View BD7905BFS_1034837.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

BD7905BFS optical disc ics 1/17 6ch power driver for cd-rom, dvd-rom BD7905BFS BD7905BFS is a 6-channel driver ic that integrates all drivers necessary for optical disc driver. low vibration, low noise, and low heat operation have been realized by adopting 180 pwm driving system for spindle motor driver. the built-in 2-channel sled motor driver is used for the stepping motor. ! ! ! ! applications cd-rom, dvd-rom ! ! ! ! features 1) 3channel btl driver, 2channel pwm 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 5channels, brake mode and gain select 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 180deg 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 ? ? efficient drive by current feedback pwm drive. ? built in 2channel for stepping motor. ? actuator driver, loading driver ? ? linear btl drive system.
BD7905BFS optical disc ics 2/17 ! ! ! ! absolute maximum ratings (ta=25 c) parameter symbol unit power mos power suuply voltage preblock/btl powerblock power supply voltage pwm control block power supply voltage power dissipation operating temperature range storage temperature spv m 1,2,slrnf1,2 v cc ,slv dd ,av m dv cc pd topr tstg limits ? 55~ + 150 15 ? 1 15 7 2.6 ? 2 ? 40~ + 85 v v v w c c ? 1 power mos output terminals (9, 11, 18, 34~37pin) 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. ! ! ! ! recommended operating conditions (ta=25 c) (set the power supply voltage taking allowable dissipation into considering) parameter symbol max. typ. min. unit spv m 1, 2 ? slrnf1, 2 ? v cc ? 3 ? slv dd ? 3 ? v v slv dd , v cc v cc av m 14 12 av m 5.0 4.3 v v dv cc 2.5 ? 4 iosp 6.0 5.0 4.3 1.2 ? 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 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 slv dd and slrnf1, 2. ? 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.
BD7905BFS optical disc ics 3/17 ! ! ! ! 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 pre logic ff ff limit current limit hall bias fg reverse detect osc polarity comp limit osc pre logic stby/ brake control level shift level shift level shift tsd pre logic + ? + ? 67k 67k 188k 47k 112.5k 75k 47k 47k + ? + ? + ? + ? 117.5k 117.5k 47k 47k fg dv cc hu + hu ? hv + hv ? hw + hw ? hb pgnd1 u spv m 1 v gnd gnd gnd gnd gnd pgnd2 w spv m 2 sprnf fg ctl1 ctl2 spin dgnd ldin v c fcin tkin v cc ldo + ldo ? tko + tko ? fco + fco ? av m gnd gnd gnd gnd gnd agnd slo1 + slo1 ? slo2 + slo2 ? spcnf slrnf2 slrnf1 slv dd slin2 slin1
BD7905BFS optical disc ics 4/17 ! ! ! ! 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 ? hw + hw ? hb pgnd1 u spv m 1 v gnd gnd gnd gnd gnd pgnd2 w spv m 2 sprnf fg ctl1 ctl2 spin dgnd ldin v c 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 slin1 slin2 slv dd slrnf1 slrnf2 spcnf slo2 ? slo2 + slo1 ? slo1 + agnd gnd gnd gnd gnd gnd av m fco ? fco + tko ? tko + ldo ? ldo + v cc tkin fcin dv cc hall amp. u positive input hall amp. u negative input hall amp. v positive input hall amp. v negative input hall amp. w positive input hall amp. w negative input hall bias spindle driver power ground 1 spindle driver output u spindle driver power supply 1 spindle driver output v gnd gnd gnd gnd gnd spindle driver power ground 2 spindle driver output w spindle driver power supply 2 spindle driver current sense frequency generator output driver logic control input 1 driver logic control input 2 spindle driver input pwm block pre-ground loading driver input reference voltage input sled driver 1 input sled driver 2 input sled driver powermos pre-supply sled driver 1 current sense sled driver 2 current sense spindle driver feedback filter sled driver 2 negative output sled driver 2 positive output sled driver 1 negative output sled driver 1 positive output btl block and sled driver power ground gnd gnd gnd gnd gnd actuator driver block power supply focus driver negative output focus driver positive output tracking driver negative output tracking driver positive output loading driver negative output loading driver positive output btl pre and loading power supply tracking driver input focus driver input pwm block control power supply ? positive/negative of the output terminals are determined in reference to those of the input terminals.
BD7905BFS optical disc ics 5/17 ! ! ! ! input output circuit three-phase motor driver output hall signal input splindle driver feedback filter pin pwm driver output sled1, 2 btl driver input fo, tk, ld 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 10 8 17 19 18 11 9 3 1 5 54pin 54pin 54pin 4 2 6 31 32 35 37 34 36 45 47 46 48 51pin 51pin 44pin 49 50 51pin 51pin 51pin 7 54pin 21 54pin 52 26 53 51pin 51pin 47k ? reference voltage input 28 29 30pin 54pin 47k ? 33 54pin 10k ? 24 54pin 54pin 112.5k ? control signal input 22 23 54pin 54pin 50k ? 50k ? 50k ? 20 51pin 312.5 ? 27 51pin 3ch 2ch 10k ? 50k ? 50k ? 112.5k ? 47k ? 10k ? 150k ?
BD7905BFS optical disc ics 6/17 ! ! ! ! electrical characteristics (unless otherwise noted, ta=25 c, slv dd =v cc =12v, dv cc =av m =5v, v c =1.65v, sprnf=0.22 ? , slrnf=0.5 ? ) iq1 iq2 iq3 ist1 ist2 vdzsl gmsl ronusl ronlsl ilimsl fosc vhb ihib vhim vhicm vdzsp1 vdzsp2 gmsp1 gmsp2 ronusp ronlsp ilimsp1 ilimsp2 fosc vfgh vfgl vofft vohft volft gvft ? ? ? ? ? 5 1.0 (0.50) ? ? 0.84 (0.42) ? 0.7 ? 100 1 0 0 1.2 (0.264) 170 (37.4) ? ? 1.2 (0.264) 300 (66.0) ? ? ? ? 70 ? ? 17.7 13 9 2.5 ? 0.2 30 1.3 (0.65) 1.8 0.8 1.0 (0.50) 100 1.15 1 ? ? 10 30 1.5 (0.33) 245 (53.9) 0.6 0.25 1.5 (0.33) 440 (96.8) 100 4.9 0.1 0 0.45 0.45 19.5 22 16 4.5 0.1 0.4 55 1.6 (0.8) 2.3 1.4 1.16 (0.58) ? 1.6 5 ? 4 40 120 1.8 (0.396) 320 (70.4) 1.0 0.5 1.8 (0.396) 580 (127.6) ? ? ? 70 0.8 0.8 21.3 ma ma ma ma ma mv a/v (v/v) ? ? a (v) khz v a mv pp v mv mv arms/v (vrms/v) marms/v (mvrms/v) ? ? a (v) ma (mv) khz v v 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 slrnf = 0.5 ? il = 500ma il =? 500ma slrnf = 0.5 ? ihb = 10ma ctl1 = "h", ctl2 = "h" ctl1 = "l", ctl2 = "h" effective current ctl1 = "h", ctl2 = "h" effective current ctl1 = "l", ctl2 = "h" il = 500ma il =? 500ma ctl1 = "h", ctl2 = "h" ctl1 = "l", ctl2 = "h" il = 500ma il =? 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 fig1, 2 fig1, 2 fig1, 2 circuit current quiescent current 1 quiescent current 2 quiescent current 3 stanby-on current 1 stanby-on current 2 sled driver block input dead zone (one side) input output gain output on resistor (upper) output on resistor (lower) output limit current pwm frequency 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 1 (one side) input dead zone 2 (one side) input output gain 1 input output gain 2 output on resistor (upper) output on resistor (lower) output limit current 1 output limit current 2 pwm frequency spindle driver block ? fg output ? high voltage low voltage actuator driver block output offset voltage output saturation voltage "h" output saturation voltage "l" voltage gain this product is not designed for protection against redioactive rays.
BD7905BFS optical disc ics 7/17 vofld vohld volld gvld vih vil vmv c vmv cc ? 100 ? ? 21.5 2.0 ? 0.4 3.4 0 1.1 0.45 23.5 ? ? 0.7 3.8 100 1.4 0.8 25.5 ? 0.5 1.0 4.2 mv v v db v v v v parameter symbol min. typ. max. unit conditions circuit il = 500ma il =? 500ma fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 fig1, 2 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 this product is not designed for protection against radioactive rays.
BD7905BFS optical disc ics 8/17 ! ! ! ! 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 pre logic ff ff limit current limit hall bias fg reverse detect osc polarity comp limit osc pre logic stby/ brake control level shift level shift level shift tsd pre logic + ? + ? 67k 67k 188k 47k 112.5k 75k 47k 47k + ? + ? + ? + ? 117.5k 117.5k 47k 47k fg a iu + iu ? iv ? iw ? hu + + ++ + a iv + hv + + iw + ihb hw + + a h ? a a v a spv m vsprnf sprnf 2 1 sw-sp uv w outsp v + 100k vfg ctl1 ctl2 vinsp vinld v c dv cc a dv cc vinfc iqdv iqvc vintk v cc av m ++ + out-a5 out + out ? ld out-a4 out + out ? tk out-a3 out + out ? fc out-a1 out + out ? sl1 out-a2 out + out ? sl2 sled power supply unit slrnf2 slrnf1 slv dd vinsl2 0.01 vinsl1 fig.1 a
BD7905BFS optical disc ics 9/17 fig.2 slrnf2 slrnf1 slv dd v sw-sl sw-sl vslrnf2 vslrnf1 slrnf2 slrnf1 slv m v sled power supply sw-rl sw-il sw-il out + out ? v o v 1 1 1 2 2 2 rl 47 h il il ? a3, a4 and a5 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 2-w 2-v 2-u
BD7905BFS optical disc ics 10/17 ! ! ! ! table of measure circuit switches position 1 (v cc =spv m =slv m =12v, dv cc =av m =5v, v c =1.65v, rl (sl) =8 ?+ 47 h, rl (sp) =2 ?+ 47 h, rl (act, ld) =8 ? , slrnf=0.5 ? , sprnf=0.22 ? , h ? =2.5v, hu + =2.6v, hv + =hw + =2.4v) 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 2 111 111 111 111 111 designation input vin switch ctl 12rl sp sl il measure point conditions ? 1 check vslrnf with no output at vin = v c 5mv check vslrnf with output at vin = v c 55mv 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 + circuit current sled driver block vin2 vin3 vrnf3/rnf vrnf2/rnf vrnf1/rnf lop vrnf4/rnf vin4 vin1 vin dead zone sprnf = 0.22 ? slrnf = 0.5 ? iosp iosl iosp or iosl iop time ? 2 sled driver vin1 = 230mv, vin2 = 130mv vin3 =? 130mv, vin4 =? 230mv gm ( + ) = ( ) / 0.5 ? 230mv ? 130mv vslrnf1 ? vslrnf2 gm ( ? ) = ( ) / 0.5 ? 230mv ? 130mv vslrnf4 ? vslrnf3 ? 4 spindle driver vin1 = 300mv (gm1), 600mv (gm2) vin2 = 100mv (gm1), 300mv (gm2) vin3 =? 300mv (gm2), vin4 =? 600mv (gm2) gm1 ( + ) = ( ) / 0.22 ? 300mv ? 100mv vsprnf1 ? vsprnf2 gm2 ( + ) = ( ) / 0.22 ? 600mv ? 300mv vsprnf1 ? vsprnf2 gm2 ( ? ) = ( ) / 0.22 ? 600mv ? 300mv vsprnf4 ? vsprnf3 iop...the peak current of iosp or iosl
BD7905BFS optical disc ics 11/17 ! ! ! ! table of measure circuit switches position 2 (v cc =spv m =slv m =12v, dv cc =av m =5v, v c =1.65v, rl (sl) =8 ?+ 47 h, rl (sp) =2 ?+ 47 h, rl (act, ld) =8 ? , slrnf=0.5 ? , sprnf=0.22 ? , h ? =2.5v, hu + =2.6v, hv + =hw + =2.4v) vhb gmsp1 ronusp ronlsp ilimsp1, 2 fosc 1.65v 1.85 ? 4 3.3v 3.3v 3.3v h h h h h h h h h h h h 2 2 2 1 1 1 1 1 1 2 2 1 1 1 1 1 vdzsp1 ? 3 h h 2111 1 1 1 2 2 111 ihib 1.65v hh1111 designation input vin switch ctl 12rl sp sl il measure point conditions ? 3 check vrnf with no output at vin = v c check vrnf with output at vin = v c + 40mv see 10 of 17 ihb = 10ma current flowing in each terminal at h ?= 2.5v, h += 2.6v (2.4v) ilsp = 500ma ilsp =? 500ma ron = 0.5a 12v ? vosp ron = 0.5a vosp pin 7 ? fg ? vfgl 1.65v h h 1111 hu += 2.6v, hv += 2.4v, hw += 2.6v vfgh 1.65v h h 1111 hu += 2.6v, hv += 2.4v, hw += 2.4v vfg vfg iu + ( ? ), iv + ( ? ), iw + ( ? ) vsprnf vdzsp2 ? 3 h l 2111 ? 3 check vrnf with no output at vin = v c check vrnf with output at vin = v c 120mv vsprnf vsprnf ilimsp1, 2 3.3v h l 2111 vsprnf vsprnf outu, v, w outu, v, w vospu gmsp2 ? 4 h l 2111 see 10 of 17 vsprnf spindle driver block ? torque command ? ? hall bias ? ? hall amplifier ? hu + hv + hw + u v w condition measure point 2.4v 2.6v 2.6v source middle sink vospu iospu = 500ma 2.6v 2.4v 2.6v sink source middle vospv iospv = 500ma 2.6v 2.6v 2.4v middle sink source vospw iospw = 500ma 2.6v 2.4v 2.4v sink middle source vospu iospu =? 500ma 2.4v 2.6v 2.4v source sink middle vospv iospv =? 500ma 2.4v 2.4v 2.6v middle source sink vospw iospw =? 500ma ? 5 condition of input
BD7905BFS optical disc ics 12/17 ! ! ! ! table of measure circuit switches position 3 (v cc =spv m =slv m =12v, dv cc =av m =5v, v c =1.65v, rl (sl) =8 ?+ 47 h, rl (sp) =2 ?+ 47 h, rl (act, ld) =8 ? , slrnf=0.5 ? , sprnf=0.22 ? , h ? =2.5v, hu + =2.6v, hv + =hw + =2.4v) vih vil vofft vohft volft gvft 1.65v 1.65v 0.25v 1.65v 3.3v (0v) 0v (3.3v) h l h h h h h l h h h h 2 2 2 2 1 1 1 1 1 1 1 1 1 1 1 1 2 2 111 111 designation input vin switch ctl 12rl sp sl il measure point conditions 20log |(vo ? vofft) / 0.25)| il = 500ma il =? 500ma 20log |(vo ? vofft) / 0.25)| check active at "h" = 2.0 check stand-by at "l" = 0.5 il = 500ma il =? 500ma iqvc iqvc vo 5 ? out + ( ? ) out + ( ? ) vo vo 12 ? out + ( ? ) out + ( ? ) vo ctl1, ctl2 vmv c vmv cc 1.65v 1.65v h h h h1 1 111 111 check all output at v c = 0.7v check all output at v cc = 3.8v output output ctl1, ctl2 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 2 2 actuator driver block loading driver block ! ! ! ! circuit operation 1. driver control terminal 1 and 2 (pin22 and pin23) all the drivers and spindle-drive braking mode and input output gain 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) ll hl ? h ctl1 (pin22) ctl2 (pin23) spin > v c input output gain (spindle driver) spin < v c l h 245marms/v (typ.) 1.5arms/v (typ.) hh forward-rotation mode reverse-rotation braking mode short-circuit braking mode forward-rotation mode ... on ... off 1) 2) 3) 4) spindle sled focus tracking loading 1) standby mode the ic is brought into standby state, and its power dissipation can be limited. 2) drivers muting all the output channels except the loading are muted and their outputs are turn off.
BD7905BFS optical disc ics 13/17 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. input/output timing chart hu + hv + hw + insp u v w hu ? hv ? hw ? v c source mid sink source mid sink source mid sink abcdef gh i jkl ) forward rotation mode ) reverse rotation brake ) reverse protect ) forward rotation torque fwd fwd fwd rev
BD7905BFS optical disc ics 14/17 3. hall inputs (pin 1 to 6) and hall bias (pin 7) (spindle) hall elements can be connected either in series or in parallel. set the hall input voltage to 1.0 to 4.0v and larger than 100mv pp . hu hv hw v cc 7pin v cc 7pin hu hv hw ? parallel connection ?? series connection ? 4. torque command (spindle: pin 24, sled motor: pin 28 and 29) / output current detection terminals (spindle: pin 20, sled motor: pin 31 and 32) 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 (ctl1 = "h") sled 0.33/rnf (arms/v) 0.33/rnf (a) 0.33 112.5k / { sprnf (rin + 112.5k) } (arms/v) 53.9 112.5k / { sprnf (rin + 112.5k) } (marms/v) spindle (ctl1 = "l") 53.9/rnf (marms/v) 96.8/rnf (ma) 0.65/rnf (a/v) 0.5/rnf (a) 0.65 47k/ { slrnf (rin + 47k) } (a/v) input-output gain output-limit current gain with the added resistor 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.).
BD7905BFS optical disc ics 15/17 6. 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 off. 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) and v cc terminal (pin 51) drop to lower than 3.8v (typ.), the outputs of all the channels are turned off. 7. 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 pre logic ff ff limit current limit hall bias fg reverse detect osc polarity comp limit osc pre logic stby/ brake control level shift level shift level shift tsd pre logic + ? + ? 67k 67k 188k 47k 112.5k 75k 47k 47k + ? + ? + ? + ? 117.5k 117.5k 47k 47k fg fg loading in v c focus in tracking in loading tracking dv cc = 5v v cc = 12v av m = 5v fig.3 -com -com spindle in 5v spv m = 12v sprnf spindle hall3 hall2 hall1 sled in1 sled in2 slv m = 12v m focus sled1 sled2 slrnf2 slrnf1 stm
BD7905BFS optical disc ics 16/17 ! ! ! ! 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 20) and the sled motor drive slrnf 1 and 2 (pin 31 and 32) 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 51) is used by the spindle and that applied to slv dd (pin 30) by the sled. for this reason, be sure to apply v cc (pin 51) to the spindle and slv dd (pin 30) to the sled according to the corresponding power supply voltages to prevent voltage differences. (3) filtering capacitor it is recommended to connect 0.01 f filtering capacitor to spcnf 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. (4) bypass capacitor please connect a bypass capacitor (0.1 f) across the supply voltage lines close to the ic pins. (5) 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 70mm 2 , t = 1.6mm glass epoxy mounting.
BD7905BFS optical disc ics 17/17 ! ! ! ! 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.
appendix appendix1-rev1.0 the products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. notes no technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of rohm co.,ltd. the contents described herein are subject to change without notice. the specifications for the product described in this document are for reference only. upon actual use, therefore, please request that specifications to be separately delivered. application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. rohm co.,ltd. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by rohm co., ltd. is granted to any such buyer. products listed in this document use silicon as a basic material. products listed in this document are no antiradiation design. about export control order in japan products described herein are the objects of controlled goods in annex 1 (item 16) of export trade control order in japan. in case of export from japan, please confirm if it applies to "objective" criteria or an "informed" (by miti clause) on the basis of "catch all controls for non-proliferation of weapons of mass destruction.

▲Up To Search▲

Price & Availability of BD7905BFS

	To Download BD7905BFS Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .