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data sheet two phase dual-coil cmos smart fan motor driver ah9279 oct. 2011 rev. 1. 3 bcd semiconductor manuf acturing limited 1 general description the ah9279 is a most ad vanced fan control and drive hall ic manufactured by special cmos process. this ic consists of voltage reference, hall sensor, signal amplifier, wave shaping circuit, locked rotor detector, locked rotor protection and restart circuit, output drive circuit, etc.. to allow survival in a harsh environment and in consideration of low cost, the ah9279 has been designed with many functions internally, and requires less external components. when there is no motion for one second, the ic will detect locked rotor conditions, enter protection mode automatically and disable two outputs for five seconds. then, it will turn on drive current from one channel for one second. if it still fails to detect fan rotation, the ah9279 will shut off the outputs for five seconds again. this sequence will be repeated until rotation condition is detected and the ic enters normal operation mode. this function prevents the chip from overheating and damage due to long time locked rotor. the power dissipation decides allowable maximum ambient temperature. low power dissipation of ah9279 and the output mos fet power transistor enable it to be used at ambient temperature up to 125 c on condition that the drive power is lower than 100mw or drive current is less than 200ma. the ah9279 is availabl e in TO-94 package. features ? on chip hall sensor ? built-in zener diodes protection for output driver ? power efficient cmos and power mosfet drivers allow 400ma without overheating ? 5v and 12v operation ? high sensitivity for switching symmetry ? locked rotor shutdown and auto restart ? esd rating: 4000v(human body model) 400v(machine model) applications ? dual-coil brushless dc fan figure 1. package type of ah9279 TO-94
data sheet two phase dual-coil cmos smart fan motor driver ah9279 oct. 2011 rev. 1. 3 bcd semiconductor manuf acturing limited 2 1 2 3 4 vcc do dob gnd pin configuration z4 package (TO-94) figure 2. pin configuration of ah9279 (front view) pin description pin number pin name function 1 vcc power supply pin 2 do output pin 1 3 dob output pin 2 4 gnd ground pin
data sheet two phase dual-coil cmos smart fan motor driver ah9279 oct. 2011 rev. 1. 3 bcd semiconductor manuf acturing limited 3 functional block diagram figure 3. functional block diagram of ah9279 ordering information ah9279 - circuit type package z4: TO-94 package temperature range part nu mber marking id packing type TO-94 -20 to 125 c ah9279z4-g1 9279z4-g1 bulk bcd semiconductor's pb-free products, as designated with "g1" suffix in the part number, are rohs compliant and green. g1: green
data sheet two phase dual-coil cmos smart fan motor driver ah9279 oct. 2011 rev. 1. 3 bcd semiconductor manuf acturing limited 4 absolute maximum ratings (t a =25 c, note 1) parameter symbol value unit supply voltage v cc 18 v supply current (fault) i cc 5 ma output current i out 500 ma power dissipation p d 550 mw thermal resistance (junction to ambient) ja 227 c /w storage temperature t stg -55 to 150 c esd (human body model) esd 4000 v esd (machine model) esd 400 v note 1: stresses greater than those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under ?recommended operating co nditions? is not implied. exposure to ?absolute maximum ratings? for extended periods may affect device reliability. recommended operating conditions parameter symbol min max unit supply voltage v cc 3.5 16 v ambient temperature t a -20 125 c
data sheet two phase dual-coil cmos smart fan motor driver ah9279 oct. 2011 rev. 1. 3 bcd semiconductor manuf acturing limited 5 electrical characteristics v cc =12v, t a =25c, unless otherwise specified. parameter symbol conditions min typ max unit supply voltage v cc operating 3.5 16 v supply current i cc average 3.5 5 ma output current i out 500 ma output leakage current i leakage v out =24v 0.1 10 a saturation voltage v sat i out =350ma 600 1000 mv output on time t on 0.8 s output off time t off 5 s output zener break-down voltage v z 35 v thermal resistance (junction to case) jc 49 c /w magnetic characteristics v cc =12v, t a =25c, unless otherwise specified. parameter symbol min typ max unit operating point b op 25 50 gauss releasing point b rp -50 -25 gauss hysteresis b hys 50 gauss
data sheet two phase dual-coil cmos smart fan motor driver ah9279 oct. 2011 rev. 1. 3 bcd semiconductor manuf acturing limited 6 n s marking side test circuit figure 4. basic test circuit of ah9279 -40 -20 0 20 40 0 2 4 6 8 10 12 magnetic flux density b(gs) do( v) v cc v sat -40 -20 0 20 40 0 2 4 6 8 10 12 magnetic flux density b(gs) dob(v) v cc v sat figure 5. v do vs. magnetic flux density figure 6. v dob vs. magnetic flux density
data sheet two phase dual-coil cmos smart fan motor driver ah9279 oct. 2011 rev. 1. 3 bcd semiconductor manuf acturing limited 7 4 6 8 1012141618 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 supply current (ma) supply voltage (v) t a =25 o c 4 6 8 10 12 14 16 18 -50 0 50 100 t a =25 o c b op /b rp /b hys (gauss) supply voltage (v) b op b rp b hys -20 0 20 40 60 80 100 120 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 supply current (ma) ambient temperature ( o c) t a =25 o c v cc =12v -20 0 20 40 60 80 100 120 200 300 400 500 600 700 800 900 saturation voltage (mv) ambient temperature ( o c) v cc =12v i out =350ma typical performance characteristics figure 7. supply current vs. supply voltage figure 8. supply current vs. ambient temperature figure 9. b op /b rp /b hys vs. supply voltage figure 10. saturation voltage vs. ambient temperature
data sheet two phase dual-coil cmos smart fan motor driver ah9279 oct. 2011 rev. 1. 3 bcd semiconductor manuf acturing limited 8 -20 0 20 40 60 80 100 120 -40 -30 -20 -10 0 10 20 30 40 b op /b rp /b hys (gauss) ambient temperature ( o c) b op b rp b hys -25 0 25 50 75 100 125 150 0 100 200 300 400 500 600 power dissipation (mw) ambient temperature ( o c) 100 200 300 400 500 0 200 400 600 800 1000 1200 saturation voltage (mv) output current (ma) t a =25 o c v cc =12v typical performance characteristics (continued) figure 11. saturation voltage vs. output current figure 12. power dissipation vs. ambient temperature figure 13. b op /b rp /b hys vs ambient temperature
data sheet two phase dual-coil cmos smart fan motor driver ah9279 oct. 2011 rev. 1. 3 bcd semiconductor manuf acturing limited 9 typical application ah9279 vcc do dob gnd v cc =5v or 12v c2 2.2 f c1 2.2 f r1 4.7 coil 1 coil 2 d1 r2 4.7 c3 2.2 f figure 14. typical application 1 of ah9279 (note 2) note 2: 1. d1 is an ordinary diode used to filter the noise from vcc and protect ic if vcc and gnd are plugged reversed. 2. c1=c2=c3=2.2 f typical, electrolytic capacitors are better. th ey should be fine tuned based on system design. 3. r1=r2=4.7 ? typical. they can be cancelled according to system requirement.
data sheet two phase dual-coil cmos smart fan motor driver ah9279 oct. 2011 rev. 1. 3 bcd semiconductor manuf acturing limited 10 typical application (continued) ah9279 vcc do dob gnd v cc =5v or 12v coil 1 coil 2 d1 c1 2.2 f zd1 35v zd2 35 v figure 15. typical application 2 of ah9279 (note 3) note 3: 1. d1 is an ordinary diode used to filter the noise from vcc and protect ic if vcc and gnd are plugged reversed. 2. c1=2.2 f typical, electrolytic capacitors are better. they should be fine tuned based on system design. 3. zd1 and zd2 breakdown voltage are 35v.
data sheet two phase dual-coil cmos smart fan motor driver ah9279 oct. 2011 rev. 1. 3 bcd semiconductor manuf acturing limited 11 mechanical dimensions TO-94 unit: mm(inch)
important notice bcd semiconductor manufacturing limited reserves the right to make changes without further not ice to any products or specifi- cations herein. bcd semiconductor manufacturing limited does not as sume any responsibility for us e of any its products for any particular purpose, nor does bcd semiconductor manufacturi ng limited assume any liability aris ing out of the application or use of any its products or circui ts. bcd semiconductor manufacturing limited does not convey any license under its patent rights or other rights nor the rights of others. - wafer fab shanghai sim-bcd semiconductor manufacturing co., ltd. 800 yi shan road, shanghai 200233, china tel: +86-21-6485 1491, fax: +86-21-5450 0008 main site regional sales office shenzhen office shanghai sim-bcd semiconductor manuf acturing co., ltd., shenzhen office unit a room 1203, skyworth bldg., gaoxin ave.1.s., nanshan district, shenzhen, china tel: +86-755-8826 7951 fax: +86-755-8826 7865 taiwan office bcd semiconductor (taiwan) company limited 4f, 298-1, rui guang road, nei-hu district, taipei, taiwan tel: +886-2-2656 2808 fax: +886-2-2656 2806 usa office bcd semiconductor corp. 30920 huntwood ave. hayward, ca 94544, usa tel : +1-510-324-2988 fax: +1-510-324-2788 - headquarters bcd semiconductor manufacturing limited no. 1600, zi xing road, shanghai zizhu sc ience-based industrial park, 200241, china tel: +86-21-24162266, fax: +86-21-24162277 bcd semiconductor manufacturing limited important notice bcd semiconductor manufacturing limited reserves the right to make changes without further not ice to any products or specifi- cations herein. bcd semiconductor manufacturing limited does not as sume any responsibility for us e of any its products for any particular purpose, nor does bcd semiconductor manufacturi ng limited assume any liability aris ing out of the application or use of any its products or circui ts. bcd semiconductor manufacturing limited does not convey any license under its patent rights or other rights nor the rights of others. - wafer fab shanghai sim-bcd semiconductor manufacturing limited 800, yi shan road, shanghai 200233, china tel: +86-21-6485 1491, fax: +86-21-5450 0008 bcd semiconductor manufacturing limited main site regional sales office shenzhen office shanghai sim-bcd semiconductor manuf acturing co., ltd. shenzhen office advanced analog circuits (shanghai) corporation shenzhen office room e, 5f, noble center, no.1006, 3rd fuzhong road, futian district, shenzhen 518026, china tel: +86-755-8826 7951 fax: +86-755-8826 7865 taiwan office bcd semiconductor (taiwan) company limited 4f, 298-1, rui guang road, nei-hu district, taipei, taiwan tel: +886-2-2656 2808 fax: +886-2-2656 2806 usa office bcd semiconductor corporation 30920 huntwood ave. hayward, ca 94544, u.s.a tel : +1-510-324-2988 fax: +1-510-324-2788 - ic design group advanced analog circuits (shanghai) corporation 8f, zone b, 900, yi shan road, shanghai 200233, china tel: +86-21-6495 9539, fax: +86-21-6485 9673 bcd semiconductor manufacturing limited http://www.bcdsemi.com bcd semiconductor manufacturing limited

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