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unisonic technologies co., ltd sk6908 linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2007 unisonic technologies co., ltd qw-r109-025.b single-phase dc-fan motor driver ? description sk6908 is a single-phase driver for dc-fan motors. it provides high efficiency, low noise output and supports the functions of motor lock protection, auto restart and rotation detection. ? features *wide supply voltage range of 2.5v to 20v *output current i o(max) =600ma *operate with hall element *lock protection *auto-restart when the motor lock is undone *fg(frequency generator) output *package type sop-8 and hsop-8 expose *pb-free plating product number: sk6908l ? ordering information ordering number normal lead free plating package packing sk6908-s08-r sk6908l-s08-r sop-8 tape reel sk6908-s08-t sk6908l-s08-t sop-8 tube SK6908-SH2-R sk6908l-sh2-r hsop-8 tape reel sk6908-sh2-t sk6908l-sh2-t hsop-8 tube sk6908l-s08-r (1)packing type (2)package type (3)lead plating (1) r: tape reel, t: tube (2) s08: sop-8, sh2: hsop-8 (3) l: lead free plating, blank: pb/sn
sk6908 linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r109-025.b ? pin configuration v cc h- out1 h+ 1 2 3 4 8 7 5 6 c t fg gnd out2 ? block diagram regulator control block lock protection autorestart block gnd fg output vcc h+ ct h- hysteresis amplifier tsd out 1 out 2
sk6908 linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r109-025.b ? absolute maximum ratings (ta = 25
) parameter symbol ratings unit supply voltage v cc 20 v supply current i cc 20 ma circuit current i o 600 ma fg output current i fg 20 ma sop-8 700 mw power dissipation (derate at ta=25 reduce 5.5mw/

) hsop-8 p d 1000 mw output voltage v out 20 v hall input common mode voltage range v hic 1.0 ~ vcc-0.5 v operating temperature t opr -20 ~ +100(note1)
storage temperature t stg -55 ~ +150
note 1.for operation in ambient temperatures above 25 ,the driver device must be derated based on a 150

maximum temperature note 2.absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only an d functional device operat ion is not implied. note 3.the device is guaranteed to meet performance specification within 0 ~+70 operating temperature range and assured by design from -20 ~+100 . ? electrical characteristics (ta=25
, v cc =5v) parameter symbo l conditions min typ max unit in drive mode (c t =l) 8 ma current drain i cc in lockup protection mode (c t =h ) 4.1 ma lockup detection capacitor charge current i ct1 v 1pin = 1.1v 2 2.8 4 ua capacitor discharge current i ct2 v 1pin = 1.1v 0.3 0.5 0.8 ua capacitor charge/discharge current ratio r ct 5.6 ct charge voltage v ct1 1.9 v ct discharge voltage v ct2 0.7 v output low level voltage v ol i o =200ma 0.3 0.7 v output high level voltage v oh i o =200ma 3.9 4.1 v hall input sensitivity v hin zero peak value (including offset and hysteresis) 3 15 mv hall input-output gain g ho 320 500 680 fg output pin low voltage v fg i fg =5ma 0.3 0.5 v fg output pin leakage current i fg(leak) v fg =15v 0 10 ua ? hall single input-output truth value table h+ h- out1 out2 fg h l h l h l h l h l * ct=0v
sk6908 linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r109-025.b ? lockup protection / automatic recovery fig. 1 t off t on motor lock detect lock lock cancel release depend on the hall output h+ out1 fg v ct1 v ct2 ton (charge time) = c (v ct1 -v ct2 ) i ct1 t off (charge time) = c (v ct1 -v ct2 ) i ct2 c : value of capcitor at ct terminal
sk6908 linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r109-025.b ? power dissipation fig.-2 the maximum junctions temperature is 150c in plastic pac kages, but for reasons of reliability, a lower number may be mandated. p t = t j(max) ? ta (max) / ja p t = total power dissipated by the device t j (max) = maximum junction temperature ta (max) = maximum ambient temperature ja = 175c/w ? thermal shutdown (tsd) fig.-3 175
150
output off output on tsd on tsd off junction temperature (
) tsd on ( typ : 175
) tsd off ( typ : 150
)
sk6908 linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r109-025.b ? typical application circuit 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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