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BD7904FS optical disc ics 1/18 5ch power driver for cd-rom, dvd-rom BD7904FS BD7904FS is a 5-channel driver ic that integrates all drivers and 3.3v regulator necessary for cd-rom, and dvd-rom systems into a single chip. low head operation can be achieved by applying the pwm driving system for sled and spindle motor drivers. ! ! ! ! applications cd-rom, dvd-rom ! ! ! ! features 1) 3channel btl driver, 1channel pwm driver and 3phase motor driver. - all of the motor and actuator for cd-rom, dvd-rom etc. 2) on/off for each driver, brake mode switching of spindle, and stand-by mode switching can be controlled by the two control terminals. 3) built-in triangular-wave generator. 4) ssop-a54 for strong head radiation. 5) built in thermal-shut-down circuit. 6) fg 3phase synthetic output. ! ! ! ! absolute maximum ratings (ta=25 c) parameter symbol unit spvm1,2,slrnf v cc ,slvdd,avm dv cc pd topr tstg limits ? 55~ + 150 15 ? 1 15 7 2.6 ? 2 ? 35~ + 85 v v v w c c power mos power suuply voltage preblock/btl powerblock power supply voltage pwm control block, reg power supply voltage power dissipation operating temperature range storage temperature ? 1 power mos output terminals (10, 11, 18, 47, 48pin) is contained. ? 2 pcb (70mm 70mm 1.6mm glass epoxy) mounting. reduced by 20.8mw for each increase in ta of 1 c over 25 c.
BD7904FS optical disc ics 2/18 ! ! ! ! recommended operating conditions (ta=25 c) (set the power supply voltage taking allowable dissipation into considering) parameter symbol max. typ. min. unit spvm1, 2 ? slrnf ? v cc ? 3 ? slvdd ? 3 ? v v slvdd, v cc v cc avm 14 12 avm 5.0 4.3 v v dv cc 2.5 ? 4 iosp 6.0 5.0 4.3 1.0 ? v a 0.8 ioo 0.5 ? a power mos power supply voltage 1 power mos power supply voltage 2 preblock power supply voltage power block power supply voltage pwm control block, reg power supply voltage spindle output current sl/fo/tr/lo output current ? 3 set the same supply voltage to v cc and spvm1, 2 to slvdd and slrnf. ? 4 the current is guaranteed 3.0a in case of the current is turned on/off in a duty-ratio of less than 1/10 with a maximum on-time of 5msec. ! ! ! ! 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 ff current limit hall bias fg reverse detect current comp osc polarity comp pwm out limit pre logic ff osc level shift stby/ brake control level shift level shift tsd 3-phase matrix vc bg (1.3v) + ? + ? + ? + ? + ? + ? + ? fg hu + hu ? hv + hv ? hw + hw ? spvm1 ctl1 ctl2 u v gnd gnd gnd gnd gnd pgnd w vc spin sprnf hb spvm2 dgnd dv cc regout regnf ldin slrnf slopi v cc slopo slvdd ldo + ldo ? tko + tko ? fco + fco ? avm gnd gnd gnd gnd gnd agnd slo + slo ? fcopo fcopi tkopo tkopi reggnd fg + ? + ? + ?
BD7904FS optical disc ics 3/18 ! ! ! ! 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 hu + hu ? hv + hv ? spvm1 hw + hw ? ctl1 ctl2 u v gnd gnd gnd gnd gnd pgnd w vc spin sprnf hb spvm2 dgnd dv cc regout regnf hall amp. u positive input hall amp. u negative input hall amp. v positive input hall amp. v negative input spindle driver power supply 1 hall amp. w positive input hall amp. w negative input driver logic control input 1 driver logic control input 2 spindle driver output u spindle driver output v gnd gnd gnd gnd gnd spindle driver power ground spindle driver output w reference voltage input spindle driver input spindle driver current sense hall bias spindle driver power supply 2 pwm block pre-ground pwm block control power supply regulator output voltage pin regulator return pin 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 reggnd tkopi tkopo avm fcopi fcopo fco ? fco + tko ? tko + agnd gnd gnd gnd gnd gnd v cc ldo ? ldo + slo ? slo + slvdd slopo slopi slrnf ldin fg regulator block ground tracking driver op-amp-input tracking driver op-amp output actuator driver block power supply focus driver op-amp-input focus driver op-amp output focus driver negative output focus driver positive output tracking driver negative output tracking driver positive output ground gnd gnd gnd gnd gnd btl pre and loading power supply loading driver negative output loading driver positive output sled driver negative output sled driver positive output sled driver powermos pre-supply sled driver op-amp output sled driver op-amp- input sled driver current sense loading driver input frequency generator output ? positive/negative of the output terminals are determined in reference to those of the input terminals.
BD7904FS optical disc ics 4/18 ! ! ! ! input output circuit three-phase motor driver output hall signal input pwm driver output sled btl driver input fo, tk pwm driver input sled1, 2 pwm driver input spindle btl driver output fo, tk btl driver output ld spindle driver current detection input hall bias fg signal output 5 17 23 18 11 10 52 38 48 47 21 44pin 3 1 6 25pin 25pin 25pin 4 2 7 35 37 34 36 44pin 44pin 31pin 45 46 44pin 44pin 44pin 22 25pin 54 25pin 32 29 44pin 44pin vc 51 49pin 49pin vc 20 25pin 25pin 6 5
BD7904FS optical disc ics 5/18 regulator output pwm driver input loading regulator regnf terminal control signal reference voltage input 19 44pin 10k ? 15k ? 50k ? 50k ? control signal input 26 25pin 20k ? 25pin 25pin 30 8 9 25pin 25pin 50k ? 50k ? 50k ? 27 25pin 51.5k ? 32.76k ? b.g. 28 53 44pin 44pin 20k ? vc 2
BD7904FS optical disc ics 6/18 ! ! ! ! electrical characteristics (unless otherwise noted, ta=25 c, slvdd=v cc =12v, dv cc =avm=5v, vc=1.65v, sprnf=0.33 ? , slrnf=0.5 ? ) circuit 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 minimum 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 sled driver block input dead zone (one side) input output gain output on resistor (upper) output on resistor (lower) output limit current pwm frequency actuator driver block output offset voltage output saturation voltage "h" output saturation voltage "l" voltage gain iq1 iq2 iq3 ist1 ist2 vhb ihib vhim vhicm vdzsp gmsp ronusp ronlsl ilimsl fosc vfgh vfgl vdzsl gmsl ronusl ronlsl ilimsl fosc vofft vohft volft gvft ? ? ? ? ? 0.7 ? 50 1 20 2.4 (0.8) ? ? 0.74 (0.24) ? ? ? 0 0.8 (0.4) ? ? 0.48 (0.24) ? ? 50 ? ? 16.0 11 9.5 3.5 2.2 0.65 1.2 1 ? ? 50 3.0 (1.0) 0.6 0.35 0.95 (0.31) 100 4.9 0.1 10 1.0 (0.5) 1.5 0.9 0.62 (0.31) 100 0 0.45 0.45 17.5 19 16 6.5 3.7 1.0 1.6 5 ? 4 90 3.6 (1.2) 1.0 0.7 1.16 (0.38) ? ? ? 40 1.2 (0.6) 2.0 1.4 0.76 (0.38) ? 50 0.8 0.8 19.0 ma ma ma ma ma v a mv pp v mv a/v (v/v) ? ? a (v) khz v v mv a/v (v/v) ? ? a (v) khz mv v v db parameter symbol min. typ. max. unit conditions circuit v cc (loading off) v cc (loading on) dv cc v cc dv cc ihb = 10ma sprnf = 0.33 ? ip = 500ma io = 500ma sprnf = 0.33 ? 100k ? pull up to dv cc slrnf = 0.5 ? io = 500ma io = 500ma slrnf = 0.5 ? io = 500ma io = 500ma fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 this product is not designed for protection against redioactive rays.
BD7904FS optical disc ics 7/18 sled/actuator driver pre-operational amplifier block input offset voltage input bias current common mode input range output source current output sink current "h" level output voltage "l" level output voltage loading driver block output offset voltage output saturation voltage "h" output saturation voltage "l" voltage gain regulator block rout pin output voltage peak output current load regulation line regulation ctl1, ctl2 input high voltage input low voltage others vc drop-muting v cc drop-muting vofop ibop vicm iosoop iosiop vohop volop vofld vohld volld gvld vreg iormax ? vrl ? vv cc vih vil vmvc vmv cc ? 6 ? 0.4 0.3 3 11.5 (4.5) 0 ? 50 ? ? 16.0 3.13 ? ? ? 2.0 ? 0.4 3.4 0 20 ? ? ? 11.9 (4.9) 0.1 0 1.1 0.45 17.5 3.3 ? 10 3 ? ? 0.7 3.8 6 300 10.8 (4.0) ? ? ? 0.4 50 1.4 0.8 19.0 3.47 500 30 10 ? 0.5 1.0 4.2 mv na v ma ma v v mv v v db v ma mv mv v v v v parameter symbol min. typ. max. unit conditions circuit ( ) : sled block ( ) : sled block io = 500ma io = 500ma ireg = 100ma, vrout = 3.3v dv cc = 4.5~5.5v fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 this product is not designed for protection against radioactive rays.
BD7904FS optical disc ics 8/18 ! ! ! ! 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 ff current limit hall bias fg reverse detect current comp osc polarity comp pwm out limit pre logic ff osc level shift stby/ brake control level shift level shift tsd 3-phase matrix vc bg (1.3v) + ? + ? + ? + ? + ? + ? + ? fg + ? + ? + ? a iu + iu ? iw ? iv ? hu + + + + + a iv + hv + + iw + ihb ireg iqdv dv cc hw + + a h ? a a v a spvm [ = v cc ] vrnf rnf 2 1 sw-sp sw-sl uv w outsp ctl1 ctl2 vc spin a ldin dv cc vfgh slvm slrnf 100k vslrnf iqvc v cc + out-a1 out + out ? sl out-a4 out + out ? ld out-a3 out + out ? tk out-a2 out + out ? fc opamp a3 out in ? opamp a2 out in ? opamp a1 out in ? avm fig.1 a + v v 2 1
BD7904FS optical disc ics 9/18 fig.2 sw-rl sw-il sw-il out + out ? v o v 1 1 1 2 2 2 rl 47 h il il ? a2, a3, and a4 require no coil. (47 h) out-a sw-rl 1 2 47 h rlsp u v w il outsp sw-rl sw-il 1 1 2 47 h rlsp 47 h rlsp 3 2 opin ? opout 30k sw-op opamp 1 2 iop iopb in ? 30k voop vof v c v v a
BD7904FS optical disc ics 10/18 ! ! ! ! table of measure circuit switches position 1 (v cc =spvm=slvm=12v, dv cc =avm=5v, vc=1.65v, rl (act) =8 ? , rl (sl) =8 ?+ 47 h, rl (sp) =2 ?+ 47 h, slrnf=0.5 ? , sprnf=0.33 ? , h ? =2.5v, hu + =2.6v, hv + =hw + =2.4v) circuit current sled driver block iq1 iq2 iq3 ist1 ist2 gmsl ronusl ronlsl ilimsl fosc ? ? ? ? ? 1.45 *2 3.3v (0v) 3.3v (0v) 0v (3.3v) l l l l l l l h h h h h h h h h h h h h 1 2 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 vdzsl *1 h h 2111 1 1 1 2 2 1 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 ? 1 check vslrnf with no output at vin = vc check vslrnf with output at vin = vc 40mv see bellow ilsl = 500ma ilsl =? 500ma ron = 0.5a vosl + ( ? ) ron = 0.5a 12v ? vosl + ( ? ) iqvc iqvc iqdv iqvc iqdv vslrnf vslrnf vslrnf out + ( ? ) out + ( ? ) vosl + vin2 vin3 vrnf3/rnf vrnf2/rnf vrnf1/rnf lop vrnf4/rnf vin4 vin1 vin dead zone sprnf = 0.33 ? slrnf = 0.5 ? iosp iosl iosp or iosl iop time ? 2 sled driver vin1 = 240mv, vin2 = 140mv vin3 =? 140mv, vin =? 240mv gm ( + ) = ( ) / 0.5 ? 240mv ? 140mv vslrnf1 ? vslrnf2 gm ( ? ) = ( ) / 0.5 ? 240mv ? 140mv vslrnf4 ? vslrnf3 ? 4 spindle driver vin1 = 150mv, vin2 = 100mv vin3 =? 100mv, vin =? 150mv gm ( + ) = ( ) / 0.33 ? 150mv ? 100mv vsprnf1 ? vsprnf2 gm ( ? ) = ( ) / 0.33 ? 150mv ? 100mv vsprnf4 ? vsprnf3 iop...the peak current of iosp or iosl
BD7904FS optical disc ics 11/18 ! ! ! ! table of measure circuit switches position 2 (v cc =spvm=slvm=12v, dv cc =avm=5v, vc=1.65v, rl (act) =8 ? , rl (sl) =8 ?+ 47 h, rl (sp) =2 ?+ 47 h, slrnf=0.5 ? , sprnf=0.33 ? , h ? =2.5v, hu + =2.6v, hv + =hw + =2.4v) spindle driver block ? torque command ? ? hall bias ? ? hall amplifier ? vhb gmsp ronusp ronlsp ilimsp fosc 1.65v 1.85 ? 4 3.3v 3.3v 3.3v 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 ? 3 h l 2111 1 1 1 2 2 111 ihib 1.65v hh1111 designation input vin switch ctl 12rl sp sl il op measure point conditions ? 2 check vrnf with no output at vin = vc 20mv check vrnf with output at vin = vc 90mv see 10 of 18 previous page ihb = 10ma current flowing in each terminal at h ?= 2.5v, hw += 2.7v (2.3v), hv = 2.5v ilsp = 500ma ilsp =? 500ma ron = 0.5a 12v ? vosp ron = 0.5a vosp pin 22 ? fg ? vfgl 1.65v h h 1111 hu += 2.6v, hv += 2.6v, hw += 2.4v vfgh 1.65v h h 1111 1 1 1 1 1 1 1 1 1 1 hu += 2.6v, hv += 2.4v, hw += 2.4v vfg vfg iu + ( ? ), iv + ( ? ), iw + ( ? ) vsprnf vsprnf vsprnf outu, v, w outu, v, w vospu hu + hv + hw + u v w condition measure point 2.4v 2.6v 2.6v source hi-z sink vospu iospu = 500ma 2.6v 2.4v 2.6v sink source hi-z vospv iospv = 500ma 2.6v 2.6v 2.4v hi-z sink source vospw iospw = 500ma 2.6v 2.4v 2.4v sink hi-z source vospu iospu =? 500ma 2.4v 2.6v 2.4v source sink hi-z vospv iospv =? 500ma 2.4v 2.4v 2.6v hi-z source sink vospw iospw =? 500ma ? 5 condition of input
BD7904FS optical disc ics 12/18 ! ! ! ! table of measure circuit switches position 3 (v cc =spvm=slvm=12v, dv cc =avm=5v, vc=1.65v, rl (act) =8 ? , rl (sl) =8 ?+ 47 h, rl (sp) =2 ?+ 47 h, slrnf=0.5 ? , sprnf=0.33 ? , h ? =2.5v, hu + =2.6v, hv + =hw + =2.4v) actuator driver block vofop ibop iosoop vofft vohft volft gvft ? 1.65v ? 0.25v 1.65v 3.3v (0v) 0v (3.3v) h h h h h h h h h h h h 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 11 11 hh111 designation input vin switch ctl 12rl sp sl il op measure point conditions 20log |(vo ? vofft) / 0.25)| il = 500ma il =? 500ma 20log |(vo ? vofft) / 0.25)| iop = 320 a il = 500ma il =? 500ma vof vof iopb vo 5 ? out + ( ? ) out + ( ? ) vo vo 12 ? out + ( ? ) out + ( ? ) vo loading driver block pre-operational amplifier block iosiop vohop ? 0v h h h h1 1 11 11 iop =? 4ma vof voop voop volop vreg 5v ? h h h h1 1 11 1 1 1 1 1 1 2 2 2 2 1 1 111 pin27 pin27 pin27 pin27 regulator block ? vrl ? vv cc ? ? h h h h1 1 111 111 ireg = 100ma iormax ? h h 1111 dv cc = 4.5v~5.5v 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 1.65v 1.65v h h h h1 1 111 111 1 1 1 1 1 1 1 1 check all output at vc = 0.7v check all output at v cc = 3.8v output 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
BD7904FS optical disc ics 13/18 ! ! ! ! circuit operation 1. driver control terminal 1 and 2 (pin 8 and pin 9) 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 (pin8) ctl2 (pin9) spindle sled focus tracking regulator ll hl ? h loading ctl1 (pin8) ctl2 (pin9) spin > vc spin < vc 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 all blocks except for the regulator are standby-mode. 2) drivers muting all the output channels except the loading are muted and there outputs are turn off. 3) reverse-rotation braking mode (spindle) a reverse-rotation torque is applied when spin < vc. reverse-rotation is detected with spin input and hall input. if the spindle detects reverse rotation when spin < vc, 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 < vc. 5) regulator regulator actives in all the mode.
BD7904FS optical disc ics 14/18 2. input/output timing chart hu + hv + hw + spin u v w hu ? hv ? hw ? vref source hi-z sink source hi-z sink source hi-z sink abcdef gh i jkl ) forward rotation mode ) reverse rotation brake ) reverse protect ) short brake fwd fwd fwd rev
BD7904FS optical disc ics 15/18 ) forward-rotation mode in this mode, the disc rotation is started and accelerated. when forward-rotation signal inputs from the hall elements to the positive spindle-drive input terminals (spin > v c ), the spindle-drive output terminals output forward torque signal. hu + hu ? hv + hv ? hw + hw ? uvw l a b c d e f h l h h sink sink sink sink lhhlh hi-z hi-z lhhll source source source source hlhll source source hllhl hi-z hi-z hi-z hi-z hllhh l l h h h l sink sink hall amplifier input (forward rotation) spin > v c source = pwm ? , ?? ) braking mode in this mode, the disc rotation is decelerated and stopped. ? reverse-rotation braking ? when the forward-rotation signal inputs from the hall elements to the negative spindle-drive input terminals (spin < v c ), the spindle-drive output terminals output reverse torque signal. hu + hu ? hv + hv ? hw + hw ? uvw l g h i j k l hlhh sink sink sink sink lhhlh hi-z hi-z lhhll source source source source hlhll source source hllhl hi-z hi-z hi-z hi-z hllhh l l h h h l sink sink hall amplifier input (forward rotation) spin < v c source = pwm 3. hall inputs (pin 1 to 4, 6, 7) and hall bias (pin 22) (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 22pin ? parallel connection ? v cc 22pin ? series connection ? hu hv hw
BD7904FS optical disc ics 16/18 4. torque command (spindle: pin 20, sled motor: pin 50) / output current detection terminals (spindle: pin 21, sled motor: pin 52) the relation between the torque command input and the output current detection terminals input is expressed as shown below: vc spin slin1, 2 sprnf slrnf 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 or the sled motor can be decreased by connecting a resistor in series to each input terminal. spindle sled 1.0/rnf 0.3/rnf 15k/ { sprnf (rin + 15k) } 0.5/rnf 0.3/rnf 0.5 47k/ { slrnf (rin + 47k) } input-output gain gm (a/v) output-limit current ilim (a) gain with the added resistor gm (a/v) gain expression rin : added series resistor 5. pwm oscillation frequency the pwm oscillation for driving the spindle and sled is free running. the oscillating frequency is 100khz (typ.). 6. regulator 3.3v is possible by connecting regnf (27 pin) with regout (26 pin). and, adjust by your inserting resistance when you use it in other voltage. + ? bg (1.3v) r3 r1 out1 r2 r4 r3 = 51.5k ? r4 = 32.76k ? out1 = bg { r1 (r2 + r3 + r4) + r2 (r3 + r4) } /r2r4
BD7904FS optical disc ics 17/18 7. muting functions a) vc-drop muting when the voltage at vc terminal (pin 19) drops to a value lower than 0.7v (typ.), the outputs of all the channels are turned off. set the vc terminal voltage to larger than 1.0v. b) v cc -drop muting when the voltages at dv cc terminal (pin 25) and v cc terminal (pin 44) drop to lower than 3.8v (typ.), the outputs of all the channels are turned off. the hysteresis voltage width is 80mv (typ.). 8. 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. ! ! ! ! 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 ff current limit hall bias fg reverse detect current comp osc polarity comp pwm out limit pre logic ff osc level shift stby/ brake control level shift level shift tsd 3-phase matrix vc bg (1.3v) + ? + ? + ? + ? + ? + ? + ? fg + ? + ? + ? regout dv cc = 5v vc fg loading in loading tracking tracking in slvm = 12v slrnf v cc = 12v avm = 5v fig.3 -com -com spindle in spvm = 12v rnf spindle hall3 hall2 hall1 m sled m focus focus in sled in
BD7904FS optical disc ics 18/18 ! ! ! ! operation notes (1) wiring for sprnf and slrnf considering the wiring resistance, connect each detecting resistor as close as possible to the current detection terminals for the spindle drive sprnf (pin 21) and the sled motor drive slrnf (pin 52) of the ic. (2) current detection reference voltage the detection of current in the spindle and sled involves the detection of voltage between the detection resistances, but as the reference voltage of internal circuit, the voltage applied to v cc (pin 44) is used by the spindle and that applied to slvdd (pin 49) by the sled. for this reason, be sure to apply v cc (pin 44) to the spindle and slvdd (pin 49) to the sled according to the corresponding power supply voltages to prevent voltage differences. (3) bypass capacitor please connect a bypass capacitor (1 f) across the supply voltage lines close to the ic pins. (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) 2.6w fig.4 power dissipation ? on less than 25.7% (percentage occupied by copper foil), 70 70mm2, 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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