unisonic technologies co., ltd uh378 linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2010 unisonic technologies co., ltd qw-r118-012.a ? ordering information ? pin description complementary outputs hall effect latch ic ? description the utc uh378 is a latch-type hall effect sensor with built-in complementary output driv ers. it?s composed of internal temperature compensation circuit and built-in protection diode to prevent reverse power fault. it is aimed for brush-less dc fan. the outputs of the uh378 operate as the hysteresis characteristics. the outputs al ternately switch between on and off when either the magnetic flux density is larger than threshold b op or the magnetic flux density is lower than b rp . ? features * widen power supply range from 3v ~ 20v. * on-chip hall sensor with excellent hysteresis. * build-in reverse protection diode. * ttl and mos ic are directly drivable by the output * the life is semi permanent because it employs contact-less parts ordering number lead free halogen free package packing uh378l-g04-k UH378G-G04-K sip-4 bulk pin no. pin name p/i/o description 1 v cc p positive power supply 2 do o output pin 3 dob o output pin 4 v ss p ground
uh378 linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r118-012.a ? block diagram 1 v cc reg. hall sensor dob v ss do 1 4 3 2 ? sensor locations
uh378 linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r118-012.a ? absolute maximum rating (ta=25 ) ? electrical characteristics (ta =25 , unless otherwise specified) ? magnetic characteristics a grade b grade c grade parameter symbol ratings unit supply voltage v cc 20 v reverse v cc polarity voltage v rcc -25 v circuit current i o 20 ma magnetic flux density b unlimited power dissipation p d 500 mw junction temperature t j +150 operating temperature t opr -20 ~ +85 storage temperature t stg -65 ~ +150 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. parameter symbol test conditions min typ max unit v cc = 14v, i out =5ma - 0.5 0.7 low-level output voltage v ol v cc = 3.6v, i out =5ma 0.4 0.7 v output leakage current i cex v cc =14v - 1 10 ua v cc =14v - 4.7 5 supply current i cc v cc =3.6v 4.6 5 ma t r v cc =14v, r l =10k ? , c l =10pf - - 5 output switching time t f v cc =14v, r l =10k ? , c l =10pf 2 us parametr symbol min typ max unit operate point b op 5 50 g release point b rp -50 -5 g hysteresis b hys 20 100 g parametr symbol min typ max unit operate point b op 5 70 g release point b rp -70 -5 g hysteresis b hys 20 140 g parametr symbol min typ max unit operate point b op 100 g release point b rp -100 g hysteresis b hys 20 200 g
uh378 linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r118-012.a ? test circuit 14v dob r l1 r l2 c l1 c l2 do utc uh378 10k 10pf 10pf 10k ? chysteresis characteristics o u t p u t v o l t a g e i n v o l t s o u t p u t v o l t a g e i n v o l t s
uh378 linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r118-012.a ? typical application circuit 4.7u/400v 1k 2w 15v 4.7u/400v uh378 680 10k 10k 1n45 1n45 220 v
uh378 linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r118-012.a ? performance characteristics 75 50 0 12 20 b rp supply voltage (v) typical magnetic switch point vs.supply voltage 25 -25 524 b op b hys 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. ta( ) 25 50 60 70 80 85 90 95 100 105 110 115 120 p d (mw) 550 525 515 505 485 475 465 455 445 425 405 385 365 ta=-20 ta=25 ta=-80
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