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data sheet two phase hall effect latch with locked protection ah287 oct. 2009 rev. 1. 3 bcd semiconductor manufacturing limited 1 general description the ah287 is an integrated hall sensor with output drivers for brushless dc motor application. this ic consists of two complementary outputs for motor?s coil driving and has automatic lock protection and auto- restart function relatively. to avoid coil burning, rotor lock shutdown protection circuit shut down the output driver if the rotor blocked and then the automatic recovery circuit will try to restart the motor. this function repeats while rotor is blocked. until the blocking is removed, the motor recovers running normally. in addition, the au to-restart time is flexible by adjusting the capacitance (c ct ). placing the device in a variable magnetic field, if the magnetic flux density is larger than threshold b op , the do is turned to sink and dob is turned to drive. this output state is held until a magnetic flux density reversal falls below b rp , causing do to be turned to drive and dob turned to sink. this ic is available in to-94 package. features ? on-chip hall sensor ? operating voltage: 3.5v to 18v ? maximum output current: 350ma (ave) ? rotor-locked protection ? automatic restart ? adjustable auto-restart time ? internal band-gap re gulator for temperature compensation ? operating temperature: -20 ? c to 85 ? c ? low profile to-94 package ? esd rating: 300v (machine model) application ? dual-coil brushless dc fan figure 1. package type of ah287 to-94
data sheet two phase hall effect latch with locked protection ah287 oct. 2009 rev. 1. 3 bcd semiconductor manufacturing limited 2 gnd dob do ct 1 2 3 4 pin configuration z4 package (to-94) figure 2. pin configuratio n of ah287 (front view) pin description pin number pin name function 1 ct timing capacitance 2 do output 1 3 dob output 2 4 gnd ground
data sheet two phase hall effect latch with locked protection ah287 oct. 2009 rev. 1. 3 bcd semiconductor manufacturing limited 3 functional block diagram figure 3. functional block diagram of ah287 ordering information ah287 - circuit type package z4: to-94 part number marking id package temperature range lead free green lead free green packing type AH287Z4-AE1 ah287z4-ag1 ah287z4-e1 ah287z4-g1 bulk ah287z4-be1 ah287z4-bg1 ah287z4-e1 ah287z4-g1 bulk to-94 -20 to 85 c ah287z4-ce1 ah287z4-cg1 ah287z4-e1 ah287z4-g1 bulk bcd semiconductor's pb-free products, as designated with "e1" suffix in the part number, are rohs compliant. products with "g1" suffix are available in green package. regulator hall sensor amplifier schmitt trigger output driver dob gnd 3 4 lock protection and auto restart 1 ct temperature compensation do 2 magnetic characteristics a: 10 to 50 gauss b: 5 to 70 gauss c: 100 gauss e1: lead free g1: green
data sheet two phase hall effect latch with locked protection ah287 oct. 2009 rev. 1. 3 bcd semiconductor manufacturing limited 4 absolute maximum ratings (note 1, t a =25 c) parameter symbol value unit supply voltage v cc 20 v magnetic flux density b unlimited gauss continuous 350 ma hold 550 ma output current peak (start up) i out 750 ma power dissipation p d 550 mw die to atmosphere ja 227 c/w thermal resistance die to package case jc 49 c/w junction temperature t j 150 c storage temperature t stg -50 to 150 c esd (machine model) 300 v esd (human body model) 3000 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 (note 2) parameter symbol min max unit supply voltage* v cc 3.5 18 v lock protection and automatic restart voltage** v lock 4.5 18 v ambient temperature t a -20 85 c note 2: when d1 (see figure 12) is disconnected, * the minimum startup voltage is 3.5v. ** the minimum operation voltage of lock protection and automatic restart is 4.5v.
data sheet two phase hall effect latch with locked protection ah287 oct. 2009 rev. 1. 3 bcd semiconductor manufacturing limited 5 electrical characteristics v cc =14v, t a =25c, unless otherwise specified. parameter symbol conditions min typ max unit b>150 gauss, v cc =5v, v dob =v cc , i do =100ma (or b -150 gauss, v cc =5v, v do = v cc , i dob =100ma) 1 1.15 v output saturation voltage v sat b>150 gauss, v dob = v cc , i do =350ma (or b -150 gauss, v do = v cc , i dob =350ma) 1.2 1.35 v supply current i cc b>150 gauss, v dob =v cc (or b -150 gauss, v do =v cc ) 5 6.5 ma output rise time tr r l =820 ? , c l =20p f 3 10 s output fall time tf r l =820 ? , c l =20pf 0.3 1.5 s switch time differential ? t r l =820 ? , c l =20pf 3 10 s output zener breakdown voltage v z 55 v charge current i chg v ct =1 to 2.5v 5 a discharge current i dhg v ct =3.5 to 2.5v 0.5 a clamp voltage v cl limiting voltage 3.2 v comparator voltage v cp limiting voltage 2.2 v
data sheet two phase hall effect latch with locked protection ah287 oct. 2009 rev. 1. 3 bcd semiconductor manufacturing limited 6 magnetic characteristics (t a =25 c) parameter symbol grade min typ max unit a 10 50 b 5 70 operating point b op c 100 gauss a -50 -10 b -70 -5 releasing point b rp c -100 gauss hysteresis b hys 70 gauss test circuit n s marking side do dob gnd c ct ct (front view) 1 2 3 4 ah287 820 ? r l 2.2 f 820 ? r l power input c l 20pf c l 20pf
data sheet two phase hall effect latch with locked protection ah287 oct. 2009 rev. 1. 3 bcd semiconductor manufacturing limited 7 magnetic hysteresis characteristics figure 4. do output vs. magnetism figure 5. dob output vs. magnetism typical performance characteristics figure 6. supply current vs. supply voltage figure 7. supply curr ent vs. ambient temperature -100 -50 0 50 100 0 2 4 6 8 10 12 14 dob output (v) magnetism (gauss) -100 -50 0 50 100 0 2 4 6 8 10 12 14 do output (v) magnetism (gauss) 2468101214161820 0 1 2 3 4 5 6 supply current (ma) supply voltage (v) t a =25 o c -20 0 20 40 60 80 0 2 4 6 8 10 supply current (ma) ambient temperature ( o c) v cc =14v
data sheet two phase hall effect latch with locked protection ah287 oct. 2009 rev. 1. 3 bcd semiconductor manufacturing limited 8 typical performance characteristics (continued) figure 8. b op /b rp /b hys vs. supply voltage figure 9. b op /b rp /b hys vs. ambient temperature figure 10. saturation voltage vs. ambient temperature figure 11. power dissipation vs. ambient temperature ( table 1) table 1: t a ( ) -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 p d (mw) 551 551 551 551 551 551 551 551 551 551 529 507 485 463 441 419 396 374 t a ( ) 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 145 150 p d (mw) 352 330 308 286 264 242 220 198 176 154 132 110 88 66 44 22 0 4 6 8 10 12 14 16 18 -200 -150 -100 -50 0 50 100 150 200 b op /b rp /b hys (gauss) supply voltage (v) b op b rp b hys -20 0 20 40 60 80 -20 0 20 40 60 80 b op /b rp /b hys (gauss) ambient temperature ( o c) b op b rp b hys -20 0 20 40 60 80 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 saturation voltage (v) ambient temperature ( o c) v cc =14v i out =350ma -25 0 25 50 75 100 125 150 0 200 400 600 800 power dissipation (mw) ambient temperature ( o c)
data sheet two phase hall effect latch with locked protection ah287 oct. 2009 rev. 1. 3 bcd semiconductor manufacturing limited 9 typical application (note 3) note 3: 1. due to the special internal circuit of ah287, the minimum operation voltage of lock protection and automatic restart is higher than the minimum startup voltage. it is 4.5v. 2. the capacitances of c ct and c2 are adjustable base on system requirements. the recommended values are as below: c ct c2 1 f/9v~2.2 f/9v 1 f/50v~2.2 f/50v figure 12. typical application of ah287
data sheet two phase hall effect latch with locked protection ah287 oct. 2009 rev. 1. 3 bcd semiconductor manufacturing limited 10 operating diagram (note 4) note 4: the automatic restart circuit detects a motor lock condition and automatically turns off the output current. when the lock is cleared, the ic automa tically restarts and allows the motor to run. in ah287, automatic restart is performed in the following manner. a motor lock condition is detected when the hall signal stops switching. the output is on when ct pin is being charged, and off when ct pin is being discharged. ) ( ) ( * sec i v v c t chg cp cl on ? = ) ( ) ( * sec i v v c t dhg cp cl off ? = output on time (t on ) and off time (t off ) are determined by c, the cap acitance of the ct pin external capacitor. v cl is the ct pin clamp voltage v cp is the ct pin comparator voltage i chg is the ct pin charge current i dhg is the ct pin discharge current figure 13. control timing diagram of ah287 reverts to normal operation motor lock cleared on off motor locked motor lock detected t on t off hall input motor output ct ct clamp voltage ct comparator voltage
data sheet two phase hall effect latch with locked protection ah287 oct. 2009 rev. 1. 3 bcd semiconductor manufacturing 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 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 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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