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fd0251b fd0255b smart motor driver with embedded hall sensor this datasheet contains new product information. f eeling technology reserves the rights to modify the product specification without notice. no liability is assumed as a result of the use of t his product. no rights under any patent accompany t he sales of the product. rev1.9 dec. 18, 2008 p.1 feeling technology features motor driver with integrated hall sensor high current driving capability lock-shutdown protection & auto-restart function built-in fg(frequency generation) signal output s oft-switch phase-switching technique to reduce vib ration and acoustic noise thermal shutdown protection pwm speed control(only available for fd0255b) available in both t825(fd0251b) and t826(fd0255b) packages general description fd0251b/fd0255b is a single coil motor driver with embedded hall sensor. it integrates the motor drive r with the hall sensor, which simplifies the pcb(printed circu it board) design and make the fabrication of small- size motors possible. lock-shutdown and auto-restart function keeps the m otor from being over-heated and restarts the motor after being locked. fd0251b and fd0255b are built-in the signal output of rotation speed function, the system could detect the rotation speed of motor when using fd0251b and fd0255b. soft-switch phase-switching technique is used to reduce the vibration and acoustic noise. thermal-shutdown protection ensures the motor drive r to operate under specified temperature ranges. all the protection mechanisms mentioned above combi ne to provide a complete protecting scenario for th e motor system, keep the motor system from possible damages and guarantee correct operations. block diagram figure.1 halogen free bias generator coil driver oscillator hall plate reset power-on digital control logics chopper amplifier pwm control
fd0251b fd0255b rev1.9 dec. 18, 2008 p.2 feeling technology pin connection figure.2 pin descriptions legend: i=input, o=output, i/o=input/output, p=powe r supply, g=ground functional descriptions refer to the block diagram (figure.1), fd0251b/fd02 55b is composed of the following building blocks: bias generator the bias generator provides precise, temperature- a nd process-insensitive bias references for the anal og blocks. these references guarantee proper operation of the ic under all conditions specified in this specifica tion. oscillator the built-in oscillator provides the clock signal f or the digital control logics power-on reset used to detect the power-up ramp and reset the digi tal circuits to achieve correct operation as soon a s the power is ready. chopper amplifier to achieve a higher magnetic sensitivity the choppe r amplifier structure is adopted in this design. us e of this structure dynamically removes both the offset and f licker noise at the same time. digital control logics hall sensor part C generates controlling signals f or the hall sensor. coil driver part C generates controlling signals fo r the coil driver. tachometer (fg) signal output name i/o fd0251b fd0255b description fg o 1 1 frequency generation vss g 2 2 ground no o 3 3 driver output so o 4 4 driver output vdd p 5 5 positive power supply pwm i - 6 pulse width modulation speed control vdd so no vss fg b 1 2 3 4 5 b g pwm so no vss fg b 1 2 3 4 6 a g 5 vdd fd0251b fd0255b
fd0251b fd0255b rev1.9 dec. 18, 2008 p.3 feeling technology pwm control pwm(pulse-width modulation) is used for the speed c ontrol for fd0255b. 2 types of pwm input signals ca n be used : 1. voltage mode pwm : applying a constant(dc) voltage to the pwm pin and the fd0255b will generate pwm pulses internally wit h the on duty cycle ratio according to the diagram below(figure.3), which can be utilized by the user to control the speed of the motor. the rotation speed will be higher if the voltage applied to the pwm pin is hig her. figure.3 2. pulse mode pwm : user can also apply pwm pulses directly to the pwm pin. the fd0255b will pass this pulse to the coil d river with the original duty-cycle ratio. note: (1) this function is only available for fd0255b (2) while using pulse mode pwm, the high value of the input pulse should be higher than 0.5*vdd and the low value should be lower than 0.14*vdd (3) the lower-limit for the pwm pulse frequency is 200hz, and the recommended frequency range is highe r than 30khz where the pwm input pulses will not gene rate acoustic noise. note. the pwm pin contains an internal pull-up resisto r so the fd0255b will rotate at full-speed(100% on) when this pin is left un-connected(floating) . "on" ratio 0.14 vdd 0.5 vdd 0% 100%
fd0251b fd0255b rev1.9 dec. 18, 2008 p.4 feeling technology absolute maximum ratings parameter symbol conditions values unit min. typ. max. operating temperature t op - -20 105 storage temperature t st - -40 150 dc supply voltage(v dd , fg) v dd - 6.5 v pwm voltage range pwm high - >0.5v dd 6.5 v pwm low - 0 <0.14v dd v supply current i dd - 3 ma continuous current i cont - 500 ma hold current i hold - 800 ma fg, rd sink current i sink - 25 ma junction temperature t j - 170 maximum power dissipation p dt825 - 500 mw p dt826 - 520 mw thermal resistance (note1) ja t825 0.291 /mw t826 0.280 /mw thermal resistance (note1) jc t825 0.023 /mw t826 0.020 /mw magnetic flux density b unlimited gauss ir-reflow lead temperature - 10sec 260 note1: device mounted with copper area of approximately 10 mm 2, 1?z, no air flow. (room temperature: 25 ) figure.4 figure.5 figure.6 255 5 o c 10 1 sec 150 10 o c 90 30 sec 2~5 o c /sec 2~5 o c /sec second ir-reflow soldering condition room temp 0 25 50 75 100 125 150 326 412 500 pd (mw) temp. ( ) o c t825 power dissipation curve 175 240 154 68 0 105 o c 170 o c 0 25 50 75 100 125 150 339 428 520 pd (mw) temp. ( ) o c t826 power dissipation curve 175 250 160 71 0 105 o c 170 o c
fd0251b fd0255b rev1.9 dec. 18, 2008 p.5 feeling technology recommended operating conditions parameter conditions values unit min. typ. max. supply voltage - 1.8 5.5 v ambient temperature - -10 90 electrical characteristics v dd =5.0v, t a =25 (unless otherwise specified) parameter conditions values unit min. typ. max. average supply current(no load) 1.8 ma output saturation voltage(fg) iout= 10ma 0.5 v output leakage current(fg) vout=5v 1 a on resistance(rpmos+rnmos) 0.8 thermal shutdown threshold 165 magnetic characteristics parameter conditions values unit min. typ. max. operate points ( b op ) 25 g release points ( b rp ) -25 g hysteresis 50 g hysteresis characteristics figure.7 no so v brp bop b brp bop v b
fd0251b fd0255b rev1.9 dec. 18, 2008 p.6 feeling technology application circuit reference figure.8 note : must use c1 capacitor for the decoupling between v dd and v ss and place the capacitor as close to the ic as possible. 1. zd1: v dd over-voltage stress protection diode. 2. r2: current limit resistor for open drain fg out put. 3. r3: pwm pull-up resistor for open drain pwm sour ce signal. 4. r4: de-coupling resistor for long-distance signa l transmission . mlcc (0603) 2.2uf/6.3v vdd 4.7 ohm (0603) vdd so no vss fg bb 1 2 3 5 4 r1 c1 d1 schottky diode 0.2v zd1 6.5v l1 r2 100 ohm (0603) mlcc (0603) 2.2uf/6.3v vdd 4.7 ohm (0603) vdd so no vss fg ba 1 2 3 6 4 r1 c1 d1 schottky diode 0.2v zd1 6.5v l1 r2 100 ohm (0603) pwm 5 r4 r3 1k ohm (0603) fd0255b fd0251b g g option component
fd0251b fd0255b rev1.9 dec. 18, 2008 p.7 feeling technology output waveforms description: figure.9 fd025xb operation waveforms descriptions note : 1. fg is open drain, the high level of the signal depe nds on external supply voltage. 2. the on torque time of motor is same as the re-st art time.
fd0251b fd0255b rev1.9 dec. 18, 2008 p.8 feeling technology waveform: figure.10 normal operation waveforms (fd0251b / fd0 255b(full speed mode)) figure.11 soft-switching waveforms(fd0251b / fd0255 b(full speed mode)) ch1: no output ch2: so output ch3: fg output ch4: input current ch1: no output ch2: so output ch3: fg output ch4: input current
fd0251b fd0255b rev1.9 dec. 18, 2008 p.9 feeling technology figure.12 rotor lock and release waveforms (fd0251b / fd0255b(full speed mode)) ch1: no output ch2: so output ch3: fg output ch4: input current
fd0251b fd0255b rev1.9 dec. 18, 2008 p.10 feeling technology package dimension (unit:mm) t825 symbols dimension in millimeters min nom max a 1.05 1.20 1.35 a1 0.05 0.10 0.15 a2 1.00 1.10 1.20 b 0.25 - 0.50 c 0.08 - 0.20 d 2.80 2.90 3.10 e 2.90 3.10 3.30 e1 1.50 1.60 1.70 e 0.95bsc e1 1.90bsc l 0.50 0.65 0.80 l1 0.80bsc l2 0.25bsc 0? 5? 10? 1 3? 5? 7? 2 6? 8? 10? sensor location 0.86mm 1.02mm top view: marking side
fd0251b fd0255b rev1.9 dec. 18, 2008 p.11 feeling technology package dimension(unit:mm) t826 symbols dimension in millimeters min nom max a - - 1.45 a1 - - 0.15 a2 0.90 1.15 1.30 b 0.30 - 0.50 c 0.08 - 0.22 d 2.90bsc e 3.10bsc e1 1.60bsc e 0.95bsc e1 1.90bsc l 0.50 0.65 0.80 l1 0.80bsc l2 0.25bsc r 0.10 - - r1 0.10 - 0.25 0? 4? 8? 1 5? 10? 15? sensor location 0.86mm 1.02mm top view: marking side
fd0251b fd0255b rev1.9 dec. 18, 2008 p.12 feeling technology packing specification (tapping reel) t825,t826 packing quantity specification 4000ea / 1 reel 2 reels / 1 inside box 4 inside boxes / 1 outside box
fd0251b fd0255b rev1.9 dec. 18, 2008 p.13 feeling technology ic pin connection ic date code distinguish order information part number package tapping reel qtys marking fd0251bvr-g1 t825 4000ea / per reel bbxxxxg FD0255BVR-G1 t826 4000ea / per reel baxxxxg

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