unisonic technologies co., ltd f6908 linear integrated circuit www.unisonic.com.tw 1 of 7 copyright ? 2015 unisonic technologies co., ltd. qw-r109-016.f single-phase full- w ave motor driver for fan motor ? description utc f6908 is a single-phase full-wave motor driver for fan motor suitable for 5v and 12v operations. ? features * soft switching drive for low noise * lock detection and automatic restart function * thermal shut-down protection sop-8 hsop-8 msop-8 ? ordering information ordering number package packing F6908G-S08-R sop-8 tape reel f6908g-sh2-r hsop-8 tape reel f6908g-sm1-r msop-8 tape reel ? marking
f6908 linear integrated circuit unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r109-016.f ? pin configuration ? pin description pin no pin name function 1 out2 output 2 2 ho hall signal output pin 3 ld capacitor terminal for lock detection, auto restart 4 v cc power supply pin 5 h+ hall signal input pin + 6 h- hall signal input pin - 7 out1 output 1 8 gnd ground
f6908 linear integrated circuit unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r109-016.f ? block diagram + - + - + - hall amp tsd control lock detection and restart reg 5 hall 7 8 1 2 3 4 6 m out 1 out 2 cs ? hall signal input-output truth table h+ h- out1 out2 ho h l h l h l h l h l condition: ld=0v
f6908 linear integrated circuit unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r109-016.f ? absolute maximum ratings (t a =25c, unless otherwise specified) parameter symbol ratings unit supply voltage v cc 15 v output voltage v out 15 v hall signal output voltage v ho 15 v output current i out 0.7(note 2) a hall signal output current i ho 15 ma power dissipation sop-8/hsop-8 p d 687 (note 3) mw msop-8 390 junction temperature t j +150 c operating temperature t opr -20 ~ +100 c storage temperature t stg -40 ~ +150 c notes: 1. absolute maximum ratings are those val ues beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. 2. this value is not to be over p d and aso. 3. to use at temperature above t a = 25c reduce 5.5 mw/c. (on 70.0mm70.0mm1.6mm glass epoxy board) ? recommended operating conditions (t a =25c, unless otherwise specified) parameter symbol ratings unit supply voltage v cc 3 ~ 14 v ? electrical characteristics (t a =25c, v cc =5v, unless otherwise specified) parameter symbol test conditions min typ max unit clamp voltage of capacitor for lock detection v ldcl 1.14 1.80 2.47 v reference voltage of capacitor for lock detection v ldcp 0.47 0.76 1.06 v output voltage l v ol i out =200ma 0.2 0.3 v output voltage h v oh i out =200ma 3.9 4.1 v ?ho? terminal voltage l v hol i ho =5ma 0.3 0.5 v supply current icc at output: off 1.5 3.4 8.7 ma charge current of capacitor for lock detection i ldc v ld =1.1v 1.50 2.75 4.50 a discharge current of capacitor for lock detection i ldd v ld =1.1v 0.24 0.48 0.90 a ?ho? terminal leak current i hol v ho =15v 0 50 a charge-discharge current ratio of capacitor for lock detection r cd r cd =i ldc /i ldd 4.2 5.7 9.5 hall input offset voltage h ofs -10 10 mv hall input-output gain gho 320 500 680 thermal shutdown 150 c tsd hysteresis tsd 25 c
f6908 linear integrated circuit unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r109-016.f ? power derating cure ? lock detect circuit, automatic restart circuit charge and discharge time at motor lock condition varies with the value of external capacitor at ld terminal, and is given by the following equation. ldc ldcp ldcl on i v v c e ch t ) - ( time) arg ( ? ? ldd ldcp ldcl off i ) v - v ( c = time) e arg disch ( t c: capacitor at ld pin the following value shows charge time and discharge time at c=0.47f for reference. charge time =0.18s (output: on) discharge time = 1.02s (output: off)
f6908 linear integrated circuit unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r109-016.f ? shows timing chart of ld pin
f6908 linear integrated circuit unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r109-016.f ? cautions (1) power dissipation ic power dissipation varies widely with supply voltage, output current and application of ic. please pay attention not to exceed the allowable power rating. (2) hall signal input terminals (h+, h-) v cc v cc -2v 1/2 v cc gnd fig.2 hall amp input bias voltage range a. hall signal amplitude should be key within range 0v ~ v cc -2v. b. the output signal of this ic is the amplified by about 500 times of hall input signal coith pattern shown below for different leuel ok signal input. 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 lif e support appliances, devices or systems where malfunction of these products can be reasonably expe cted 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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