unisonic technologies co., ltd f2967 preliminary linear integrated circuit www.unisonic.com.tw 1 of 9 copyright ? 2013 unisonic technologies co., ltd qw-r109-036.a for variable speed fan motor single-phase full-wave pre-driver ? description the utc f2967 is a single-phase fan motor pre-driver ic. this ic has variable speed function that works with an external pulse-width modulation signal. a quiet and low power consumption motor driver circui t can be implemented by adding a small number of external components. this ic is optimal for driving large scale fan motors (with large air volume and large current) such as those used in servers and consumer products. ? features * single-phase full-wave drive * variable speed control with external pwm input * current limiter circuit * reactive current cut circuit * compatible with 12v, 24v, and 48v power supplies * minimum speed setting pin * reference voltage output pin for hall bias * automatic reset and lock protec tion functions incorporated * (rotation speed detection), rd (lock detection) output tssop-20 ? ordering information ordering number package packing lead free halogen free F2967L-P20-T f2967g-p20-t tssop-20 tube f2967l-p20-r f2967g-p20-r tssop-20 tape reel
f2967 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 9 www.unisonic.com.tw qw-r109-036.a ? pin configuration out2p out2n v cc vlim sense rmi vth cpwm fg rd 10 9 8 7 6 5 4 3 2 1out1p out1n vover sgnd 6vreg roff ct in+ hb in- 20 19 18 17 16 15 14 13 12 11 utc f2967 ? pin description pin no. pin name description 1 out2p output2p 2 out2n output2n 3 vcc power supply 4 vlim setting limit current pin 5 sense sense pin of current limiter 6 rmi lowest speed setting voltage 7 vth variable speed function input 8 cpwm pwm oscillator frequency setting capacitor 9 fg speed detection output 10 rd lock detection output 11 in- the hall sensor input 12 hb power the hall sensor 1.25v 13 in+ the hall sensor input 14 ct setting lock protection time 15 roff the pin sets soft switching time 16 6vreg vref 6v 17 sgnd logic gnd 18 vover the pin for constant vcc voltage 19 out1n output2p 20 out1p output2n
f2967 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 9 www.unisonic.com.tw qw-r109-036.a ? block diagram discharge circuit ct discharge pulse v cc 6vreg 6vreg roff hall-bias hb in+ in- hysteresis amp otp rmi vth cpwm osc vlim sense sgnd out2p out2n out1p out1n rd fg controller
f2967 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 9 www.unisonic.com.tw qw-r109-036.a ? absolute maximum rating (t a =25c) parameter symbol ratings unit maximum supply voltage v cc v cc ma x 18 v maximum output current i out ma x 50 ma output withstand voltage v out ma x 18 v hb maximum output current hb 10 ma vth input pin withstand voltage v th ma x 8 v rd/fg output pin out put withstand voltage f g ma x 18 v rd/fg output current f g ma x 10 ma allowable power dissipation mounted on a specified board (note 2) p d max 800 mw operating temperature t opr -30~+95 c storage temperature t stg -55~+150 c notes: 1. 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. 2. mounted on a specified board (114.3mm76.1mm1.6mm, glass epoxy) ? recommended operating range (t a =25c) parameter symbol ratings unit v cc supply voltage v cc 6~16 v vth input level voltage range full speed mode v th 0~7 v hall input common phase input voltage range v icm 0.2~3 v ? electrical characteristics (t a =25c, v cc =12v, unless otherwise specified) parameter symbol test conditions min typ max unit circuit current i cc 1 during drive 6 10 14 ma i cc 2 during lock protection 6 10 14 ma 6vreg voltage 6 vreg i 6vreg =5ma 5.80 6.0 6.15 v vover voltage v over 12.0 12.8 13.6 v cpwm-h voltage v crh 4.35 4.55 4.75 v cpwm-l voltage v crl 1.45 1.65 1.85 v cpwm oscillation frequency f pwm c=100pf 18 25 32 khz ct pin h voltage v cth 3.4 3.6 3.8 v ct pin l voltage v ctl 1.4 1.6 1.8 v ict pin charge current i ct1 1.6 2.0 2.5 a ict pin discharge current i ct2 0.16 0.20 0.28 a ict charge/discharge current ratio r ct 8 10 12 deg out-n output voltage v on i o =20ma 4 10 v out-p sink current i op 15 20 ma sensitivity of hall input v hn zero peak value (including offset and hysteresis) 10 20 mv rd/fg output pin l voltage v fg i fg =5ma 0.15 0.3 v rd/fg output pin leak current i fgl v fg =16v 30 a
f2967 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 9 www.unisonic.com.tw qw-r109-036.a ? truth table during full-speed rotation in- in+ ct out1p out1n out2p out2n fg rd mode h l l l - - h l l out1 2 drive l h - - h l - off - out2 1 drive h l h off - - h l off lock protection l h - h off - off - - vth cpwm in- in+ out1p out1n out2p out2n mode l h h l l - - h out1 2 drive l h - h l - out2 1 drive h l h l off - - h during rotation regeneration in lower tr l h - h off -
f2967 preliminary linear integrated circuit unisonic technologies co., ltd 6 of 9 www.unisonic.com.tw qw-r109-036.a ? control timing chart (1) minimum speed setting (stop) mode input of pwm-in is filtered to generate the vth voltage. at low speed, the fan rotates with the minimum speed set with rmi pin during low speed. if the minimum s peed is not set (rmi=6vreg), the fan stops. (2) low ? high speed mode pwm control is made through comparison of oscillati on and vth voltages with cpwm changing between 1.6v ? 4.6v. when the vth voltage is lower, the ic switches to dr ive mode. when the vth voltag e is higher, the p-channel fet is turned off and coil current is regenerated through t he low-side fet. therefore, as the vth voltage lowers, the output on-duty increases, increasing the coil current and raising the motor speed. the rotation speed is fed back by the fg output. (3) full speed mode the full-speed mode becomes effective with the vth voltage of 1.65v or less. (vth must be equal to gnd when the speed control is not to be made.) (4) pwm-in input disconnection mode while the input pin of pwm-in is disconnected, vth becom es 1.65v or les and the output enables full drive at 100%. the fan runs at full speed. (ref er to the sample application circuit.)
f2967 preliminary linear integrated circuit unisonic technologies co., ltd 7 of 9 www.unisonic.com.tw qw-r109-036.a ? typical application circuit 12v sample application circuit v z =18v sop8901 rf cb=to 0.022f rb=10k rout=100 rfg, rrd=10k ~100k hall v cc vover hb in- in+ rmi vth cpwm ct sgnd rd fg sense vlim 6vreg roff out1p out1n out2p out2n pwm-in cp=100pf 25khz ct=0.47f r=0~5k 6vreg
f2967 preliminary linear integrated circuit unisonic technologies co., ltd 8 of 9 www.unisonic.com.tw qw-r109-036.a ? typical application circuit(cont.) 24v, 48v sample application circuit rf 6vreg v cc vover rmi vth cpwm ct sgnd rd fg sense vlim 6vreg roff out1p out1n out2p out2n pwm-in cp=100pf ct=0.47f hall hb in- in+
f2967 preliminary linear integrated circuit unisonic technologies co., ltd 9 of 9 www.unisonic.com.tw qw-r109-036.a 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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