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BD6670FM motor driver ics 1/17 3phase spindle motor driver for cd-rw BD6670FM BD6670FM is a 3-phase spindle motor driver adopting 180 pwm direct driving system. noise occurred from the motor driver when the disc is driver can be reduced. low power consumption and low heat operation are achieved by using dmos fet in output and driving directly. ! ! ! ! applications cd-rw ! ! ! ! features 1) 180 degree direct-pwm driving system. 2) built in power save circuit. 3) built in current limit circuit. 4) built in fg-output. 5) built in 3phase synthesized fg-output. 6) built in hall bias circuit. 7) built in reverse protection circuit. 8) built in short brake circuit. 9) low consumption by mos-fet. 10) built in capacitor for oscillator. 11) built in gain switch and current limit switch. ! ! ! ! absolute maximum ratings (ta=25 c) power supply voltage supply voltage for motor v g pin voltage operating temperature range junction temperature power dissipation output current storage temperature range debating in done at 17.6mw / c for operating above ta=25 c. the current is guaranteed 3.0a in case of the current is turn on / off in a duty-ratio of less than 1/10 with a maximum on-time of 5msec. ? 2 70mm 70mm 1.6mm glass epoxy board. ? 1 however, do not exceed pd, aso and tj=150 c. parameter symbol limits unit v cc t jmax 7v v v m 15 20 v v g i omax topr 2500 mw c c 150 c pd tstg 2200 ? 20~ + 75 ? 55~ + 150 ma ? 1 ? 2 ! ! ! ! recommended operating conditions supply voltage for motor v g pin voltage power supply voltage parameter v cc 4.5 5.5 ? v m 4.0 13.2 v v v ? v g 8.5 19 ? symbol min. typ. max. unit
BD6670FM motor driver ics 2/17 ! ! ! ! block diagram + ? torque amp current sense reverse detect + ? driver matrix ps cl h1 + h2 + h1 ? h2 ? h3 + h3 ? cp1 cp2 v g c nf sb v cc gsw gnd fg3 v h fg v m v m a1 r nf 1 r nf 1 a3 r nf 2 ps ec ecr a 2 gain control charge pump hall bias matrix fig.1 dq ck qb + ? + ? + ? + ? + ? + ? + ? + ? + ? exor pwm comp hall comp 1 2 3 4 5 6 7 8 9 10 11 12 13 14 19 18 17 16 15 26 25 28 27 21 20 24 23 22 hall amp tsd osc u-pre driver l-pre driver
BD6670FM motor driver ics 3/17 ! ! ! ! pin descriptions capacitor connection pin for charge pump output 3 for motor power supply for signal division capacitor connection pin for phase compensation short brake pin capacitor pin 2 for charge pump hall input amp 1 positive input resistor connection pin for current sense output 2 for motor resistor connection pin for current sense output 1 for motor resistor connection pin for current sense power supply for driver gnd capacitor pin 1 for charge pump hall input amp 1 negative input gain switch pin hall input amp 3 negative input hall input amp 3 positive input hall input amp 2 positive input hall input amp 2 negative input torque control standard voltage input terminal power supply for driver torque control voltage input terminal power save pin hall bias pin fg output pin fg3 output pin h 2 + sb h 3 ? h 2 ? h 3 + h 1 ? cp2 v g r nf2 r nf1 r nf1 v cc a 3 a 2 a 1 v m v m fg fg3 ecr ec cp1 ps cnf v h h 1 + pin no. function pin name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 gnd gsw
BD6670FM motor driver ics 4/17 ! ! ! ! input output circuits output pins a 1 : pin24, a 2 : pin22, a 3 : pin20 hall bias pin26 cnf pin12 torque amplifier ecr : pin16, ec : pin17 short brake pin13 fg / fg3 output fg : pin27, fg3 : pin28 rnf2 pin19 power save pin18 cp1 output pin9 cp2 / v g output cp2 : pin10, v g : pin11 hall input h1 + : pin1, h1 ? : pin2, h2 + : pin3, h2 ? : pin4, h3 + : pin5, h3 ? : pin6 gain switch pin7 a 2 a 1 v m r nf 1 a 3 v cc v h (pin26) 100k cp1 (pin9) v cc 50 v cc v m v g (pin11) cp2 (pin10) 2k 2k cnf (pin12) v cc 50 20k sb (pin13) v cc 30k 20k ps (pin18) v cc 30k fg3 (pin28) fg (pin27) v cc 50 v cc 355 rnf2 (pin19) v cc 1k ecr (pin16) ec (pin17) v cc 1k v cc hn + 1k 5k 1k 1k 1k v cc hn ? v cc v cc gain switch (pin7) 1k 75k 100k 10k 10k 25k
BD6670FM motor driver ics 5/17 ! ! ! ! electrical characteristics (unless otherwise noted, ta=25 c, v cc =5v, v m =12v) parameter conditions fig.2 fig.2 fig.2 fig.2 fig.2 fig.3 fig.3 fig.3 fig.3 fig.4 fig.4 fig.4 fig.6 fig.6 fig.6 fig.6 fig.7 fig.7 fig.7 fig.4 fig.4 fig.5 fig.5 fig.10 fig.10 fig.11 fig.11 fig.9 fig.4 test circuit i hb = 10ma e c = e cr = 1.65v gsl = l , r nf = 0.5 ? gsl = m , r nf = 0.5 ? gsl = h , r nf = 0.5 ? gsw = l , r nf = 0.5 ? gsw = m , r nf = 0.5 ? gsw = h , r nf = 0.5 ? stand by mode stand by mode oneside input level linear range : 0.5v 3.0v i fg =? 100 a v cc = 5v, v m = 12v, cp1 = cp2 = 0.1 f i o = 600ma (upper + lower) fig.8 symbol i cc 1 i cc 2 v pson v psoff v hb v har v inh v hys + v gswl v gswh v gswop v hys ? e c , e cr ecofs + ecofs ? r on g ecl e cin i tll i tlm i tlh v fgl v fgh v pump g ecm g ech max. 1.3 3.6 10 17 5 40 100 ? 1.0 ? 5 0 1.35 19 920 460 ? 0.84 1.68 0.42 1380 min. ? ? 0.7 1.4 7 ? ? 2.0 2.5 80 5 0 5 ? 100 ? 11 ? 4.6 340 680 12.5 0.56 0.28 0.35 1.12 1020 typ. 1.0 ? 5 ? 40 ? 20 1 12 ? ? ? 20 ? ? 1.3 ? 0.6 ? ? ? 50 ? 50 ? 2.5 1.0 400 800 ? 17 0.70 1.40 1200 unit a v v v v v v v ma mv pp mv mv mv v mv a ? ma ma v i fg =+ 100 a i cp1 =? 4ma i cp1 =+ 4ma i cp2 =? 4ma i cp2 =+ 4ma 0.4 ? ? v v cp1l v cp1h 0.65 0.25 0.45 v 0.6 0.2 0.4 v v cp2l v cp2h 0.8 0.4 0.6 v 0.55 0.15 0.35 v v a/v a/v a/v ma circuit current 1 circuit current 2 on voltage range off voltage range hall bias voltage minimum input level low voltage range high voltage range open voltage range input voltage range offset voltage ( + ) hall hysteresis level (+) hall hysteresis level ( ? ) in-phase input voltage range offset voltage ( ? ) input current output on-resistance torque limit current l torque limit current m torque limit current h charge pump output voltage input / output gain m input / output gain h input / output gain l low voltage high voltage upper saturation voltage lower saturation voltage upper saturation voltage lower saturation voltage
BD6670FM motor driver ics 6/17 ! ! ! ! measuring circuit fig.2 12v 10k ? 0.5 ? fg3 fg v h v m a1 r nf1 a2 r nf1 a3 r nf2 ps ec ecr v m h1 + h1 ? h2 + h2 ? h3 + h3 ? gsw gnd cp1 cp2 vg cnf sb v cc v hb : value of a v ps =5v i vh =10ma v pson : range of v ps that output pins become input-output table v psoff : range of v ps that output become open i cc 1 : value of a v ps =low i cc 2 : value of a v ps =high 0.01 1.65v 17v v 5v a h1 + h2 + h3 + h1 ? h2 ? h3 ? fig.3 fg3 fg v h v m a1 r nf1 a2 r nf1 a3 r nf2 ps ec ecr v m h1 + h1 ? h2 + h2 ? h3 + h3 ? gsw gnd cp1 cp2 vg cnf sb v cc v har : hall in-phase input voltage range that output pins become input-output table v inh : hall minimum input level that output pins become input-output table v hys + / ? : voltage difference h3 + from h3 ? at the point that fg voltage changes 5v 17v 5v h1 + h2 + h3 + h1 ? h2 ? h3 ? 12v 10k ? 0.5 ? 0.01 1.65v v
BD6670FM motor driver ics 7/17 fig.4 12v fg3 fg v h v m a1 r nf1 a2 r nf1 a3 r nf2 ps ec ecr v m h1 + h1 ? h2 + h2 ? h3 + h3 ? gsw gnd cp1 cp2 vg cnf sb v cc i tll : defining v rnf2 as the voltage that cnf becomes low, i tll =v rnf2 / 0.5 v gsw =low i tlm : defining v rnf2 as the voltage that cnf becomes low, i tlm =v rnf2 / 0.5 v gsw =open i tlh : defining v rnf2 as the voltage that cnf becomes low, i tlh =v rnf2 / 0.5 v gsw =high v gswl : range of v gsw that i tll < i tlm v gswh : range of v gsw that i tlh > i tlm 1.65v 5v 17v 5v v h1 + h2 + h3 + h1 ? h2 ? h3 ? fig.5 12v fg3 fg v h v m a1 r nf1 a2 r nf1 a3 r nf2 ps ec ecr v m h1 + h1 ? h2 + h2 ? h3 + h3 ? gsw gnd cp1 cp2 vg cnf sb v cc v gswop : value of v v fgh : i fg ( i fg3) = value of v2(v3) at i fg ( i fg3) = ? 100 a h1 + =m, h2 + =h, h3 + =l h1 ? =m, h2 ? =m, h3 ? =m (for fg) h1 + =l, h2 + =h, h3 + =l h1 ? =m, h2 ? =m, h3 ? =m (for fg3) v fgl : i fg ( i fg3) = value of v2(v3) at i fg ( i fg3) = 100 a h1 + =l, h2 + =m, h3 + =h h1 ? =m, h2 ? =m, h3 ? =m (for fg) h1 + =l, h2 + =h, h3 + =h h1 ? =m, h2 ? =m, h3 ? =m (for fg3) 1.65v 5v 17v 5v v 1 v 2 h1 + h2 + h3 + h1 ? h2 ? h3 ? v 3
BD6670FM motor driver ics 8/17 fig.6 12v 10k ? 5 ? 5 ? fg3 fg v h v m a1 r nf1 a2 r nf1 a3 r nf2 ps ec ecr v m h1 + h1 ? h2 + h2 ? h3 + h3 ? gsw gnd cp1 cp2 vg cnf sb v cc e c / e cr : torque control operating range e cin : value of a1 and a2 at ec=ecr=1.65v e co f s + / ? : ec voltage range that v m current is 0a monitor v rnf1 0.01 f 5 ? 1.65v 5v 0.1 f 100pf v 5v h1 + h2 + h3 + h1 ? h2 ? h3 ? 0.5 ? a 2 a 1 fig.7 12v 10k ? 5 ? fg3 fg v h v m a1 r nf1 a2 r nf1 a3 r nf2 ps ec ecr v m h1 + h1 ? h2 + h2 ? h3 + h3 ? gsw gnd cp1 cp2 vg cnf sb v cc g ecl : defining v1 as value of v at ec=1.2v and v2 as value of v at ec=1.5v on condition that gsw=0v, g ecl ={(v1 ? v2) / (1.5 ? 1.2)} / 0.5 g ech : defining v1 as value of v at ec=1.2v and v2 as value of v at ec=1.5v on condition that gsw=5v, g ecl ={(v1 ? v2) / (1.5 ? 1.2)} / 0.5 g ecm : defining v1 as value of v at ec=1.2v and v2 as value of v at ec=1.5v on condition that gsw=open, g ecl ={(v1 ? v2) / (1.5 ? 1.2)} / 0.5 0.01 5 ? 1.65v 5v 100pf v 5v h1 + h2 + h3 + h1 ? h2 ? h3 ? 17v 0.5 ? 5 ?
BD6670FM motor driver ics 9/17 fig.8 12v fg3 fg v h v m a1 r nf1 a2 r nf1 a3 r nf2 ps ec ecr v m h1 + h1 ? h2 + h2 ? h3 + h3 ? gsw gnd cp1 cp2 vg cnf sb v cc v ol : value of v on condition that output pin is l and i o =600ma r on : r on = (v oh + v ol ) / 0.6 v oh : value of v on condition that output pin is h and i o = ? 600ma 1.65v 5v 5v h1 + h2 + h3 + h1 ? h2 ? h3 ? 17v 5v 600ma a 1 , a 2 , a 3 a 1 , a 2 , a 3 measurement of v ol measurement of v oh v m 600ma v v fig.9 12v fg3 fg v h v m a1 r nf1 a2 r nf1 a3 r nf2 ps ec ecr v m h1 + h1 ? h2 + h2 ? h3 + h3 ? gsw gnd cp1 cp2 vg cnf sb v cc v pump : value of v 1.65v 5v 5v h1 + h2 + h3 + h1 ? h2 ? h3 ? 0.1 f v
BD6670FM motor driver ics 10/17 fig.10 12v fg3 fg v h v m a1 r nf1 a2 r nf1 a3 r nf2 ps ec ecr v m h1 + h1 ? h2 + h2 ? h3 + h3 ? gsw gnd cp1 cp2 vg cnf sb v cc v cp1h : value of v on condition that cp1 is h and i cp1 = ? 4ma v cp1l : value of v on condition that cp1 is l and i cp1 =4ma 1.65v 5v 5v h1 + h2 + h3 + h1 ? h2 ? h3 ? 17v v fig.11 12v fg3 fg v h v m a1 r nf1 a2 r nf1 a3 r nf2 ps ec ecr v m h1 + h1 ? h2 + h2 ? h3 + h3 ? gsw gnd cp1 cp2 vg cnf sb v cc v cp2h : value of v on condition that cp2 is h and i cp2 = ? 4ma v cp2l : value of v on condition that cp2 is l and i cp2 =4ma 1.65v 5v 5v h1 + h2 + h3 + h1 ? h2 ? h3 ? 17v v
BD6670FM motor driver ics 11/17 ! ! ! ! circuit operation 1. application (1) input-output table pin no. condition 1 condition 2 condition 3 condition 4 condition 5 condition 6 l h m m h l m m m m m m m m m m m m m m m m m m h l l h m m m m h l l h h l l h l h l h h l l h l h l h h l l h h l h l h l l h h l 12 6 4 3 input condition output condition e c < e cr e c > e cr 5 242220242220 h 1 + h 1 ? h 3 ? h 2 ? h 2 + h 3 + a 1 a 2 a 3 a 1 a 2 a 3 h l h l l h (2) hall input hall element can be used with both series and parallel connection. determining r1 and r2, make sure to leave an adequate margin for temperature and dispertion in order to satisfy in-phase input voltage range and minimum input level. a motor doesn?t reach the regular number of rotation, if hall input decrease under high temperature. v cc r1 r2 r1 v h r2 v h fig.12 parallel connection h2 h3 h1 v cc series connection h2 h1 h3
BD6670FM motor driver ics 12/17 (3) torque voltage by the voltage difference between ec and ecr, the current driving motor changes as shown in fig.13 below. i tl i m [a] 0 ecr ec [v] fig.13 forward torque reverse torque the gain of the current driving motor for the voltage of ec can be changed by the resistance of rnf and the voltage of gsw. g ecl =0.175 / rnf [a / v] (gsw=l) g ecm =0.35 / rnf [a / v] (gsw=m) g ech =0.70 / rnf [a / v] (gsw=h) (4) current limit the maximum value of the current driving motor can be changed by the resistance of rnf and the voltage of gsw. i tll =0.2 / rnf [a] (gsw=l) i tlm =0.4 / rnf [a] (gsw=m) i tlh =0.6 / rnf [a] (gsw=h)
BD6670FM motor driver ics 13/17 (5) short brake the short brake is switched by sb pin and its operation is shown in table below. sb ec < ecr h l short brake rotating forward ec > ecr short brake reverse brake output upper (3phase) fet turn off and lower (3phase) fet turn on in short brake mode, as shown fig.14. fig.14 off on off on motor off on rnf v m (6) reverse detection reverse detection is constructed as shown in fig.15. output is opened when ec>ecr and the motor is rotating reverse. fig.15 h2 + ec out ecr h2 ? h3 + h3 ? + ? + ? + ? dq ck
BD6670FM motor driver ics 14/17 motor rotation at reverse detection reverse detection is triggered and set outputs to open, when motor rotates in the reverse direction. deceleration (reverse torque) when ec > ecr forward rotation (forward torque) when ec < ecr stop motor idles in the reverse direction by inertia.
BD6670FM motor driver ics 15/17 (7) timing chart a1 output current a1 output voltage a2 output current a2 output voltage a3 output current a3 output voltage h1 + h2 + h3 + 30 fig.16
BD6670FM motor driver ics 16/17 ! ! ! ! application example + ? torque amp current sense reverse detect + ? driver matrix ps cl h1 + h2 + h1 ? h2 ? h3 + h3 ? cp1 cp2 v g c nf sb v cc gsw gnd fg3 v h fg v m v m a1 r nf 1 r nf 1 a3 r nf 2 ps ec ecr a 2 gain control charge pump hall bias matrix fig.17 dq ck qb + ? + ? + ? + ? + ? + ? + ? + ? + ? exor pwm comp hall comp hall amp tsd osc u-pre driver l-pre driver 100 ? v cc v cc 100 ? h3 h2 h1 0.5 ? 10k ? 0.1 f 0.1 f 10 f 100pf 100 f 0.01 f v cc servo signal 1.65v 1000pf 1000pf 1000pf ! ! ! ! operation notes 1. absolute maximum ratings absolute maximum ratings are those values which, if exceeded, may cause the life of a device to become significantly shorted. moreover, the exact failure mode cannot be defined, such as a short or an open. physical countermeasures, such as fuse, need to be considered when using a device beyond its maximum ratings. 2. gnd potential the gnd terminal should be the location of the lowest voltage on the chip. all other terminals should never go under this gnd level, even in transition.
BD6670FM motor driver ics 17/17 3. thermal design the thermal design should allow enough margin for actual power dissipation. 4. mounting failures mounting failures, such as misdirection or mismounts, may destroy the device. 5. electromagnetic fields a strong electromagnetic field may cause malfunctions. 6. coil current flowing into v m a coil current flows from motor into v m when torque control input changes from ececr, and v m voltage rises if v m voltage source doesn?t have an ability of current drain. a protect circuit turns on and a current (40ma (typ.)) flows from v m to gnd when v m voltage reaches to 15v (typ.). make sure that surrounding circuits work correctly and aren?t destroyed, when v m voltage rises. physical countermeasures, such as a diode for voltage clamp, need to be considered under these conditions. 7. cnf pin an appropriate capacitor (100pf (typ.)) at cnf pin make motor current smooth. make sure the motor current doesn?t oscillate, even in transition. ! ! ! ! electrical characteristics curve 050 25 75 100 125 150 2.0 1.5 1.0 0.5 2.2 0 ta ( c) pd (w) fig.18 power dissipation curve ? 70mm 70mm 1.6mm glass epoxy board. ? debating in done at 17.6mw/ c for operating aboveta=25 c. ! ! ! ! external dimensions (units : mm) 18.5 0.2 7.5 0.2 9.9 0.3 28 15 114 2.2 0.1 0.35 0.1 5.15 0.1 0.5 0.2 0.8 0.25 0.1 16.0 0.2 0.11 0.1 s 0.08 m hsop-m28

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