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data sheet three phase direct pwm sensorless motor driver am9800 sep. 2012 rev. 1. 0 bcd semiconductor manufacturing limited 1 general description the am9800 is a direct pwm driver ic designed for three-phase brushless motors. also, by using highly silent pwm drive, switchi ng current of the phase with a smooth slope reduces the sound of slewing motor, and makes high-efficiency drive a reality by a synchronous commutation. the device is build-in lock protection. when the fan is locked, the device will enter the lockup protection mode. it is also equipped with thermal shutdown function and forward or reverse rotation selection. in normal operation, supply current is less than 2ma, but in pwm=0 mode it is just around 20 a. the am9800 is available in ssop-16 package. features ? speed controllable by pwm input signal ? sensorless drive ? soft switched drive ? build-in forward/reverse switching circuit ? power saving function in a stopped state: 2ma and pwm=0 state: 20 a ? build-in current limiter circuit ? build-in lock protection and auto-restart ? built-in over current protection ? built-in thermal shutdown circuit ? esd rating: 4000v (human body model) 300v (machine model) applications ? cpu cooler fan in notebook personal computers figure 1. package type of am9800 ssop-16
data sheet three phase direct pwm sensorless motor driver am9800 sep. 2012 rev. 1. 0 bcd semiconductor manufacturing limited 2 pin configuration gs package (ssop-16) 2 3 4 5 6 7 8 15 14 13 12 11 10 9 16 1 figure 2. pin configuration of am9800 (top view) pin description pin number pin name function 1 vo output pin (v), connected to the motor coil 2 uo output pin (u), connected to the motor coil 3 vcc supply voltage 4 com motor middle-point connection 5 comin motor position detection comparator filter pin 1 6 fil motor position detection comparator filter pin 2 7 osc osc startup frequency setting 8 sgnd ground for ic 9 f/r rotation direction switching 10 fg fg pulse output 11 pwm pwm signal input 12 vg charge pump step-up output 13 cp charge pump step-up pulse output pin 14 cpc charge pump step-up pin 15 rf output current detection 16 wo output pin (w), connected to the motor coil
data sheet three phase direct pwm sensorless motor driver am9800 sep. 2012 rev. 1. 0 bcd semiconductor manufacturing limited 3 functional block diagram figure 3. functional block diagram of am9800
data sheet three phase direct pwm sensorless motor driver am9800 sep. 2012 rev. 1. 0 bcd semiconductor manufacturing limited 4 ordering information am9800 - circuit type package temperature range part nu mber marking id packing type AM9800GS-G1 AM9800GS-G1 tube ssop-16 -30 to 95 c am9800gstr-g1 AM9800GS-G1 tape & reel bcd semiconductor's pb-free products, as designated with "g1" suffix in the part number, are rohs compliant and green. absolute maximum ratings (t a =25 c, note 1) parameter symbol value unit supply voltage v cc 6.5 v pre-drive voltage (gate voltage) v g 10 v output current i out 0.7 a pwm input withstand voltage v pwm v cc v fg output withstand voltage v fg 6 v fg output current i fg 5 ma power dissipation1 (independent ic) p d1 0.3 w power dissipation2 (note 2) p d2 0.8 w ambient temperature (note 3) t a -40 to 105 c storage temperature t stg -55 to 150 c esd (human body model) 4000 v esd (machine model) 300 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. note 2: when mounted on 76.1mm114.3mm1.6mm glass epoxy board. note 3: t j =150 c. use the ic in the range where the te mperature of the chip does not exceed t j =150 c during operation. g1: green tr: tape & reel blank: tube package gs: ssop-16
data sheet three phase direct pwm sensorless motor driver am9800 sep. 2012 rev. 1. 0 bcd semiconductor manufacturing limited 5 recommended operating conditions (t a =25 c) parameter symbol min max unit supply voltage v cc 2.2 6 v operating temperature t op -30 95 c electrical characteristics v cc =5v, t a =25c, unless otherwise specified. parameter symbol conditions min typ max unit supply current 1 i cc1 v pwm =v cc 2 2.5 ma supply current 2 i cc2 v pwm =0v 20 50 a vg output voltage v g 9.7 v upper transistor resistance r onh i out =0.5a 1 1.5 ? lower transistor resistance r onl i out =0.5a 1 1.5 ? upper & lower transistor resistance total r on(h+l) i out =0.5a 2 3 ? osc frequency f osc c osc =2200pf 1.0 khz pwm pin high-level input voltage v pwmh v cc 0.8 v cc v pwm pin low-level input voltage v pwml 0 v cc 0.2 v pwm pin input current i pwm v pwm =0v -50 -20 a pwm input frequency f pwm 20 25 50 khz fg low level voltage v fg i fg =0.5ma 0.2 v rf limiter voltage v rf r f =0.5 ? 0.225 0.25 0.275 v lock detection on time t on 2 s lock detection off time t off 4 s thermal protection temperature t sd 175 c temperature hysteresis width ? t sd 25 c
data sheet three phase direct pwm sensorless motor driver am9800 sep. 2012 rev. 1. 0 bcd semiconductor manufacturing limited 6 typical performance characteristics figure 4. supply current vs. supply voltage figure 5. supply current vs. supply voltage figure 6. saturation voltage vs. output current figure 7. power dissipation vs. temperature (note 2) -40-20 0 20406080100 0 200 400 600 800 1000 power dissipation (mw) ambient temperature ( o c ) 0123456 0.0 0.5 1.0 1.5 2.0 2.5 t a =25 o c v pwm =v cc supply current (ma) supply voltage (v) 0123456 0 5 10 15 20 25 t a =25 o c v pwm =0v supply current ( a) supply voltage (v) 0 100 200 300 400 500 600 0 100 200 300 400 500 600 700 v cc =5v, t a =25 o c saturation voltage (mv) output current (ma) v sat-up v sat-down
data sheet three phase direct pwm sensorless motor driver am9800 sep. 2012 rev. 1. 0 bcd semiconductor manufacturing limited 7 typical application 1 f 1000pf 2200pf pwm pwm control signal f=20k to 50khz 0.1 0.1 f 0.5 vo uo vcc com comin fil osc sgnd wo rf cpc cp vg pwm fg f/r r f f r fg 10k v fg fg output 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 figure 8. typical application of am9800
data sheet three phase direct pwm sensorless motor driver am9800 sep. 2012 rev. 1. 0 bcd semiconductor manufacturing limited 8 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 (sgnd 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 shutdown circuit considering the power dissipation under actual operating condition, the thermal design must be applied with sufficient margin. am9800 features thermal shutdown (tsd) circuit (protection temperature is 175 c typical and hysteresis width is 25 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 9 shows a fan rotates normally first and then enter into otp mode since the chip temperature reaches 175 c. finally the chip temperature decreases below 150 c, then otp mode is canceled and the fan rotates normally again. figure 9. otp function 6. f/r function a high level input causes the current to flow into the motor in the order of u, v, and w and a low level input in the order of u, w, and v. when the motor is used with the f/r pin open, the built-in resistor enables the f/r pin to gnd. changing the order of current application turns the motor to rotate in the opposite direction. switching h/l of f/r (pin 9) terminal should not be done during the motor rotation. it should be done once the motor stops. f/r terminal should be connected to vcc or gnd for reducing pwm noise. figure 10 shows a rotating fan?s waveform at forward mode (f/r pin is connected to sgnd pin). figure 10. rotation mode waveform (forward mode) 7. pwm mode the output transistor is on when a high-level voltage is input to the pwm pin (pin 11), 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 pin. when the motor is 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 11 shows a rotating fan?s waveform at pwm mode. v uo 5v/div v vo 5v/div v wo 5v/div i wo 100ma/div time 1s/di v v uo 5v/div v vo 5v/div v wo 5v/div i wo 200ma/div time 1ms/di v
data sheet three phase direct pwm sensorless motor driver am9800 sep. 2012 rev. 1. 0 bcd semiconductor manufacturing limited 9 application information (continued) figure 11. rotation mode waveform (pwm mode) (f=25khz, v h =5v, v l =0v, duty cycle=50%) 8. soft switching circuit am9800 adopts variable duty soft switching to minimize the motor drive no ise. figure 12 shows how soft switching circuit works during the fan rotation. figure 12. soft switching waveform 9. current limiter circuit the driver current is detected by connecting a resistor between rf pin (pin 15) and ground. the current limiter circuit limits the output current peak value to a level determined by the equation i=v rf /r f (v rf =0.25v typical). 10. osc circuit a capacitor must be connect ed between osc pin (pin 7) and ground. when a capacitor is connected, the osc pin starts self-oscillation, and its frequency becomes the startup frequency. figure 13 shows a fan system?s osc waveform. figure 13. osc waveform (c osc =2200pf) 11 position detector comparator circuit for rotor the position detector compar ator circuit for the rotor is a comparator for detecting rotor positional information with the back emf signal generated when the motor rotates. the ic determines the timing at which the output block applies current to the motor based on the position information obtained here. a capacitor (between 1000 and 10000pf) must be connected between comin pi n (pin 5) and the fil pin (pin 6) to prevent any motor startup misoperation that is caused by the co mparator input noise. 12 fg output circuit fg output pin (pin 10) provides a pulse signal equivalent to what provided by systems using a hall-effect sensor. a pull-up resistor (10k ? is recommended) must be connected between fg pin and the power supply. figure 14 shows the fg output signal when the fan rotates. figure 14. fg output signal 13. lock shutdown and auto restart this ic detects the rotation of the motor by internal circuit block, and adjusts lock detection on time (t on ) and lock detection off time (t off ) by internal counter. t on and t off are shown as below: figure 15. lock mode v uo 5v/div v vo 5v/div v wo 5v/div -i wo 100ma/div time 5ms/di v v uo 5v/div v vo 5v/div v wo 5v/div -i wo 200ma/div time 200
data sheet three phase direct pwm sensorless motor driver am9800 sep. 2012 rev. 1. 0 bcd semiconductor manufacturing limited 10 mechanical dimensions ssop-16 unit: mm(inch) 3.800(0.150) 4.000(0.157) 0.200(0.008) 0.300(0.012) 0.800(0.031) 0.635(0.025) bsc 0.900(0.035) 1.000(0.039) 0.100(0.004) 0.250(0.010) 1.350(0.053) 1.750(0.069) 0.400(0.016) 1.270(0.050) 4.700(0.185) 5.100(0.201) 5.800(0.228) 6.200(0.244) 0.650(0.026) 0.750(0.030) 0.200(0.008) 0.250(0.010) 1.350(0.053) 1.550(0.061) 0.020(0.001) 0.050(0.002) r0.150(0.006) r0.150(0.006) 0.250(0.010) see detail a 7 7 8 8 0.150(0.006) 0.250(0.010) 0 8 detail a note: eject hole, oriented hole and mold mark is optional.
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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