BD7903FS Rohm, BD7903FS Datasheet
BD7903FS
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BD7903FS Summary of contents
Page 1
... 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 ...
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... Spindle control block SPV CC Power supply voltage Symbol Limits SPV 1 ACT CC M SPV 7 CC 2.6 ∗ −35 to +85 Topr −55 to +150 Tstg Min. Typ. Max. SPV ACT 4.5 5.0 PreV CC 4.5 5.0 6.0 BD7903FS Unit °C °C Unit 2/16 ...
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... OUT BIAS PowGND PreGND LEVEL SHIFT TSD 15k 10k DUTY CONTROL MATRIX BD7903FS − + − + − + − − − 3/16 ...
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... Slide drive negative output 48 SLO1+ Slide drive positive output 49 CTL1 Driver logic control input 1 50 PreV Loading block power supply CC 51 CTL2 Driver logic control input 2 52 OPOUT OP amp output 53 SLIN Slide driver input 54 SPV Spindle block control power supply CC BD7903FS 4/16 ...
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... BTL driver output SL, LD 50pin 50pin 50pin BTL driver input LD 50pin 50pin 21 10kΩ BD7903FS Hall bias 50pin 2 FG signal output 54pin 100Ω 21 PWM driver input Spindle 54pin 54pin 20 60kΩ BTL driver input SL 50pin 50pin 53 100Ω ...
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... Feedback for FC Connection with capacitor for error amplifier 1 50pin 50pin 20kΩ 31 10kΩ 33 10kΩ 60kΩ 50kΩ 50kΩ ×4ch BD7903FS 50pin 50pin 7.5kΩ 23 7.5kΩ 28 Control signal input 50pin 50kΩ 50kΩ 6/16 ...
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... V − 0.5 0.85 V 18.0 20.0 22.0 dB − − 3.6 4.0 V 1.4 1.7 2.0 A/V BD7903FS =1.65V, RNF=0.33Ω, Pd=0.5Ω) C Conditions Circuit V (Loading OFF) Fig. (Loading ON) Fig. SPV Fig. Fig. SPV Fig. IHB=10mA Fig.1, 2 Fig.1, 2 Fig.1, 2 Fig.1, 2 Fig.1, 2 Fig.1, 2 RNF=0.33Ω Fig.1, 2 Io=500mA Fig ...
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... This product is not designed for protection against radioactive rays. Min. Typ. Max. − − 1.3 1.6 − 0.5 0.85 13.5 15.5 17.5 − − VIH 2.0 − − VIL 0.5 0.5 0.7 1.0 − ON 3.85 4.00 CC − OFF 4.25 4.40 CC − − 100 CC BD7903FS Unit Conditions mV V Io=500mA V Io=500mA Circuit 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 8/16 ...
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... PreGND LEVEL SHIFT TSD 15k 10k DUTY CONTROL MATRIX IW VSPRNF + SPRNF HW SPOUT Fig.1 BD7903FS FOCUS ACT.OUT TRACKING NF ACT.OUT + − + − + − − ...
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... Optical disc ICs VOL.OUT + SW-RL RL1 2 47µ SW-IL SW- ACT.OUT SW-RL SW- SW- 47µH SPOUT 47µH RLsp 2 1 RLsp 47µ 47µH RLsp 2 2-V 1 SW-RL 2-W 2-U 1 SW-IL ILSP Fig.2 BD7903FS SW- 10/16 ...
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... HW+=2.6V, HV+=2.4V, HW+=2. HW+=2.6V, HV+=2.6V, HW+=2.4V VSPRNF1 − VSPRNF2 gm (+) =( )/0.33Ω 900mV − 400mV BD7903FS Measure point IQVC IQVC IQDV IQVC IQDV Pin 2 IU+ (−), IV+ (−), IW+ (−) VSPRNF VSPRNF 12V − VOSP RON = OUTU 0.5A VOSP RON = OUTU 0.5A VSPRNF ...
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... Check stand-by at "L"=0 Check all output at VC=0. Check all output Check all output at V BD7903FS Measure point 12−OUT+ (−) OUT+ (− 12−OUT+ (−) OUT+ (−) VO IOPB VOF VOF VOOP IQVC ...
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... Hall elements can be connected either in series or in parallel. Set the Hall input voltage to 1.0 to 4.0V Pin2 〈 Parallel connection 〉 〈 Series connection 〉 Slide Focus Tracking SPIN < V SPIN > Reverse-rotation braking mode Short-circuit braking mode . C C (Spindle Pin2 BD7903FS Loading 1) 2) ... ON ... OFF 13/16 ...
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... When the junction temperature drops to 150°C (typ.), the IC start operating again. Dead zone + Dead zone − SPIN Spindle 0.5/RNF (Arms/V) 0.6/RNF (A/V) 29.7k/{RNF×(Rin+60k)} (Arms/V) Rin : added series resistor terminal voltage to larger than 1.0V. C terminal (pin 50) drop to lower than 4.0V (typ.), the outputs of all CC BD7903FS 14/16 ...
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... PowGND PreGND LEVEL SHIFT TSD 15k 10k DUTY CONTROL MATRIX Fig SPRNF BD7903FS 0.1µ − + − + − − LOADING INPUT SPINDLE FOCUS TRACKING INPUT INPUT 0 ...
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... Electrical characteristic curves 3 2. 100 125 150 AMBIENT TEMPERATURE : Ta (°C) ∗ On less than 25.7% (percentage occupied by copper foil), 2 70×70mm , t=1.6mm glass epoxy mounting. Fig.4 Power dissipation ! ! ! ! External dimensions (Units : mm) 22.0±0 6.0±0.2 0.8 0.36±0.1 SSOP-A54 0.15±0.1 0.1 BD7903FS 16/16 ...