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Part: BD7903FS
Category:
Optoelectronics
-> Drivers/Controllers
-> Optical Drivers
Description:
Company: ROHM Electronics
Datasheet: Download BD7903FS datasheet File size : 130 kB
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Datasheet text preview:
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.
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BD7903FS
Optical disc ICs
!Absolute maximum ratings (Ta=25°C)
Parameter POWER MOS power suuply voltage Preblock/BTL powerblock power supply voltage Spindle control block power supply voltage Power dissipation Operating temperature range Storage temperature Symbol SPVM1,2 PreVCC, VMACT SPVCC Pd Topr Tstg Limits 15 15 7 2.61 -35 to +85 -55 to +150 Unit V V V W °C °C
1 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 POWER MOS Power supply voltage1 Preblock Power supply voltage Power block Power supply voltage Spindle control block Power supply voltage Symbol SPVM1, 2 PreVCC VMACT SPVCC Min. SPVCC VMACT 4.5 4.5 Typ. 12 12 5.0 5.0 Max. 14 14 PreVCC 6.0 Unit V V V V
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54
1
- +
SPVCC
FG
SPVCC SL IN OPOUT CTL2 PreVCC CTL1 SLO+
53
2 52 VM 3 51 4 50 5
10k
3FG HALL OUT BIAS
HB SPVM1 HU-
PreVCC
!Block diagram
Optical disc ICs
HU+
BREAK MODE STAND-BY CONTROL
49
6
SPGND
CURRENT DETECTOR 60k
-
HV+
HALL AMP/REVERCE PROTECT
HW-
HW+
V
15k
PowGND
10k
GND
GND
MATRIX
DUTY CONTROL
GND
GND
GND
PreGND
SPGND
W
SPRNF
SPIN LDIN CFCerr2 CFCerr1 VINFC SPVM2 VINTX VC
30k
+
+
7.5k
-
20k 10k
- +
+
+
+
25
10k
30
20k
-
7.5k
-
BD7903FS
7.5k
+
U
-
7.5k
-
HV-
+
25k
48
7
LEVEL SHIFT
47
8 9
LEVEL SHIFT
SLO-
46
LDO+
10 11 12 13 14 15 16 17 18
-
45 44 43 42
LDO- PowGND GND GND
TSD
41 40 39 38 37
GND GND GND PreGND VOFC-
19 20 21 22 23 24 26 VC 27
36 35 34 33
VOFC+ VOTK- VOTK+
×2 VMACT ×2
VNFTK
32 31 29 28
VMACT VNFFC CFIL CTKerr2 CTKerr1
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BD7903FS
Optical disc ICs
!Pin descriptions
Pin No. 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 Pin name FG HB SPVM1 HU- HU+ HV- HV+ HW- HW+ V U GND GND GND GND GND SPGND W SPRNF SPIN LDIN CFCerr2 CFCerr1 VINFC SPVM2 VINTK VC Function Frequency generator output Hall bias Spindle driver power supply 1 Hall amp.U negative input Hall amp.U positive input Hall amp.V negative input Hall amp.V positive input Hall amp.W negative input Hall amp.W positive input Spindle driver output V Spindle driver output U GND GND GND GND GND Spindle driver power ground Spindle driver output W Spindle driver current sense Spindle driver input Loading driver input Connection with capacitor for error amplifier Connection with capacitor for error amplifier Focus driver input Spindle driver power supply 2 Tracking driver input Reference voltage input Pin No. 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 Pin name CTKerr1 CTKerr2 CFIL VNFFC VMACT VNFTK VOTK+ VOTK- VOFC+ VOFC- PreGND GND GND GND GND GND PowGND LDO- LDO+ SLO1- SLO1+ CTL1 PreVCC CTL2 OPOUT SLIN SPVCC Function Connection with capacitor for error amplifier Connection with capacitor for error amplifier Connection with capacitor for spindle loop Feedback for focus driver Actuator driver block power supply Feedback for tracking driver Tracking driver positive output Tracking driver negative output Focus driver positive output Focus driver negative output Pre-ground GND GND GND GND GND BTL block power ground Loading driver negative output Loading driver positive output Slide drive negative output Slide drive positive output Driver logic control input 1 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.
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BD7903FS
Optical disc ICs
!Input output circuit
Three-phase motor driver output
25 3
Spindle driver current detection input
Hall bias
50pin
50pin
2.5k
18 W U 11 V 10 19
2
17
Hall signal input
54pin 54pin 54pin
Spindle driver feedback filter pin
FG signal output
54pin
5 7 9
54pin
50k
50k
4 6 8 30
10k
100
21
5.4k
5k
10k
current feedback BTL driver output FO, TK
32pin
BTL driver output SL, LD
PWM driver input Spindle
54pin
50pin 50pin 50pin 54pin
34 36 10k 35 37 46 48 45 47 20
60k 20k VREF
current feedback BTL driver input FO, TK
50pin
BTL driver input LD
BTL driver input SL
50pin
50pin
50pin
50pin
50pin
24 26
21
53
10k
10k
100
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