BD7903FS Optical disc ICs 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. 1/16 BD7903FS Optical disc ICs !Absolute maximum ratings (Ta=25C) Parameter Symbol Limits Unit SPVM1,2 15 V PreVCC, VMACT 15 V SPVCC 7 V POWER MOS power suuply voltage Preblock/BTL powerblock power supply voltage Spindle control block power supply voltage Pd 2.61 W Operating temperature range Topr -35 to +85 C Storage temperature Tstg -55 to +150 C Power dissipation 1 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) Symbol Min. Typ. Max. Unit POWER MOS Power supply voltage1 Parameter SPVM1, 2 SPVCC 12 14 V Preblock Power supply voltage PreVCC VMACT 12 14 V Power block Power supply voltage VMACT 4.5 5.0 PreVCC V Spindle control block Power supply voltage SPVCC 4.5 5.0 6.0 V 2/16 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 HV- HV+ HW- HW+ V U GND GND GND GND GND SPGND W SPRNF SPIN LDIN CFCerr2 CFCerr1 GND GND GND PreGND VOFC- VOFC+ VOTK- VOTK+ VNFTK VMACT 41 40 39 38 37 36 35 34 33 32 HALL AMP/REVERCE PROTECT - - VM MATRIX - + CTKerr1 GND 42 + - + - + - 7.5k GND 43 CTKerr2 PowGND 44 VNFFC LDO- 45 CFIL LDO+ 46 20k 10k 7.5k SLO- 47 x2 SLO+ 48 7.5k LEVEL SHIFT VMACT CTL1 49 10k DUTY CONTROL 20k PreVCC x2 PreVCC 50 10k 25k 7.5k PowGND 30k LEVEL SHIFT CURRENT DETECTOR 10k - SPVCC 60k 3FG HALL OUT BIAS SPGND + CTL2 51 24 25 26 27 VC 5 HU+ BREAK MODE STAND-BY CONTROL OPOUT 52 VINTX 4 HU- SLIN 53 VINFC 3 SPVM1 SPVCC 54 SPVM2 2 HB + - + - 1 FG BD7903FS Optical disc ICs !Block diagram 31 30 29 28 PreGND TSD 15k + + VC 3/16 BD7903FS Optical disc ICs !Pin descriptions Pin No. Pin name Pin No. Pin name 1 FG Frequency generator output Function 28 CTKerr1 Connection with capacitor for error amplifier Function 2 HB Hall bias 29 CTKerr2 Connection with capacitor for error amplifier 3 SPVM1 Spindle driver power supply 1 30 CFIL 4 HU- Hall amp.U negative input 31 VNFFC Feedback for focus driver 5 HU+ Hall amp.U positive input 32 VMACT Actuator driver block power supply 6 HV- Hall amp.V negative input 33 VNFTK Feedback for tracking driver 7 HV+ Hall amp.V positive input 34 VOTK+ Tracking driver positive output 8 HW- Hall amp.W negative input 35 VOTK- Tracking driver negative output 9 HW+ Hall amp.W positive input 36 VOFC+ Focus driver positive output 10 V Spindle driver output V 37 VOFC- Focus driver negative output 11 U Spindle driver output U 38 PreGND Pre-ground 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 SPGND Spindle driver power ground 44 PowGND 18 W Spindle driver output W 45 LDO- Loading driver negative output 19 SPRNF Spindle driver current sense 46 LDO+ Loading driver positive output 20 SPIN Spindle driver input 47 SLO1- Slide drive negative output 21 LDIN Loading driver input 48 SLO1+ Slide drive positive output 22 CFCerr2 Connection with capacitor for error amplifier 49 CTL1 Driver logic control input 1 23 CFCerr1 Connection with capacitor for error amplifier 50 PreVCC 24 VINFC Focus driver input 51 CTL2 25 SPVM2 Spindle driver power supply 2 52 OPOUT 26 VINTK Tracking driver input 53 SLIN 27 VC Reference voltage input 54 SPVCC Connection with capacitor for spindle loop BTL block power ground 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. 4/16 BD7903FS Optical disc ICs !Input output circuit Spindle driver current detection input Three-phase motor driver output 25 Hall bias 3 50pin 50pin 2.5k W 18 U V 11 2 19 10 17 Spindle driver feedback filter pin Hall signal input 54pin 54pin FG signal output 54pin 54pin 54pin 5 50k 4 50k 7 6 9 8 10k 100 21 30 10k 5.4k current feedback BTL driver output FO, TK 5k BTL driver output SL, LD PWM driver input Spindle 32pin 54pin 50pin 50pin 50pin 54pin 34 35 36 10k 37 46 45 48 47 20 60k 20k VREF current feedback BTL driver input FO, TK BTL driver input LD 50pin 50pin 50pin 24 26 50pin 50pin 21 10k BTL driver input SL 50pin 53 10k 100 5/16 BD7903FS Optical disc ICs Feedback for FC, TK / Connection with capacitor for error amplifier 1 OP Amp output 50pin 50pin 50pin 50pin 50pin 50pin 20k 7.5k 21 23 10k 31 7.5k 10k 33 28 Control signal input Connection with capacitor for error amp 2 10k 51pin 50pin 50k 22 49 29 51 50k Reference voltage input 50pin 60k 10k 50k 27 100 10k 50k x4ch 6/16 BD7903FS Optical disc ICs !Electrical characteristics (unless otherwise noted, Ta=25C, PreVCC=SPVM1/2=12V, SPVCC=VMACT=5V, VC=1.65V, RNF=0.33, Pd=0.5) Parameter Symbol Min. Typ. Max. Unit Conditions Circuit Quiescent current 1 IQ1 - 26 40 mA VCC (Loading OFF) Fig.1, 2 Quiescent current 2 IQ2 - 20 32 mA VCC (Loading ON) Fig.1, 2 Quiescent current 3 IQ3 - 2.9 4.5 mA SPVCC Fig.1, 2 Standby-on current 1 IST1 - - 1 mA VCC Fig.1, 2 Standby-on current 2 IST2 - - 1 mA SPVCC Fig.1, 2 VHB 0.5 1.0 1.5 V IHB=10mA Fig.1, 2 Curcuit current Spindle driver block Hall bias Hall bias voltage Spindle driver block Hall amplifier Fig.1, 2 Input bias current IHIB - 1 5 A Fig.1, 2 Input level VHIM 50 200 - mV Fig.1, 2 Common mode input range VHICM 1 ~ 4 V Fig.1, 2 Fig.1, 2 Spindle driver block Torque control Input dead zone (one side) VDZSP 20 50 100 mV Input output gain gmSP 1.2 1.5 1.8 Arms/V RNF=0.33 Fig.1, 2 Output ON resistor (Upper) VOHSP - 0.6 1.0 Io=500mA Fig.1, 2 Output ON resistor (lower) VOMSP - 0.25 0.5 IL=-500mA Fig.1, 2 Output limit current ILIMSP 1.5 1.8 2.0 A RNF=0.33 Fig.1, 2 PWM frequency fosc - 100 - kHz High voltage VFGH 4.7 4.9 - V Low voltage VFGL - 0.1 0.2 V VICMOP 0.3 ~ 11 V Fig.1, 2 Fig.1, 2 Spindle driver block FG output Connect 100k between FG and 5V Fig.1, 2 Fig.1, 2 Slide driver block Pre OP AMP Input range IBOP - 80 300 nA Fig.1, 2 Low level output voltage VOLOP - 0.1 0.5 V Fig.1, 2 Max output source current ISOOP - - 0.3 mA Fig.1, 2 IISIOP - - 1 mA Fig.1, 2 Output offset voltage VOOFSL -100 0 100 mV Output saturation voltage "H" VOMSL - 1.3 1.6 V Io=500mA Fig.1, 2 Output saturation voltage "L" VOLSL - 0.5 0.85 V Io=500mA Fig.1, 2 Voltage gain GVSL 18.0 20.0 22.0 dB The gain of pre-OP AMP is 0dB Fig.1, 2 Output offset current IOO -8 0 8 mA RL=8 Fig.1, 2 Max output voltage amplitude VOM 3.6 4.0 - V RL=8 Fig.1, 2 Trans conductance Gm 1.4 1.7 2.0 A/V VIN=BIAS0.2V Fig.1, 2 Input bias current Max output sink current Slide driver block Fig.1, 2 Actuator driver block This product is not designed for protection against radioactive rays. 7/16 BD7903FS Optical disc ICs Parameter Symbol Min. Typ. Max. Unit Output offset voltage VOFLD -70 Output saturation voltage "H" VOHLD - Output saturation voltage "L" VOLLD - 0.5 Voltage gain GVLD 13.5 15.5 Input high voltage VIH 2.0 Input low voltage VIL - VMVC VCC drop-muting ON voltage VCC drop-muting OFF voltage VHYVCC Conditions Circuit 0 70 mV 1.3 1.6 V Io=500mA Fig.1, 2 0.85 V Io=500mA Fig.1, 2 17.5 dB Fig.1, 2 - - V Fig.1, 2 - 0.5 V Fig.1, 2 0.5 0.7 1.0 V Fig.1, 2 VMVCC ON 3.85 4.00 - V Fig.1, 2 VMVCC OFF - 4.25 4.40 V Fig.1, 2 100 - - mV Fig.1, 2 Loading driver block Fig.1, 2 CTL1, CTL2 Others VC drop-muting VCC drop-muting hysteresis width This product is not designed for protection against radioactive rays. 8/16 BD7903FS Optical disc ICs !Measurement circuits + ACT.OUT OUT+ VMACT 2 OUT+ NF OUT- V TRACKING NF + OUT- VOOP 1 49 45 44 43 41 40 39 PowGND 37 35 34 33 LEVEL SHIFT 32 LEVEL SHIFT + VFILTK VEOTK + - - IV- A A + + HU+ IV+ A + IW- A + HV+ 2 IW+ A VSPRNF + V 1 18 19 20 21 22 23 24 25 26 27 VC 17 VINTK 16 VMSP 15 VINFC 14 VFILFC 13 VEOFC 12 VLDIN 11 VSPIN 10 VDET 9 VOW 8 VSPGND 7 VOU 6 + 10k + 10k 7.5k - 20k 20k + - VC SW-SP IU+ + IHB + SPGND IU- A 100k 5 VOV 4 VMSP VMB V 30k MATRIX 3FG HALL OUT BIAS 3 28 + 60k CURRENT DETECTOR HALL AMP/REVERCE PROTECT VM VFG 29 7.5k + - - - 7.5k - 7.5k 10k DUTY CONTROL 2 30 15k 25k 10k 1 31 TSD BREAK MODE STAND-BY CONTROL - 0.1 100p PreGND PreVCC + VMACT VNFTK VOTKP VOTKM VOFCP 36 x2 SPVCC 38 + A VCNF IQAC 42 VOFCM PREGND OUT- OUT+ 46 IOP VPOWGND 47 VOLDM OUT- 48 10k x2 50 10k SLIN VMACT 51 VOSLM A VOSLP 52 + VVCC 53 OUT+ CTL1 IQVC 54 VOPOSL A VOPINSL IQDV CTL2 + LOADING VOL.OUT VOLDP SLED VOL.OUT DVCC VNFFC SW-OP OPOUT OPIN VCC FOCUS ACT.OUT OPOUT V OPIN VOFOP SPIN LDIN VC 100p SPRNF HW+ ACIN ACIN VCC DVCC VCC H- V U W SPOUT Fig.1 9/16 BD7903FS Optical disc ICs + OUT- OUT+ VOL.OUT VO V 1 RL1 SW-RL 2 47H 2 2 1 1 SW-IL SW-IL SW-RL IL ACT.OUT 2 OUT- NF OUT+ IL SW-RL 2 1 1 1 1 Rd 2 SW-IL 2 SW-IL VO IL + V IL RL 47H SPOUT U V W 2 47H RLsp 2 47H RLsp 2 47H RLsp 1 1 2-V 1 SW-RL 2-W 2-U 1 SW-IL ILSP Fig.2 10/16 BD7903FS Optical disc ICs !Table of measure circuit switches position 1 (VCC=SPVM=12V, DVCC=VMACT=5V, VC=1.65V, RL (act) =8, RL (SL) =8+47H, RL (SP) =2+47H, Pd=0.5, SPRNF=0.33, H-=2.5V, HU+=2.6V, HV+=HW+=2.4V) Designation INPUT VIN CTL 1 2 SWITCH RL SP SL IL OP Conditions Measure point Circuit current IQ1 - L H 1 1 1 1 1 IQVC IQ2 - H L 1 1 1 1 1 IQVC IQ3 - L H 1 1 1 1 1 IQDV IST1 - L L 1 1 1 1 1 IQVC IST2 - L L 1 1 1 1 1 IQDV H H 1 1 1 1 1 IHB=10mA H H 1 1 1 1 1 Current flowing in each terminal at H-=2.5V, H+=2.7V (2.3V) IU+ (-), IV+ (-), IW+ (-) 1 Check VRNF with no output at VIN=VC20mV Check VRNF with output at VIN=VC100mV VSPRNF Spindle driver block Hall bias VHB 1.65V Pin 2 Hall amplifier IHIB 1.65V Torque command VDZSP 1 L H 2 1 1 1 1 gmSP 2 L H 2 1 1 1 1 VSPRNF RON = 12V - VOSP 0.5A OUTU, V, W RON = VOSP 0.5A OUTU, V, W RONUSP 0V H H 1 2 1 2 1 ILSP=500mA RONLSP 0V H H 1 2 1 2 1 ILSP=-500mA ILIMSP 0V H H 2 1 1 1 1 VSPRNF fosc 0.65 H H 2 1 1 1 1 VOSPU VFGH 1.65V H H 1 1 1 1 1 HW+=2.6V, HV+=2.4V, HW+=2.4V VFG VFGL 1.65V H H 1 1 1 1 1 HW+=2.6V, HV+=2.6V, HW+=2.4V VFG FG 2 Spindle driver VIN=-400mV, VIN=-900mV gm (+) =( VSPRNF1 - VSPRNF2 )/0.33 900mV - 400mV 11/16 BD7903FS Optical disc ICs !Table of measure circuit switches position 2 (VCC=SPVM=12V, DVCC=VMACT=5V, VC=1.65V, RL (act) =8, RL (SL) =8+47H, RL (SP) =2+47H, Pd=0.5, SPRNF=0.33, H-=2.5V, HU+=2.6V, HV+=HW+=2.4V) Designation INPUT VIN CTL 1 2 SWITCH RL SP SL Conditions IL OP Measure point Actuator driver block IOOAC 1.65V H H 2 1 1 1 1 VOMAC 3.3V (0V) H H 2 1 1 1 1 GMAC 0.20V H H 2 1 1 1 1 IOOAC=VO/8 VO VO (VO - IOOACx8) / 0.2x8 VO Slide driver block VOFSL 1.65V L H 2 1 1 1 1 VOHSL 3.3V (0V) L H 1 1 1 2 1 IL=500mA 12-OUT+ (-) VOLSL 0V (3.3V) L H 1 1 1 2 1 IL=-500mA OUT+ (-) GVSL 0.25V L H 2 1 1 1 1 20log|(VO - VOFSL) / 0.25)| VO VO Loading driver block VOFLD 1.65V H L 2 1 1 1 1 VOHLD 3.3V (0V) H L 1 1 1 2 1 IL=500mA 12-OUT+ (-) VOLLD 0V (3.3V) H L 1 1 1 2 1 IL=-500mA OUT+ (-) GVLD 0.25V H L 2 1 1 1 1 20log |(VO - VOFLD) / 0.25)| VO VO Pre-operational amplifier block IBOP 1.65V H H 1 1 1 1 2 IOSOOP - H H 1 1 1 1 2 IOP=500A IOSIOP - H H 1 1 1 1 2 IOP=-1mA VOLOP 5V H H 1 1 1 1 1 VIH 1.65V L L 2 1 1 1 1 Check active at "H"=2.0 IQVC VIL 1.65V H H 2 1 1 1 1 Check stand-by at "L"=0.5 IQVC IOPB VOF VOF VOOP CTL1, CTL2 Others VMVC 1.65V H H 1 1 1 1 1 Check all output at VC=0.5V OUTPUT VMVCCON 1.65V H H 1 1 1 1 1 Check all output at VCC=4.0V OUTPUT VMVCCOFF 1.65V H H 1 1 1 1 1 Check all output at VCC=4.4V OUTPUT 12/16 BD7903FS Optical disc ICs !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) L L 1) H L 2) - H CTL1 (Pin22) CTL2 (Pin23) L H Spindle Slide Focus Tracking Loading ... ON ... OFF SPIN < VC SPIN > VC H Forward-rotation mode Reverse-rotation braking mode 3) H Forward-rotation mode Short-circuit braking mode 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 > 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. 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. VCC VCC HU HU HV HW HV HW Pin2 Parallel connection Pin2 Series connection 13/16 BD7903FS Optical disc ICs 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: SPRNF FWD rotation Dead zone + Dead zone - SPIN 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 motor can be decreased by connecting a resistor in series to each input terminal. Gain expression (typ.) Spindle Input-output gain 0.5/RNF (Arms/V) Output-limit current 0.6/RNF (A/V) Gain with the added resistor 29.7k/{RNFx(Rin+60k)} (Arms/V) Rin : added series resistor 4. PWM oscillation frequency The PWM oscillation for driving the spindle is free running. The oscillating frequency is 100kHz (typ.). 5. 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 high-impedance. Set the VC terminal voltage to larger than 1.0V. b) VCC-drop muting When the voltages at DVCC terminal (pin 54) or VCC 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 175C (typ.) (the outputs of all the channels are turned off). When the junction temperature drops to 150C (typ.), the IC start operating again. 14/16 BD7903FS Optical disc ICs 48 49 46 45 44 43 42 41 40 39 PowGND 37 36 VMACT =5V Rd TRACKING 35 0.1 34 LEVEL SHIFT LEVEL SHIFT 29 + + + - 20k + 7.5k - - + - 5 7 6 8 9 HALL3 HALL2 HALL1 100k FG 10 11 12 13 14 15 16 17 18 19 SPINDLE 4 + VC SPGND 3FG HALL OUT BIAS 30k MATRIX 60k CURRENT DETECTOR HALL AMP/REVERCE PROTECT + + 10k - - - VM 3 28 7.5k - 7.5k 10k DUTY CONTROL 2 30 15k 25k 10k 1 31 TSD BREAK MODE STAND-BY CONTROL + 32 PreGND PreVCC - 33 x2 SPVCC 38 Rd FOCUS LOADING 47 7.5k 50 20k 51 x2 52 0.1 VMACT 53 M 10k 54 M SLIDE VCC 0.1 0.1 -COM -COM SLIDE IN OPOUT SPVCC =5V PreVCC =12V !Application example 20 21 LOADING INPUT SPINDLE INPUT 22 23 24 25 26 27 VC FOCUS INPUT TRACKING INPUT 0.33 0.1 VCC Fig.3 !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. This range of wiring is considered as detection rasistor. Please wire as wide and short as possible. 12V close to IC RNF 50 3 VM 25 VM 19 SPRNF PreVCC close to RNF 15/16 BD7903FS Optical disc ICs (2) Filtering capacitor It is recommended to connect 0.1F 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 (0.1F) across the supply voltage lines close to the IC pins and please connect large capacity and small ESR capacitor (10F) 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. 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 !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 16/16