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BD7903FS optical disc ics 1/16 5ch power driver for cd-rom, dvd-rom BD7903FS BD7903FS is a 5-channel driver ic that integrates all drivers necessary for cd-rom, and dvd-rom systems into a single chip. low noise, and low vibration can be achieved by applying the 180 pwm driving system for spindle motor drivers. current lag phase occurred by the load of the inductance can be reduced by using the current feedback linear btl system to driver the actuator. ! ! ! ! applications cd-rom, dvd-rom ! ! ! ! features 1) 4channel btl driver and 3phase motor driver. - all of the motor and actuator for cd-rom, dvd-rom etc. 2) these mode is able to be selected by the two control terminals. - on/off of loading, and other 4channels, brake mode of spindle driver and standby mode. 3) built-in triangular-wave generator. 4) package ssop-a54 has large power dissipation. 5) built in thermal-shut-down circuit. ? spindle driver ? ? efficient drive by current feedback pwm drive. ? built in current limit, hall bias, short brake, fg 3-phase mixed signal output and reverse protection circuit. ? low on-resistor. (ron=0.85 ? ) ? sled motor driver, loading driver ? ? voltage feedback linear btl drive system. ? actuator driver ? ? current feedback linear btl drive system. ? current phase lag influenced load inductance is little, because this type is current feedback.
BD7903FS optical disc ics 2/16 ! ! ! ! absolute maximum ratings (ta=25 c) parameter symbol unit spv m 1,2 prev cc , v m act spv cc pd topr tstg limits ? 55 to + 150 15 15 7 2.6 ? 1 ? 35 to + 85 v v v w c c power mos power suuply voltage preblock/btl powerblock power supply voltage spindle control block power supply voltage power dissipation operating temperature range storage temperature ? 1 pcb (70mm 70mm 1.6mm glass epoxy) mounting. reduced by 20.8mw for each increase in ta of 1 c over 25 c. ! ! ! ! recommended operating conditions (ta=25 c) (set the power supply voltage taking allowable dissipation into considering) parameter symbol max. typ. min. unit power mos power supply voltage1 spv m 1, 2 14 12 spv cc v preblock power supply voltage power block power supply voltage prev cc prev cc v m act 14 12 v m act 5.0 4.5 v v spindle control block power supply voltage 6.0 spv cc 5.0 4.5 v
BD7903FS optical disc ics 3/16 ! ! ! ! block diagram 1 14 15 16 17 18 19 20 21 22 23 24 25 26 27 2 3 10 9 12 13 11 6 4 5 7 8 54 41 40 39 38 37 36 35 34 33 32 31 30 29 28 53 52 45 46 43 42 44 49 51 50 48 47 duty control current detector hall bias 3fg out level shift break mode stand-by control level shift tsd matrix + ? + ? + ? spv cc fg hb spv m 1 v m hu ? hw + hw ? hu + hv ? hv + v u gnd gnd gnd gnd gnd spgnd spgnd w sprnf spin ldin cfcerr2 cfcerr1 vinfc spv m 2 vintx v c v c slin opout ctl2 powgnd prev cc ctl1 ldo + ldo ? vofc ? vofc + votk ? votk + vnffc gnd gnd gnd gnd gnd pregnd slo + slo ? vnftk v m act cfil ctkerr2 ctkerr1 prev cc powgnd pregnd v m act spv cc + ? + ? + ? + ? 7.5k 7.5k 7.5k 60k 30k 10k 15k + ? + ? 10k 25k 20k 20k 10k 10k 7.5k hall amp/reverce protect 2 2
BD7903FS optical disc ics 4/16 ! ! ! ! pin descriptions pin no. pin name function 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 fg hb spvm1 hu ? hu + hv ? hv + hw ? hw + v u gnd gnd gnd gnd gnd spgnd w sprnf spin ldin cfcerr2 cfcerr1 vinfc spvm2 vintk v c frequency generator output hall bias spindle driver power supply 1 hall amp.u negative input hall amp.u positive input hall amp.v negative input hall amp.v positive input hall amp.w negative input hall amp.w positive input spindle driver output v spindle driver output u gnd gnd gnd gnd gnd spindle driver power ground spindle driver output w spindle driver current sense spindle driver input loading driver input connection with capacitor for error amplifier connection with capacitor for error amplifier focus driver input spindle driver power supply 2 tracking driver input reference voltage input pin no. pin name function 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 ctkerr1 ctkerr2 cfil vnffc vmact vnftk votk + votk ? vofc + vofc ? pregnd gnd gnd gnd gnd gnd powgnd ldo ? ldo + slo1 ? slo1 + ctl1 prev cc ctl2 opout slin spv cc connection with capacitor for error amplifier connection with capacitor for error amplifier connection with capacitor for spindle loop feedback for focus driver actuator driver block power supply feedback for tracking driver tracking driver positive output tracking driver negative output focus driver positive output focus driver negative output pre-ground gnd gnd gnd gnd gnd btl block power ground loading driver negative output loading driver positive output slide drive negative output slide drive positive output driver logic control input 1 loading block power supply driver logic control input 2 op amp output slide driver input spindle block control power supply ? positive/negative of the output terminals are determined in reference to those of the input terminals.
BD7903FS optical disc ics 5/16 ! ! ! ! input output circuit three-phase motor driver output hall signal input current feedback btl driver output fo, tk current feedback btl driver input fo, tk btl driver input ld btl driver input sl btl driver output sl, ld pwm driver input spindle spindle driver current detection input spindle driver feedback filter pin hall bias fg signal output 46 48 45 47 50pin 50pin 50pin 2 50pin 3 17 25 18 11 10 wu v 19 50pin 2.5k ? 7 5 9 54pin 50k ? 50k ? 54pin 54pin 6 4 8 30 54pin 5.4k ? 5k ? 10k ? 10k ? 21 54pin 100 ? 34 36 35 37 32pin 10k ? 20k ? v ref 20 54pin 54pin 60k ? 24 26 50pin 50pin 10k ? 21 50pin 50pin 10k ? 53 50pin 50pin 100 ?
BD7903FS optical disc ics 6/16 connection with capacitor for error amp 2 feedback for fc, tk / connection with capacitor for error amplifier 1 control signal input op amp output reference voltage input 49 51 50pin 50k ? 50k ? 21 50pin 50pin 10k ? 31 33 23 28 50pin 50pin 50pin 50pin 10k ? 20k ? 7.5k ? 7.5k ? 22 29 51pin 10k ? 27 50pin 4ch 10k ? 50k ? 50k ? 60k ? 100 ? 10k ?
BD7903FS optical disc ics 7/16 ! ! ! ! electrical characteristics (unless otherwise noted, ta = 25 c, prev cc = spvm1/2 = 12v, spv cc = v m act = 5v, v c = 1.65v, rnf = 0.33 ? , pd = 0.5 ? ) curcuit current quiescent current 1 quiescent current 2 quiescent current 3 standby-on current 1 standby-on current 2 spindle driver block ? hall bias ? hall bias voltage spindle driver block ? hall amplifier ? input bias current input level common mode input range spindle driver block ? torque control ? input dead zone (one side) input output gain output on resistor (upper) output on resistor (lower) output limit current pwm frequency spindle driver block ? fg output ? high voltage low voltage slide driver block ? pre op amp ? input range input bias current low level output voltage max output source current max output sink current slide driver block output offset voltage output saturation voltage "h" output saturation voltage "l" voltage gain actuator driver block output offset current max output voltage amplitude trans conductance i q1 i q2 i q3 i st1 i st2 v hb i hib v him v hicm v dzsp gmsp v ohsp v omsp i limsp fosc v fgh v fgl v icmop i bop v olop i soop iisiop voofsl vomsl volsl gvsl i oo v om gm ? ? ? ? ? 0.5 ? 50 1 20 1.2 ? ? 1.5 ? 4.7 ? 0.3 ? ? ? ? ? 100 ? ? 18.0 ? 8 3.6 1.4 26 20 2.9 ? ? 1.0 1 200 ~ 50 1.5 0.6 0.25 1.8 100 4.9 0.1 ~ 80 0.1 ? ? 0 1.3 0.5 20.0 0 4.0 1.7 40 32 4.5 1 1 1.5 5 ? 4 100 1.8 1.0 0.5 2.0 ? ? 0.2 11 300 0.5 0.3 1 100 1.6 0.85 22.0 8 ? 2.0 ma ma ma ma ma v a mv v mv arms/v ? ? a khz v v v na v ma ma mv v v db ma v a/v parameter symbol min. typ. max. unit conditions circuit v cc (loading off) v cc (loading on) spv cc v cc spv cc ihb = 10ma rnf = 0.33 ? io = 500ma il =? 500ma rnf = 0.33 ? connect 100k ? between fg and 5v io = 500ma io = 500ma the gain of pre-op amp is 0db rl = 8 ? rl = 8 ? vin = bias 0.2v fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 this product is not designed for protection against radioactive rays.
BD7903FS optical disc ics 8/16 loading driver block output offset voltage output saturation voltage "h" output saturation voltage "l" voltage gain ctl1, ctl2 input high voltage input low voltage others v c drop-muting v cc drop-muting on voltage v cc drop-muting off voltage v cc drop-muting hysteresis width vofld vohld volld gvld vih vil vmvc vmv cc on vmv cc off vhyv cc ? 70 ? ? 13.5 2.0 ? 0.5 3.85 ? 100 0 1.3 0.5 15.5 ? ? 0.7 4.00 4.25 ? 70 1.6 0.85 17.5 ? 0.5 1.0 ? 4.40 ? mv v v db v v v v v mv parameter symbol min. typ. max. unit conditions circuit io = 500ma io = 500ma fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 fig.1, 2 this product is not designed for protection against radioactive rays.
BD7903FS optical disc ics 9/16 ! ! ! ! measurement circuits 1 14 15 16 17 18 19 20 21 22 23 24 25 26 27 2 3 10 9 12 13 11 6 4 5 7 8 54 41 40 39 38 37 36 35 34 33 32 31 30 29 28 53 52 45 46 43 42 44 49 51 50 48 47 duty control current detector hall bias 3fg out level shift break mode stand-by control level shift tsd matrix + ? + ? + ? v m spgnd v c prev cc powgnd pregnd v m act spv cc + ? + ? + ? + ? 7.5k 7.5k 7.5k 60k 30k 10k 15k + ? + ? 10k 25k 20k 20k 10k 10k 7.5k hall amp/reverce protect 2 2 iu + iu ? iw ? iv ? iv + hu + + + + + hv + iw + ihb hw + h ? + + v cc v cc vsprnf sprnf 2 1 sw-sp vu w spout ldin 100p spin v c acin acin v cc dv cc vol.out out + out ? sled vol.out out + out ? loading act.out nf out ? out + focus tracking 0.1 fig.1 sw-op 10k 10k 2 1 a v a a a a a dv cc vfg vmb vmsp vov vou vspgnd vow vdet vspin vldin veofc vfilfc vinfc vmsp vintk v c 100k ? v ctl1 iqvc iqdv opin opout ctl2 + + a v a vmact iqac + a iop slin voop + v vofop opout opin + 100p act.out out ? out + nf vopinsl voposl vv cc voslp voslm voldp voldm vpowgnd pregnd vofcm vofcp votkm votkp vnftk vmact vnffc vcnf veotk vfiltk
BD7903FS optical disc ics 10/16 fig.2 sw-rl sw-rl sw-il sw-il out + nf out ? v o 1 1 1 2 2 2 1 2 rl rd 47 h il il act.out v + sw-rl sw-il sw-il out + out ? v o 1 1 1 2 2 2 rl1 47 h il il vol.out v + sw-rl 1 2 47 h rlsp rlsp rlsp u v w ilsp spout sw-il 1 2 1 2 47 h 47 h 1 2-w 2-v 2-u
BD7903FS optical disc ics 11/16 ! ! ! ! table of measure circuit switches position 1 (v cc = spvm = 12v, dv cc = vmact = 5v, vc = 1.65v, rl (act) = 8 ? , rl (sl) = 8 ?+ 47 h, rl (sp) = 2 ?+ 47 h, pd = 0.5 ? , sprnf = 0.33 ? , h ?= 2.5v, hu += 2.6v, hv += hw += 2.4v) circuit current iq1 iq2 iq3 ist1 ist2 ? ? ? ? ? l l l l l l l h h h 1 1 1 1 1 11 11 11 11 11 1 1 1 1 1 1 1 1 1 1 designation input vin switch ctl 12rl sp sl il op measure point conditions iqvc iqvc iqdv iqvc iqdv spindle driver block ? torque command ? ? hall bias ? ? hall amplifier ? vhb gmsp ronusp ronlsp ilimsp fosc 1.65v 0.65 ? 2 0v 0v 0v h h h h h h h l h h h h 2 2 2 1 1 1 1 1 1 2 2 1 1 1 1 1 vdzsp ? 1 h l 2111 1 1 1 2 2 111 ihib 1.65v hh1111 ? 1 check vrnf with no output at vin = vc 20mv check vrnf with output at vin = vc 100mv ihb = 10ma current flowing in each terminal at h ?= 2.5v, h += 2.7v (2.3v) ilsp = 500ma ilsp =? 500ma ron = 0.5a 12v ? vosp ron = 0.5a vosp pin 2 ? fg ? vfgl 1.65v h h 1111 hw += 2.6v, hv += 2.6v, hw += 2.4v vfgh 1.65v h h 1111 1 1 1 1 1 1 1 1 1 1 hw += 2.6v, hv += 2.4v, hw += 2.4v vfg vfg iu + ( ? ), iv + ( ? ), iw + ( ? ) vsprnf vsprnf vsprnf outu, v, w outu, v, w vospu ? 2 spindle driver vin =? 400mv, vin =? 900mv gm ( + ) = ( )/0.33 ? vsprnf1 ? vsprnf2 900mv ? 400mv
BD7903FS optical disc ics 12/16 ! ! ! ! table of measure circuit switches position 2 (v cc = spvm = 12v, dv cc = vmact = 5v, vc = 1.65v, rl (act) = 8 ? , rl (sl) = 8 ?+ 47 h, rl (sp) = 2 ?+ 47 h, pd = 0.5 ? , sprnf = 0.33 ? , h ?= 2.5v, hu += 2.6v, hv += hw += 2.4v) actuator driver block ibop iosoop iooac vomac gmac 1.65v ? 0.20v 1.65v 3.3v (0v) hh h h h h h h 2 2 1 2 1 1 1 1 1 1 1 1 1 1 1 1 11 hh111 designation input vin switch ctl 12rl sp sl il op measure point conditions (vo ? iooac 8) / 0.2 8 gvsl 0.25v h l 211 1 1 20log|(vo ? vofsl) / 0.25)| iooac = v o /8 20log |(vo ? vofld) / 0.25)| iop = 500 a il = 500ma il =? 500ma vof iopb vo vo vo vo 12 ? out + ( ? ) out + ( ? ) vo loading driver block pre-operational amplifier block iosiop ? h h 111 iop =? 1ma vof voop volop 5v h h 111 1 1 1 1 2 2 2 1 vih vil 1.65v 1.65v h l h l2 2 111 111 check active at "h" = 2.0 check stand-by at "l" = 0.5 iqvc iqvc ctl1, ctl2 vmvc vmv cc on 1.65v 1.65v h h h h1 1 111 111 1 1 1 1 check all output at vc = 0.5v check all output at v cc = 4.0v output output vmv cc off 1.65v hh11111 check all output at v cc = 4.4v output others vofld vohld volld gvld 0.25v 1.65v 3.3v (0v) 0v (3.3v) l l l l h h h h 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 slide driver block vofsl vohsl volsl 1.65v 3.3v (0v) 0v (3.3v) h h h l l l 2 1 1 1 1 1 1 1 1 1 2 2 1 1 1 il = 500ma il =? 500ma vo 12 ? out + ( ? ) out + ( ? ) vo
BD7903FS optical disc ics 13/16 ! ! ! ! circuit operations 1. driver control terminal 1 and 2 (pin49 and pin51) all the drivers and spindle-drive braking mode can be switched on/off by inputting combinations of h-level signal (higher than 2v) and l-level signal (lower than 0.5v) to these terminals. ctl1 (pin22) ctl2 (pin23) spindle slide focus tracking loading ll hl ? h ctl1 (pin22) ctl2 (pin23) spin < v c spin > v c lh hh forward-rotation mode reverse-rotation braking mode short-circuit braking mode forward-rotation mode ... on ... off 1) 2) 3) 4) 1) standby mode the ic is brought into standby state, and its power dissipation can be limited. the outputs of all the channels are turned high-impedance. 2) drivers muting all the output channels except the loading are muted and their outputs are turn high-impedance. 3) reverse-rotation braking mode (spindle) a reverse-rotation torque is applied when spin > v c . reverse-rotation is detected with spin input and hall input. if the spindle detects reverse rotation when spin > v c , all the outputs are shorted out to gnd. 4) short-circuit braking mode (spindle) all the spindle driver outputs are shorted out to gnd when spin > v c . 2. hall inputs (pin 4 to 9) and hall bias (pin 2) (spindle) hall elements can be connected either in series or in parallel. set the hall input voltage to 1.0 to 4.0v. hu hv hw v cc pin2 ? parallel connection ? v cc pin2 ? series connection ? hu hv hw
BD7903FS optical disc ics 14/16 3. torque command (pin 20) / output current detection terminals (pin 19) the relation between the torque command input spin and the output current detection terminals input sprnf is expressed as shown below: vc spin sprnf fwd rotation dead zone + dead zone ? the input-output gain (gm) and the output-limit current (ilim) depend on the resistance of rnf (output current detection resistor). please refer to the following expression. the gain to drive the spindle motor can be decreased by connecting a resistor in series to each input terminal. spindle input-output gain output-limit current gain with the added resistor 0.5/rnf (arms/v) 0.6/rnf (a/v) 29.7k/ { rnf (rin + 60k) } (arms/v) rin : added series resistor gain expression (typ.) 4. pwm oscillation frequency the pwm oscillation for driving the spindle is free running. the oscillating frequency is 100khz (typ.). 5. muting functions a) v c -drop muting when the voltage at v c terminal (pin 27) drops to a value lower than 0.7v (typ.), the outputs of all the channels are turned high-impedance. set the v c terminal voltage to larger than 1.0v. b) v cc -drop muting when the voltages at dv cc terminal (pin 54) or v cc terminal (pin 50) drop to lower than 4.0v (typ.), the outputs of all the channels are turned high-impedance. when the voltages rise to more than 4.25v (typ.), the ic start operating again. 6. thermal-shutdown a thermal-shutdown circuit (over-temperature protection circuit) is built in to prevent the ic from thermal breakdown. use the ic under the thermal loss allowed to the package. in case the ic is left running over the allowable loss, the junction temperature rises, and the thermal-shutdown circuit works at the junction temperature of 175 c (typ.) (the outputs of all the channels are turned off). when the junction temperature drops to 150 c (typ.), the ic start operating again.
BD7903FS optical disc ics 15/16 ! ! ! ! application example 1 14 15 16 17 18 19 20 21 22 23 24 25 26 27 2 3 10 9 12 13 11 6 4 5 7 8 54 41 40 39 38 37 36 35 34 33 32 31 30 29 28 53 52 45 46 43 42 44 49 51 50 48 47 duty control current detector hall bias 3fg out level shift break mode stand-by control level shift tsd matrix + ? + ? + ? v m spgnd v c prev cc powgnd pregnd v m act spv cc + ? + ? + ? + ? 7.5k 7.5k 7.5k 60k 30k 10k 15k + ? + ? 10k 25k 20k 20k 10k 10k 7.5k hall amp/reverce protect 2 2 v cc vc opout slide in loading tracking prev cc = 12v v cc vmact = 5v fig.3 -com -com spindle input 0.1 loading input tracking input focus input 0.33 spindle fg 100k hall3 hall2 hall1 m slide m focus rd rd 0.1 0.1 spv cc = 5v 0.1 0.1 ! ! ! ! operation notes (1) wiring for sprnf considering the wiring resistance, connect each detecting resistor as close as possible to the current detection terminals for the spindle drive sprnf (pin 19) of the ic. 3 25 19 50 vm vm sprnf rnf 12v prev cc close to rnf close to ic this range of wiring is considered as detection rasistor. please wire as wide and short as possible.
BD7903FS optical disc ics 16/16 (2) filtering capacitor it is recommended to connect 0.1 f filtering capacitor to cfil terminals. this capacitor filters pwm output carrier frequency. dispersion of the cut off frequency due to circuit board wiring layout is taken into consideration. if it is difficult to filter at the recommended value due to circuit board wiring led round, the capacity can be increased. in this case, note that the output transmission delay time may be longer. (3) bypass capacitor please connect a bypass capacitor (0.1 f) across the supply voltage lines close to the ic pins and please connect large capacity and small esr capacitor (10 f ) close to the power supply voltage lines. (4) supply fault, ground fault, and short-circuit between output terminals do not short-circuit between any output pin and supply pin (supply fault) or ground (ground fault), or between any output pins (load short-circuit). when mounting the ic on the circuit board, be extremely cautions about the orientation of the ic. if the orientation is mistaken, the ic may break down, and produce smoke in some cases. ! ! ! ! electrical characteristic curves 0 100 75 50 25 125 150 2 0 1 3 power dissipation : pd (w) ambient temperature : ta ( c) fig.4 power dissipation 2.6w ? on less than 25.7% (percentage occupied by copper foil), 70 70mm 2 , t = 1.6mm glass epoxy mounting. ! ! ! ! external dimensions (units : mm) ssop-a54 0.1 11.4 0.2 13.4 0.3 2.2 0.1 0.1 0.8 127 54 28 22.0 0.2 4.0 0.2 6.0 0.2 0.36 0.1 0.15 0.1 0.3min.

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