BD7905BFS Optical disc ICs 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. 1/17 BD7905BFS Optical disc ICs !Absolute maximum ratings (Ta=25C) Parameter POWER MOS power suuply voltage Symbol Limits Unit SPVM1,2,SLRNF1,2 151 V VCC,SLVDD,AVM 15 V DVCC 7 V Preblock/BTL powerblock power supply voltage PWM control block power supply voltage Pd 2.62 W Operating temperature range Topr -40~+85 C Storage temperature Tstg -55~+150 C Power dissipation 1 POWER MOS output terminals (9, 11, 18, 34~37pin) is contained. 2 PCB (70mmx70mmx1.6mm glass epoxy) mounting. Reduced by 20.8mW for each increase in Ta of 1C over 25C. !Recommended operating conditions (Ta=25C) (Set the power supply voltage taking allowable dissipation into considering) Parameter POWER MOS Power supply voltage 1 Symbol Min. Typ. Max. Unit SPVM1, 2 - VCC3 - V POWER MOS Power supply voltage 2 SLRNF1, 2 - SLVDD3 - V Preblock Power supply voltage SLVDD, VCC AVM 12 14 V Power block Power supply voltage AVM 4.3 5.0 VCC V PWM control block Power supply voltage DVCC 4.3 5.0 6.0 V A A Spindle output current Iosp - 1.2 2.54 SL/FO/TR/LO output current Ioo - 0.5 0.8 3 Set the same supply voltage to VCC and SPVM1, 2 to SLVDD 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. 2/17 BD7905BFS Optical disc ICs DVCC FCIN TKIN VCC LDO+ LDO- TKO+ TKO- FCO+ FCO- AVM GND GND GND GND GND AGND SLO1+ SLO1- SLO2+ SLO2- SPCNF SLRNF2 SLRNF1 SLVDD SLIN2 SLIN1 !Block diagram 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 47k LEVEL SHIFT PRE LOGIC 117.5k - TSD 47k 67k LIMIT - FF OSC + LIMIT Current LIMIT OSC FG - FF 117.5k + 47k PRE LOGIC Polarity COMP REVERSE DETECT + 47k LEVEL SHIFT + - 67k LEVEL SHIFT 188k + - + - 75k PRE LOGIC 47k 112.5k FG 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 HU- HV+ HV- HW+ HW- HB PGND1 U SPVM1 V GND GND GND GND GND PGND2 W SPVM2 SPRNF FG CTL1 CTL2 24 25 26 27 VC 3 LDIN 2 SPIN 1 HU+ HALL BIAS DGND STBY/ BRAKE CONTROL 3/17 BD7905BFS Optical disc ICs !Pin descriptions Pin No. Pin name Pin No. Pin name 1 HU+ Hall amp. U positive input Function 28 SLIN1 Sled driver 1 input Function 2 HU- Hall amp. U negative input 29 SLIN2 Sled driver 2 input 3 HV+ Hall amp. V positive input 30 SLVDD Sled driver PowerMOS pre-supply 4 HV- Hall amp. V negative input 31 SLRNF1 Sled driver 1 current sense 5 HW+ Hall amp. W positive input 32 SLRNF2 Sled driver 2 current sense 6 HW- Hall amp. W negative input 33 SPCNF Spindle driver feedback filter 7 HB Hall bias 34 SLO2- Sled driver 2 negative output 8 PGND1 Spindle driver power ground 1 35 SLO2+ Sled driver 2 positive output 9 U Spindle driver output U 36 SLO1- Sled driver 1 negative output 10 SPVM1 Spindle driver power supply 1 37 SLO1+ Sled driver 1 positive output BTL block and sled driver power ground 11 V Spindle driver output V 38 AGND 12 GND GND 39 GND GND 13 GND GND 40 GND GND 14 GND GND 41 GND GND 15 GND GND 42 GND GND 16 GND GND 43 GND GND 17 PGND2 Spindle driver power ground 2 44 AVM Actuator driver block power supply 18 W Spindle driver output W 45 FCO- Focus driver negative output 19 SPVM2 Spindle driver power supply 2 46 FCO+ Focus driver positive output 20 SPRNF Spindle driver current sense 47 TKO- Tracking driver negative output 21 FG Frequency generator output 48 TKO+ Tracking driver positive output 22 CTL1 Driver logic control input 1 49 LDO- Loading driver negative output 23 CTL2 Driver logic control input 2 50 LDO+ Loading driver positive output 24 SPIN Spindle driver input 51 VCC PWM block pre-ground 52 TKIN Tracking driver input Loading driver input 53 FCIN Focus driver input Reference voltage input 54 DVCC PWM block control power supply 25 DGND 26 LDIN 27 VC BTL pre and Loading power supply Positive/negative of the output terminals are determined in reference to those of the input terminals. 4/17 BD7905BFS Optical disc ICs !Input output circuit Three-phase motor driver output 19 Spindle driver current detection input Hall bias 10 54pin 51pin 312.5 18 11 7 20 9 8 17 Splindle driver feedback filter pin Hall signal input 54pin 54pin FG signal output 54pin 54pin 54pin 1 2 3 4 5 6 21 33 10k PWM driver output SLED1, 2 BTL driver output FO, TK BTL driver output LD 31 32 44pin 51pin 51pin 51pin 34 35 45 46 36 37 47 48 BTL driver input FO, TK, LD 51pin 49 PWM driver input SLED1, 2 51pin 51pin 50 PWM driver input Spindle 54pin 51pin 54pin 30pin 54pin 26 52 28 47k 53 29 24 47k 112.5k Reference voltage input Control signal input 54pin 51pin 54pin 112.5k 10k 50k 50k 27 50k 47k 10k 150k 50k 22 23 50k x3ch x2ch 5/17 BD7905BFS Optical disc ICs !Electrical characteristics (unless otherwise noted, Ta=25C, SLVDD=VCC=12V, DVCC=AVM=5V, VC=1.65V, SPRNF=0.22, SLRNF=0.5) Parameter Symbol Min. Typ. Max. Unit Conditions Circuit Quiescent current 1 IQ1 - 13 22 mA VCC (Loading OFF) Fig1, 2 Quiescent current 2 IQ2 - 9 16 mA VCC (Loading ON) Fig1, 2 Quiescent current 3 IQ3 - 2.5 4.5 mA DVCC Fig1, 2 Stanby-on current 1 IST1 - - 0.1 mA VCC Fig1, 2 Stanby-on current 2 IST2 - 0.2 0.4 mA DVCC Fig1, 2 VDZSL 5 1.0 (0.50) - 30 1.3 (0.65) 1.8 55 1.6 (0.8) 2.3 mV A/V (V/V) fosc - 0.84 (0.42) - 0.8 1.0 (0.50) 100 1.4 1.16 (0.58) - VHB 0.7 1.15 Circuit current Sled driver block Input dead zone (one side) Input output gain gmSL Output ON resistor (upper) RONUSL Output ON resistor (lower) RONLSL Output limit current ILIMSL PWM frequency Fig1, 2 SLRNF=0.5 Fig1, 2 IL=500mA Fig1, 2 A (V) kHz IL=-500mA Fig1, 2 SLRNF=0.5 Fig1, 2 1.6 V IHB=10mA Fig1, 2 Spindle driver block Hall bias Hall bias voltage Fig1, 2 Spindle driver block Hall amplifier Input bias current IHIB - 1 5 A Fig1, 2 Input level VHIM 100 - - mVPP Fig1, 2 VHICM 1 - 4 V Fig1, 2 40 mV Common mode input Range Spindle driver block Torque control Input dead zone 1 (one side) VDZSP1 0 10 Input dead zone 2 (one side) VDZSP2 0 1.2 (0.264) 170 (37.4) - CTL1="H", CTL2="H" Fig1, 2 30 1.5 (0.33) 245 (53.9) 0.6 120 mV CTL1="L", CTL2="H" 1.8 Arms/V Effective current (0.396) (Vrms/V) CTL1="H", CTL2="H" 320 mArms/V Effective current (70.4) (mVrms/V) CTL1="L", CTL2="H" 1.0 IL=500mA Fig1, 2 fosc - 1.2 (0.264) 300 (66.0) - 0.25 1.5 (0.33) 440 (96.8) 100 0.5 1.8 (0.396) 580 (127.6) - A (V) mA (mV) kHz High voltage VFGH - 4.9 - V Fig1, 2 Low voltage VFGL - 0.1 - V Fig1, 2 VOFFT -70 0 70 mV Fig1, 2 Output saturation voltage "H" VOHFT - 0.45 0.8 V IL=500mA Fig1, 2 Output saturation voltage "L" VOLFT - 0.45 0.8 V IL=-500mA Fig1, 2 Voltage gain GVFT 17.7 19.5 21.3 dB Input output gain 1 Input output gain 2 Output ON resistor (upper) gmSP1 gmSP2 RONUSP Output ON resistor (lower) RONLSP Output limit current 1 ILIMSP1 Output limit current 2 ILIMSP2 PWM frequency Fig1, 2 Fig1, 2 Fig1, 2 IL=-500mA Fig1, 2 CTL1="H", CTL2="H" Fig1, 2 CTL1="L", CTL2="H" Fig1, 2 Fig1, 2 Spindle driver block FG output Actuator driver block Output offset voltage Fig1, 2 This product is not designed for protection against redioactive rays. 6/17 BD7905BFS Optical disc ICs Parameter Symbol Min. Typ. Max. Unit Output offset voltage VOFLD Output saturation voltage "H" VOHLD Output saturation voltage "L" Voltage gain Conditions Circuit -100 0 100 mV - 1.1 1.4 V IL=500mA Fig1, 2 VOLLD - 0.45 0.8 V IL=-500mA Fig1, 2 GVLD 21.5 23.5 25.5 dB Fig1, 2 Input high voltage VIH 2.0 - - V Fig1, 2 Input low voltage VIL - - 0.5 V Fig1, 2 VC drop-muting VMVC 0.4 0.7 1.0 V Fig1, 2 VCC drop-muting VMVCC 3.4 3.8 4.2 V Fig1, 2 Loading driver block Fig1, 2 CTL1, CTL2 Others This product is not designed for protection against radioactive rays. 7/17 BD7905BFS Optical disc ICs !Measurement circuits 54 47 46 45 37 36 35 34 SLVDD 48 A IQDV SLRNF1 OUT- A + SLRNF2 OUT+ 49 + OUT- OUT- + SLED POWER SUPPLY UNIT SL2 OUT-A2 0.01 OUT+ 50 VCC SL1 OUT-A1 AVM OUT+ FC OUT-A3 OUT- TK OUT-A4 OUT+ LD OUT-A5 OUT- VINFC VINTK OUT+ DVCC 32 31 30 VINSL2 VINSL1 IQVC 53 52 51 44 43 42 41 40 39 38 33 29 28 47k LEVEL SHIFT PRE LOGIC 117.5k - TSD 47k 67k LIMIT - FF OSC + LIMIT Current LIMIT OSC Polarity COMP REVERSE DETECT FG - FF 117.5k + 47k PRE LOGIC + 47k LEVEL SHIFT + - 67k LEVEL SHIFT 188k + - + - 75k PRE LOGIC 47k 112.5k FG STBY/ BRAKE CONTROL HALL BIAS 1 IU+ 2 A 3 IV+ + HU+ 4 A 5 IW+ + HV+ 7 6 8 9 10 11 12 13 14 15 16 17 2 SW-SP 18 19 20 21 A + + + 24 25 26 27 IHB A IV- 23 A HW+ + IU- 22 A IW- + VSPRNF H- VFG V V 100k CTL1 CTL2 VINSP VINLD VC DVCC 1 SPRNF SPVM U V W OUTSP Fig.1 8/17 BD7905BFS Optical disc ICs SW-SL SLVDD SLRNF1 SLRNF2 SLED POWER SUPPLY SW-SL VSLRNF1 V V VSLRNF2 SLRNF2 SLRNF1 SLVM V 47H OUT- OUT+ OUT-A VO SW-RL RL 2 1 2 2 1 SW-IL 1 SW-IL IL IL A3, A4 and A5 require no coil. (47H) OUTSP U V W 2 1 2-V 2-U RLSP 47H SW-RL 2 RLSP 1 SW-RL RLSP 47H 47H 2-W 1 SW-IL IL Fig.2 9/17 BD7905BFS Optical disc ICs !Table of measure circuit switches position 1 (VCC=SPVM=SLVM=12V, DVCC=AVM=5V, VC=1.65V, RL (SL) =8+47H, RL (SP) =2+47H, RL (ACT, LD) =8, SLRNF=0.5, SPRNF=0.22, H-=2.5V, HU+=2.6V, HV+=HW+=2.4V) INPUT Designation CTL SWITCH Measure point Conditions RL SP SL IL 1 1 1 1 IQVC L 1 1 1 1 IQVC H 1 1 1 1 IQDV L 1 1 1 1 IQVC L 1 1 1 1 IQDV H H 2 1 1 1 1 Check VSLRNF with no output at VIN=VC5mV Check VSLRNF with output at VIN=VC55mV VSLRNF H H 2 1 1 1 See bellow VSLRNF 2 2 ILSL=500mA 1 2 2 ILSL=-500mA 2 1 1 1 VSLRNF 2 1 1 1 VOSL+ VIN 1 2 IQ1 - L H IQ2 - H IQ3 - L IST1 - L IST2 - L *1 gmSL *2 RONUSL 3.3V (0V) H H 1 1 RONLSL 0V (3.3V) H H 1 ILIMSL 3.3V (0V) H H fosc 1.45 H H Circuit current Sled driver block VDZSL lop VRNF4/RNF 12V - VOSL + (-) RON= 0.5A RON= OUT+ (-) VOSL + (-) 0.5A OUT+ (-) Iosp Iosl VRNF1/RNF Iop VRNF3/RNF VRNF2/RNF Iosp or Iosl SPRNF=0.22 SLRNF=0.5 VIN VIN4 VIN3 VIN2 VIN1 Time Iop...the peak current of Iosp or Iosl Dead zone 2 Sled driver VIN1=230mV, VIN2=130mV VIN3=-130mV, VIN4=-230mV VSLRNF1 - VSLRNF2 ) / 0.5 230mV - 130mV VSLRNF4 - VSLRNF3 gm (-) = ( ) / 0.5 230mV - 130mV gm (+) = ( 4 Spindle driver VIN1=300mV (gm1), 600mV (gm2) VIN2=100mV (gm1), 300mV (gm2) VIN3=-300mV (gm2), VIN4=-600mV (gm2) VSPRNF1 - VSPRNF2 ) / 0.22 300mV - 100mV VSPRNF1 - VSPRNF2 gm2 (+) = ( ) / 0.22 600mV - 300mV VSPRNF4 - VSPRNF3 gm2 (-) = ( ) / 0.22 600mV - 300mV gm1 (+) = ( 10/17 BD7905BFS Optical disc ICs !Table of measure circuit switches position 2 (VCC=SPVM=SLVM=12V, DVCC=AVM=5V, VC=1.65V, RL (SL) =8+47H, RL (SP) =2+47H, RL (ACT, LD) =8, SLRNF=0.5, SPRNF=0.22, H-=2.5V, HU+=2.6V, HV+=HW+=2.4V) Designation INPUT VIN CTL SWITCH Measure point Conditions RL SP SL IL 1 1 1 1 IHB=10mA H 1 1 1 1 Current flowing in each terminal at H-=2.5V, H+=2.6V (2.4V) H 2 1 1 1 3 Check VRNF with no output at VIN=VC Check VRNF with output at VIN=VC+40mV VSPRNF VSPRNF VSPRNF 1 2 H H H H Spindle driver block Hall bias VHB 1.65V Pin 7 Hall amplifier IHIB 1.65V IU+ (-), IV+ (-), IW+ (-) Torque command VDZSP1 3 VDZSP2 3 L H 2 1 1 1 3 Check VRNF with no output at VIN=VC Check VRNF with output at VIN=VC120mV gmSP1 4 H H 2 1 1 1 See 10 of 17 gmSP2 4 L H 2 1 1 1 See 10 of 17 RON = 12V - VOSP 0.5A OUTU, V, W RON = VOSP 0.5A OUTU, V, W VSPRNF RONUSP 3.3V H H 1 2 1 2 ILSP=500mA RONLSP 3.3V H H 1 2 1 2 ILSP=-500mA ILIMSP1, 2 3.3V H H 2 1 1 1 VSPRNF ILIMSP1, 2 3.3V L H 2 1 1 1 VSPRNF fosc 1.85 H H 2 1 1 1 VOSPU VFGH 1.65V H H 1 1 1 1 HU+=2.6V, HV+=2.4V, HW+=2.4V VFG VFGL 1.65V H H 1 1 1 1 HU+=2.6V, HV+=2.4V, HW+=2.6V VFG FG 5 Condition of input HU+ HV+ HW+ U V W Condition Measure point 2.4V 2.6V 2.6V Source Middle Sink IOSPU=500mA VOSPU 2.6V 2.4V 2.6V Sink Source Middle IOSPV=500mA VOSPV 2.6V 2.6V 2.4V Middle Sink Source IOSPW=500mA VOSPW 2.6V 2.4V 2.4V Sink Middle Source IOSPU=-500mA VOSPU 2.4V 2.6V 2.4V Source Sink Middle IOSPV=-500mA VOSPV 2.4V 2.4V 2.6V Middle Source Sink IOSPW=-500mA VOSPW 11/17 BD7905BFS Optical disc ICs !Table of measure circuit switches position 3 (VCC=SPVM=SLVM=12V, DVCC=AVM=5V, VC=1.65V, RL (SL) =8+47H, RL (SP) =2+47H, RL (ACT, LD) =8, SLRNF=0.5, SPRNF=0.22, H-=2.5V, HU+=2.6V, HV+=HW+=2.4V) Designation INPUT VIN CTL 1 2 SWITCH RL SP SL Measure point Conditions IL Actuator driver block VOFFT 1.65V H H 2 1 1 1 VOHFT 3.3V (0V) H H 1 1 1 2 IL=500mA 5-OUT+ (-) VOLFT 0V (3.3V) H H 1 1 1 2 IL=-500mA OUT+ (-) GVFT 0.25V H H 2 1 1 1 20log |(VO - VOFFT) / 0.25)| VO VO Loading driver block VOFLD 1.65V H L 2 1 1 1 VOHLD 3.3V (0V) H L 1 1 1 2 IL=500mA 12-OUT+ (-) VOLLD 0V (3.3V) H L 1 1 1 2 IL=-500mA OUT+ (-) GVLD 0.25V H L 2 1 1 1 20log |(VO - VOFFT) / 0.25)| VO VO CTL1, CTL2 VIH 1.65V L L 2 1 1 1 Check active at "H"=2.0 IQVC VIL 1.65V H H 2 1 1 1 Check stand-by at "L"=0.5 IQVC VMVC 1.65V H H 1 1 1 1 Check all output at VC=0.7V OUTPUT VMVCC 1.65V H H 1 1 1 1 Check all output at VCC=3.8V OUTPUT CTL1, CTL2 !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) L L 1) H L 2) - H CTL1 (Pin22) CTL2 (Pin23) input output gain (spindle driver) SPIN > VC SPIN < VC L H 245mArms/V (Typ.) Forward-rotation mode Reverse-rotation braking mode 3) H H 1.5Arms/V (Typ.) Forward-rotation mode Short-circuit braking mode 4) Spindle Sled Focus Tracking Loading ... ON ... OFF 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. 12/17 BD7905BFS Optical disc ICs 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. 2. Input/output timing chart HU+ HU- FWD HV+ HV- HW+ HW- INSP VC FWD REV FWD ) Reverse protect ) Forward rotation torque SOURCE U MID SINK SOURCE V MID SINK SOURCE W MID SINK A B C D E F ) Forward rotation mode G H I J K L ) Reverse rotation brake 13/17 BD7905BFS Optical disc ICs 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 100mVPP. VCC VCC HU HU HV HV HW HW 7pin 7pin 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: SPRNF SLRNF FWD rotation Dead zone + Dead zone - SPIN SLIN1, 2 VC 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. Gain expression Spindle (CTL1="H") Spindle (CTL1="L") Sled Input-output gain 0.33/RNF (Arms/V) 53.9/RNF (mArms/V) 0.65/RNF (A/V) Output-limit current 0.33/RNF (A) 96.8/RNF (mA) 0.5/RNF (A) Gain with the added resistor 0.33x112.5k /{SPRNFx(Rin+112.5k)} (Arms/V) 53.9x112.5k /{SPRNFx(Rin+112.5k)} (mArms/V) 0.65x47k/ {SLRNFx(Rin+47k)} (A/V) 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.). 14/17 BD7905BFS Optical disc ICs 6. Muting functions a) VC-drop muting When the voltage at VC terminal (pin 27) 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) VCC-drop muting When the voltages at DVCC terminal (pin 54) and VCC 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 175C (Typ.) (the outputs of all the channels are turned off). When the junction temperature drops to 150C (Typ.), the IC start operating again. !Application example TRACKING 53 52 51 STM SLVM=12V SLED SLED IN2 IN1 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 SLRNF1 AVM=5V SLED2 M SLRNF2 LOADING VCC=12V 54 FOCUS SLED1 DVCC=5V TRACKING FOCUS IN IN 31 30 29 28 47k PRE LOGIC 117.5k - TSD 47k 67k LIMIT - FF OSC + LIMIT Current LIMIT OSC FG - FF 117.5k + 47k PRE LOGIC Polarity COMP REVERSE DETECT + 47k LEVEL SHIFT LEVEL SHIFT + - 67k LEVEL SHIFT 188k + - + - 75k PRE LOGIC 47k 112.5k FG STBY/ BRAKE CONTROL HALL BIAS 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 HALL3 HALL2 HALL1 FG -COM SPINDLE 5V -COM SPINDLE IN VC LOADING IN SPRNF SPVM=12V Fig.3 15/17 BD7905BFS Optical disc ICs !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 VCC (pin 51) is used by the spindle and that applied to SLVDD (pin 30) by the sled. For this reason, be sure to apply VCC (pin 51) to the spindle and SLVDD (pin 30) to the sled according to the corresponding power supply voltages to prevent voltage differences. (3) Filtering capacitor It is recommended to connect 0.01F 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 (0.1F) 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. POWER DISSIPATION : Pd (W) !Electrical characteristic curves 3 2.6W 2 1 0 0 25 50 75 100 125 150 AMBIENT TEMPERATURE : Ta (C) On less than 25.7% (percentage occupied by copper foil), 70x70mm2, t=1.6mm glass epoxy mounting. Fig.4 Power dissipation 16/17 BD7905BFS Optical disc ICs !External dimensions (Units : mm) 22.00.2 28 27 0.150.1 6.00.2 0.1 2.20.1 1 0.3Min. 4.00.2 13.40.3 11.40.2 54 0.8 0.360.1 0.1 SSOP-A54 17/17 Appendix 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. 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. 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. Appendix1-Rev1.0