unisonic technologies co., ltd uh288f/r linear integrated circuit www.unisonic.com.tw 1 of 4 copyright ? 2016 unisonic technologies co., ltd qw-r118-029.a complementary output hall effect fan driver ? description utc uh288f (fg)/ uh288r (rd) are integrated hall sensors with output drivers, mainly designed for electronic commutation of brush-less dc fan. this ic is using hv bcd process internally includes the regulator, protecting diode, hall plate, amplifier, comparator, and a pair of comple mentary open-drain outputs (do, dob). to avoid coil burning, rotor-lock shutdown detection circuit shut down the output driver if the rotor is blocked and then the automatic recovery circuit will try to restart the motor. this function repeats while rotor is blocked. until the blocki ng is removed, the motor recovers running normally. ? features * wide operating voltage range: 4v~28v * output sink current up to 0.3a * on-chip high sensitivity hall-effect sensor * thermal shutdown protection * low output switching current noise * -40c ~ 85c oper ating temperature * rotor-locked shutdown and aut omatically restart function * for 12v and 24v dc motor / fan systems ? ordering information ordering number package packing UH288FG-G04-K sip-4 bulk uh288rg-g04-k sip-4 bulk ? marking
uh288f/r linear integrated circuit unisonic technologies co., ltd 2 of 4 www.unisonic.com.tw qw-r118-029.a ? pin description pin no. pin name description 1 fg/rd frequency generator / rotation detection output 2 do output 1 3 dob output 2 4 gnd ground. ? block diagram ? sensor locations
uh288f/r linear integrated circuit unisonic technologies co., ltd 3 of 4 www.unisonic.com.tw qw-r118-029.a ? absolute maximum ratings (t a =25c, unless otherwise specified) parameter symbol ratings unit fan supply voltage v cc 28 v fg/rd voltage v fg 28 v fg/rd sink current i fg 20 ma magnetic flux density b unlimited gauss continuous 300 hold 500 output current peak (start up) i o 700 ma power dissipation p d 550 mw ambient temperature t a -40 ~ +85 c storage temperature range 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. ? thermal data parameter symbol ratings unit junction to ambient ja 227 c/w junction to case jc 49 c/w ? electrical characteristics (v dd =12v, t a =25c, unless otherwise specified) parameter symbol test conditions min typ max unit supply voltage v dd operating 4 28 v supply current i dd operating 3.5 5 ma output leakage current i off v out =12v < 0.1 10 a output on resistance r ds(on) i out =200ma 2.3 ? output clamping voltage v z do, dob 58 v fg/rd off leakage current 1 a fg/rd on saturation voltage von 10ma 0.5 v locked protection on t lrp-on 0.45 sec locked protection off t lrp-off 2.7 sec thermal shutdown temp t sd 150 c thermal shutdown hysteresis t sh 30 c ? magnetic characteristics (t a =25c, unless otherwise specified) (1mt=10gauss) parameter symbol min typ max unit operate point b op 5 30 50 gauss release point b rp -50 -30 -5 gauss hysteresis b hys 60 gauss ? driver output vs. magnetic pole characteristics test conditions do dob north pole b < brp high low south pole b > bop low high note: the magnetic pole is applied facing the branded side of the package.
uh288f/r linear integrated circuit unisonic technologies co., ltd 4 of 4 www.unisonic.com.tw qw-r118-029.a ? chysteresis characteristics ? typical application circuit 12v brush-less dc fan notes: 1. c1 (optional) is for power stabilization, recommended e-cap 1uf/50v 2. d1 (optional) is a reverse protect diode. utc assumes no respon sibility for equipment failures that result fr om 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 writ ten 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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