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data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 1 general description the AM9789 is a single-phase, full wave motor driver suited for dc fan motor, and its speed is controlled by pwm input signal. it is suitable for both game machine and cpu cooler which need silent drivers. it features lock protection, thermal shutdown, pwm control, low noise and so on. the AM9789 is available in msop-8, msop-10 dfn-33-8 and dfn-33-10 packages. features ? btl output single-phase full-wave linear driver ? silent driver ? low supply current (normal operation less than 4ma) ? low standby current (pwm=0 duty) @ supply current less than 200 a ? speed controllable by pwm input signal ? built-in quick start function ? built-in lock protection and auto restart function ? built-in hall bias circuit ? built-in fg output ? built-in thermal shutdown circuit ? built-in over current protection circuit applications ? silent fan motors figure 1. package types of AM9789 msop-8 msop-10 dfn-33-8 dfn-33-10
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 2 pin configuration m8 package mm package (msop-8) (msop-10) 1 2 3 4 8 7 6 5 1 2 3 4 8 7 5 6 9 10 dn8 package dn package (dfn-33-8) (dfn-33-10) pin 1 mark 1 2 3 45 8 7 6 pin 1 mark 1 2 3 4 56 7 8 9 10 figure 2. pin configurat ion of AM9789 (top view) pin description pin number pin name function msop-10/ dfn-33-10 msop-8/ dfn-33-8 1 1 out2 output connection 2 2 nc no connected 3 3 hin+ hall input(+). connect to hall element positive output 4 hb hall bias 5 4 hin- hall input(-). connect to hall elem ent negative output 6 5 fg rotation speed output 7 6 pwm pwm signal input terminal 8 2 vcc power supply 9 7 out1 output connection 1 10 8 gnd ground
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 3 functional block diagram figure 3. functional block diagram of AM9789
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 4 ordering information AM9789 - circuit type package temperature range part nu mber marking id packing type msop-10 -40 to 105 c AM9789mmtr-g1 9789mm-g1 tape & reel msop-8 AM9789m8tr-g1 9789m8-g1 tape & reel dfn-33-8 AM9789dn8tr-g1 b6e tape & reel dfn-33-10 AM9789dntr-g1 bfd tape & reel bcd semiconductor's pb-free products, as designated with "g1" suffix in the part number, are rohs compliant and green. g1: green tr: tape & reel package m8: msop-8 mm: msop-10 dn8: dfn-33-8 dn: dfn-33-10
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 5 absolute maximum ratings (t a =25 c, note 1) parameter symbol value unit supply voltage v cc 10 v output current i out 1 a output voltage v out 10 v hb output current i hb 10 ma fg output voltage v fg 10 v fg output sink current i fg 10 ma operation temperature t op -40 to 125 c storage temperature range t stg -55 to 150 c lead temperature (soldering 10s) t lead 260 c thermal resistance (junction to ambient) ja msop-8 205 c/w msop-10 195 dfn-3x3-8 71 dfn-3x3-10 71 thermal resistance (j unction to case) jc msop-8 48 c/w msop-10 46 dfn-3x3-8 48 dfn-3x3-10 48 power dissipation p d msop-8 585 mw msop-10 585 dfn-3x3-8 1760 dfn-3x3-10 1760 esd (human body model) 4000 v esd (machine model) 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 op eration 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 (t a =25 c) parameter symbol min max unit supply voltage v cc 2 6 v hall input voltage range v hb 0.4 v cc -1.1 v operating ambient temperature t a -40 105 c
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 6 electrical characteristics v cc =5v, t a =25c, unless otherwise specified. parameter symbol conditi ons min typ max unit operation current i cc1 rotation mode 2 4 ma standby current i cc2 v pwm =0 130 200 a hb pin output voltage v hb i hb =5ma 1.1 1.3 1.5 v lock detection on time t on 0.3 0.4 0.5 s lock detection off time t off 3 4 5 s quick start enable time t qs 55 75 ms output drivers saturation voltage v sat(h+l) i out =250ma, upper and lower total 0.5 0.7 v input-output gain g io v out /(v hin+ -v hin- ) 44 47 50 db fg pin low voltage v fg i fg =5ma 0.2 0.3 v fg pin leakage current i fgl v fg =5v 0.1 1 a pwm input high level voltage v pwmh 0.5v cc v cc v pwm input low level voltage v pwml 0 0.2v cc v pwm input frequency f pwm 0.02 50 khz hall input offset voltage v hofs 10 mv hall input hysteresis voltage v hys 5 10 15 mv thermal protection temperature t sd 165 c thermal hysteresis width t sd 30 c
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 7 typical performance characteristics figure 4. supply current vs. supply voltage (v pwm =v cc ) figure 5. supply current vs. supply voltage (v pwm =0v) figure 6. saturation voltage vs. output current figure 7. power dissipation vs. temperature (msop) 0123456 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 supply current (ma) supply voltage (v) operation mode v pwm =v cc 0123456 0 50 100 150 200 supply current ( a) supply voltage (v) standby mode v pwm =0v 0 100 200 300 400 500 0 200 400 600 800 saturation voltage (mv) output current (ma) v sat-h v sat-l -40 -20 0 20 40 60 80 100 120 140 0 100 200 300 400 500 600 700 800 power dissipation (mw) ambient temperature ( o c) package: msop-10/msop-8
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 8 typical performance characteristics (continued) figure 8. power dissipation vs. temperature (dfn) -40 -20 0 20 40 60 80 100 120 140 0 500 1000 1500 2000 power dissipation (mw) ambient temperature ( o c) package: dfn-3x3-10/dfn-3x3-8
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 9 truth table input output mode hin- hin+ pwm out1 out2 fg l h h h l l operation mode h l l h off h l l l l off l h l l l l h - l l off lock mode h l l l off - - l off off off standby mode
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 10 typical application for msop-10 package
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 11 typical application (continued) for msop-8 package figure 9. typical applications of AM9789 (note 2) note 2: d1 is an ordinary diode used to filter the noise from vcc and protect ic if vcc and gnd are plugged reversed. c1=1 f/10v typical. r1 and r2 should be fine tuned based on system design. they can be removed according to the system requirements. zener diode (d2) is an optional choice. r fg =10k ? typical.
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 12 application information 1. reverse connection of power supply connector reverse connection of power supply connector may break ic. some methods such as inserting a diode between power supply and vcc terminal can be taken to avoid the reverse connection destruction. 2. power supply line back electromotive force (emf) causes regenerated current to the power supply line, so insert a capacitor (recommended value: 1 f or larger) as close as possible to the space between the power supply pin (vcc pin) and ground pin (gnd pin) for routing regenerated current. 3. gnd potential and external components ensure that the potential of gnd terminal is the minimum potential in any operating condition. external components connected to the ground must be connected with lines that are as short as possible and external components connected between ic pins must be placed as close to the pins as possible. 4. mounting failures in the process of attaching ic to the printed board, more attention must be paid to the direction and location of the ic, since mounting failures may also break ic. in addition, destruction is also possible when the circuit is shorted by foreign substance between outputs or between output and power supply or between output and gnd. 5. thermal consideration refer to figure 7 ?power dissipation vs. ambient temperature (msop- 10/msop-8)?, the ic is safe to operate below the curve and the thermal protection will be caused if the operating area is above the line. for example, when t a =75 c, the maximum power dissipation is about 0.35w. the power dissipation can be calculated by the following equation: p d =v sat(h+l) i out +v cc i cc for example, v cc =5v, i cc =2ma, i out =250ma, v sat(h+l) =0.5v, then p d =0.135w. the gnd pin provides an el ectrical connection to the ground and channeling heat away. the printed circuit board (pcb) forms a heat sink and dissipates most of the heat to the ambient air. 6. thermal shutdown circuit considering the power dissipation under actual operating condition, the thermal design must be applied with sufficient margin. AM9789 features thermal shutdown (tsd) circuit (operation temperature is 165 c typical and hysteresis width is 30 c typical). when the chip temperature reaches the tsd circuit temperature, the output terminal becomes an op en state. tsd circuit is designed simply for the purpose of intercepting ic from overheating. make sure that the ic should not be used again after this circuit operating. figure 10 shows a fan rotates normally first and then enters into otp mode since the chip temperature reaches 165 c. finally the chip temperature decreases below 135 c, then otp mode is canceled and the fan rotates normally again. figure 10. otp function 7. over current protection the driver current is detected by AM9789 internal circuit. when the output current is over 1a or larger, AM9789 will close the output driver. after that if the output current decreases, AM9789 will enable the fan to rotate again. figure 11 shows the detailed process. figure 11. ocp function 8. pwm mode the output transistor is on when a high-level voltage is input to the pwm pin, and is off when a low-level voltage is input. pwm controls the speed of the motor by inputting the pulse in accordance with the duty cycle to the pwm pi n. when the motor is v out1 5v/div v out2 5 v /d i v v fg 5v/div time 1s/div v out1 5v/div v out2 5v/div v fg 5v/div time 1s/div
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 13 application information (continued) operated with the pwm pin open, the built-in resistor enables the pwm pin to change to high-level voltage and the motor speed rises to full speed. when the pwm pin is fixed at low-level voltage, the motor decelerates, and after the motor stops, it enters ?power saving mode?. figure 12 shows a rotating fan?s waveform at pwm mode. figure 13 shows lock mode waveform at pwm input condition in the same fan. figure 12. pwm mode waveform ( pwm: 50% duty cycle, v h =5v, v l =0v) figure 13. lock mode at pwm input condition ( pwm: 50% duty cycle, v h =5v, v l =0v) 9. frequency generator function the fg pin is an open collector output, connecting a pull-up resistor to a high level voltage for the frequency generator function. during the lock mode, fg pin output will be always high. open the terminal when not in use. figure 14 shows how this function works. figure 14. rotation mode waveform 10. lock protection and auto-restart the ic detects the rotation of the motor by hall signal and the lock detection on time (t on ) and off time (t off ) are adjusted by the internal counter. as showed below. figure 15. lock mode waveform 11. quick start and standby mode the ic will enter standby mode when pwm input keeps low level for more than 55ms (typ.). in standby mode, shutdown amplifier and fg will be shutdown, and the supply current is around 130 a. in standby mode, the lock protection function doesn?t work; the fan will restart when released from standby mode. figure 16 describes this function. figure 16. quick start and standby mode time 2s/div v out1 5v/div v out2 5v/div v fg 5v/div i in 200ma/div v out2 2v/div v fg 2v/div i in 200ma/div v out1 2v/div v out2 2v/div v fg 2v/div i in 200ma/div time 2ms/div time 2s/div time 10ms/di v v out1 5v/div v out2 5v/div v fg 5v/div i in 200ma/div v out1 2v/div
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 14 mechanical dimensions msop-10 unit: mm(inch) 0.400(0.016) 0.800(0.031) 3 . 1 0 0 ( 0 . 1 2 2 ) 2 . 9 0 0 ( 0 . 1 1 4 ) 0 . 8 2 0 ( 0 . 0 3 2 ) 1 . 1 0 0 ( 0 . 0 4 3 ) 0 6 0 . 0 9 0 ( 0 . 0 0 4 ) 0 . 2 3 0 ( 0 . 0 0 9 ) 0 . 7 5 0 ( 0 . 0 3 0 ) 0 . 9 5 0 ( 0 . 0 3 7 ) 4 . 7 5 0 ( 0 . 1 8 7 ) 5 . 0 5 0 ( 0 . 1 9 9 ) 0.280(0.011) 0.180(0.007) 0.500(0.020) typ 3.100(0.122) 2.900(0.114) 0 . 0 2 0 ( 0 . 0 0 1 ) 0 . 1 5 0 ( 0 . 0 0 6 ) note: eject hole, oriented hole and mold mark is optional.
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 15 mechanical dimensions (continued) msop -8 unit: mm(inch) 4.700(0.185) 0.650(0.026)typ 5.100(0.201) 0.410(0.016) 0.650(0.026) 0 . 0 0 0 ( 0 . 0 0 0 ) 0 . 2 0 0 ( 0 . 0 0 8 ) 0.300(0.012)typ 3 . 1 0 0 ( 0 . 1 2 2 ) 2 . 9 0 0 ( 0 . 1 1 4 ) 0 . 8 0 0 ( 0 . 0 3 1 ) 1 . 2 0 0 ( 0 . 0 4 7 ) 3.100(0.122) 2.900(0.114) 0 6 0 . 1 5 0 ( 0 . 0 0 6 ) t y p 0 . 7 6 0 ( 0 . 0 3 0 ) 0 . 9 7 0 ( 0 . 0 3 8 ) ` note: eject hole, oriented hole and mold mark is optional.
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 16 mechanical dimensions (continued) dfn-33-8 unit: mm(inch) 2.900(0. 114) 3.100(0. 122) 2.900(0. 114) 3.100(0. 122) 2. 200 (0. 087) 2. 400( 0. 094) 1. 400(0.055) 1.600(0.063) n8 n5 n4 n1 0.375(0. 015) 0.575(0. 023) 0.180(0. 007) 0.300(0. 012) 0.153(0. 006) 0.253(0. 010) 0.000(0. 000) 0.050(0. 002) 0.700(0. 028) 0.800(0. 031) pin #1 identification see detail a b s c 0 . 6 5 0 ( 0 . 0 2 6 ) pin 1 mark 1 2 detail a 1 2 1 2 pin 1 options
data sheet single phase full-wave motor driver for silent fan motor AM9789 oct. 2012 rev. 1. 1 bcd semiconductor manufacturing limited 17 mechanical dimensions (continued) dfn-33-10 unit: mm(inch) 2.900(0. 114) 3.100(0.122) 2.900(0. 114) 3.100(0. 122) 1.600(0. 063) 1.800(0. 071) 0.200(0. 008) 0.300(0. 012) 0.500(0. 020) typ 0.300(0. 012) 0.500(0. 020) 0.000(0. 000) 0.050(0. 002) 0.700(0. 028) 0.800(0. 031) 0.153(0. 006) 0.253(0. 010) 2.300(0. 090) 2.500(0. 098) n1 n5 n6 n10 pin 1 mark pin # 1 identification see detail a 1 2 detail a 1 2 1 2 pin 1 options
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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