current control technology to achieve high accuracy of the led constant current output and excellent line voltage regulator. t he chip operates in the critical mode of inductor current and the out put current is not changed with the increase of the inductance and the working voltage of led. ulw2091 has a variety of protection features, including led short circuit protection, under volt age protection, over temperature adjustment function and so on. ? features 1 2 3 to-92 1 sot-23-3 (jedec to-236) 1 2 3 sot-89 1 sot-23 (jedec sc-59) hsop-8 * the integrated 500v power mos. * the integrated high voltage power supply function. * the inductor current cr itical continuous mode. * without auxiliary winding detection and power supply. * the wide voltage input voltage. * 5% led output current accuracy. * the led short circuit and open circuit protection. * the chip power supply under voltage protection. * the regulating func tion of overheating
ulw2091 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 12 www.unisonic.com.tw qw-r125-044.c ? ordering information ordering number lead free halogen free package packing - ULW2091G-AB3-R sot-89 tape reel - ulw2091g-ae2-r sot-23-3 tape reel - ulw2091g-ae3-r sot-23 tape reel - ulw2091g-sh2-r hsop-8 tape reel ulw2091l-t92-b ulw2091g-t92-b to-92 tape box ulw2091l-t92-k ulw2091g-t92-k to-92 bulk ? marking sot-23-3 / sot-23 sot-89 hsop-8 to-92
ulw2091 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 12 www.unisonic.com.tw qw-r125-044.c ? pin configuration drain cs v dd v dd drain cs sot-23 / sot-23-3 to-92 1 2 3 1 2 3 cs drain 1 2 3 4 8 7 6 5 cs cs cs nc nc v dd hsop-8 cs 123 v dd drain cs sot-89 ? pin description pin no. sot-23 sot-23-3 sot-89 hsop-8 to-92 pin name description 1 2 1 1 v dd power supply 2 1 4 3 drain the internal high-voltage drain 3 3 5, 6, 7, 8 2 cs float ground and current sampling pin - - 2, 3 - nc
ulw2091 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 12 www.unisonic.com.tw qw-r125-044.c ? block diagram
ulw2091 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 12 www.unisonic.com.tw qw-r125-044.c ? absolute maximum rating (t a =25c, unless otherwise specified) parameter symbol ratings unit input voltage v in -0.3 ~ 550 v supply voltage v dd -0.3 ~ 8.5 v sot-23 sot-23-3 300 mw sot-89 mw hsop-8 mw power dissipation to-92 p d 625 mw junction temperature t j -45 ~ +125 c storage temperature t stg -55 ~ +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 operation conditions parameter symbol ratings unit input voltage v in 140 ~ 375 v supply voltage v dd 7 ~ 8 v reference load current i load 0 ~ 200 ma ambient temperature t a 0 ~ +70 c ? thermal resistance s characteristics parameter symbol rating unit sot-23 sot-23-3 416 c/w sot-89 c/w hsop-8 c/w junction to ambient to-92 ja 200 c/w
ulw2091 preliminary linear integrated circuit unisonic technologies co., ltd 6 of 12 www.unisonic.com.tw qw-r125-044.c ? electrical characteristics (t a =25c, unless otherwise specified) parameter symbol test conditions min typ max unit power supply section input voltage v in 85 220 265 v chip operating voltage v dd drain=100v 7 7.3 7.8 v chip starting voltage v dd_on v dd rise 6 6.2 6.5 v chip starting current i st v dd =6.2v 0.5 1 2 ma chip operating current i cc 120 180 300 ua power efficiency i led =100ma 0.88 power factor p f i led =100ma 0.4 0.5 0.7 cc section the precision of c onstant current cc i led =0ma~200ma 5 % standby power consumption 0.3 w protection section short circuit protection frequency f st v in =220ac rcs=3 ? 2 3 4 khz current detection threshold v cs_th 580 600 620 mv edge blanking time t leb 500 ns turn off delay time t off_delay 200 ns time control section minimum turn off time t off_min 2.5 us maximum turn off time t off_max 300 us maximum turn-on time t on_max 40 us power mos section ldmos withstand voltage b v 500 550 600 v conduction resistance ron i ds =0.1a 30 ? temper section over temper adjust 140 c over temper protect 160 c over temper hysteresis 20 c notes: 1. the parameters are not 100% tested in production. 2. the minimum, maximum range of st andard specification by the test to ensure, typical values by design, test or analysis to ensure.
ulw2091 preliminary linear integrated circuit unisonic technologies co., ltd 7 of 12 www.unisonic.com.tw qw-r125-044.c ? typical application circuit
ulw2091 preliminary linear integrated circuit unisonic technologies co., ltd 8 of 12 www.unisonic.com.tw qw-r125-044.c ? typical application circuit (cont.) c in c1 c2 ac l0 led r2 3 1 2 cs drain v dd to-92 d1 d5 d3 d4 d2 r1 u1
ulw2091 preliminary linear integrated circuit unisonic technologies co., ltd 9 of 12 www.unisonic.com.tw qw-r125-044.c ? typical application circuit (cont.) bom reference component r1 750k, 1206 r2 3 ? , 1206 c1 2.2nf / 1kv, 1206 c2 2.2nf / 50v, 0805 c in 6.8 f, 400v d1 ~ d4 1n4007 d5 es1j, sma l0 4.7mh u1 ulw2091
ulw2091 preliminary linear integrated circuit unisonic technologies co., ltd 10 of 12 www.unisonic.com.tw qw-r125-044.c ? application information ulw2091 is a constant current driver ic for led lighting, which is applied to the non isolated led driver power supply. the 500v power switch is integrated in the chip, which is based on the constant current architecture and control method, and it can achieve excellent constant current characteristics with minimal external components. and without auxiliary winding power supply a nd testing, the system cost is very low. start after the system is powered up, the input voltage is charged on the v dd pin through the jfet, and when the v dd voltage reaches the threshold value, t he chip's internal reference circuit begins to work. when the chip is working normally, the required operating current is still through the supply of internal consumption. constant current control the chip is detected the peak current, and the rcs re sistance is connected to the input terminal of the peak comparator, which is compared with the threshold volta ge 0.6v. when the rcs voltage reaches the threshold, the led current is adjusted, and realiz ed the constant cu rrent control. the formula for calculating the inductor peak current is i pk =600/rcs (ma). among them, rcs is a current sampling resistor. the output of the comparator cs also in cludes a 500ns leading edge blanking time. the formula for calculating the led average current is iled=i pk /2. among them, i pk is the inductor peak current. protection function ulw2091 built in a variety of protection functions, including led short-circuit protection, led open circuit protection, sampling circuit short-circuit protecti on, temperature regulation and protection, etc. when led short circuit, the system works in the 3 khz lo w frequency, so the power consumption is very low. over temperature adjustment function ulw2091 has the function of over temperature adjustment, the output current is gr adually reduced when the driving power is over, so that the output power and temperat ure rise is controlled, the po wer supply is maintained at the set value, in order to improve the reliability of the system, the chip is internally set to adjust the temperature of the 140c. pcb design in the design of pcb, you need to follow the following guidelines: v dd bypass capacitor is required to close the v dd pin of the chip. rcs resistor requires close to the cs pin of the chip between rcs and v dd bypass capacitor resistor connected to the copper foil as short as possible cs pin increases in the area of c opper clad to improve chip cooling.
ulw2091 preliminary linear integrated circuit unisonic technologies co., ltd 11 of 12 www.unisonic.com.tw qw-r125-044.c ? test circuit table 1. efficiency and power factor test v i pf v o (v) i o (a) p i (w) 85v --- 61 0.096 2 6.6 88.91% 115v 0.552 61 0.1031 7.04 89.33% 132v --- 60.4 0.102 6.92 89.03% 180v --- 117 0.1026 12.9 93.06% 230v 0.496 116 0.1008 12.65 92.43% 264v --- 116 0.1006 12.64 92.32% table 2. line regulation & load regulation test v led v in 60v 80v 120v load regulation% 180vac 0.1042 0.104 0.1042 0.1% 230vac 0.1043 0.1038 0.1021 1.1% 264vac 0.1045 0.1038 0.1017 1.4% line regulation% 0.15% 0.1% 1.25% crucial waveforms v in =115v, f sw =33khz v in =230v, f sw =66khz short circuit protection test over-temperature protection test
ulw2091 preliminary linear integrated circuit unisonic technologies co., ltd 12 of 12 www.unisonic.com.tw qw-r125-044.c ? typical characteristics l n 6.8 f es1j 4.7mh 2.2nf 750k 3 ? 2.2nf u1 cs v dd drain 1 2 3 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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