BD7903FS
Optical disc ICs
1/16
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=0.85Ω)
〈 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.
BD7903FS
Optical disc ICs
2/16
!
!!
!Absolute maximum ratings (Ta=25°C)
Parameter Symbol Unit
SPVM1,2
PreVCC, VMACT
SPVCC
Pd
Topr
Tstg
Limits
−55 to +150
15
15
7
2.6∗1
−35 to +85
V
V
V
W
°C
°C
POWER MOS
power suuply voltage
Preblock/BTL powerblock
power supply voltage
Spindle control block
power supply voltage
Power dissipation
Operating temperature range
Storage temperature
∗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 Symbol Max.Typ.Min. Unit
POWER MOS
Power supply voltage1 SPV
M
1, 2 1412SPV
CC
V
Preblock
Power supply voltage
Power block
Power supply voltage
PreVCC
PreVCCV
M
ACT
1412V
M
ACT
5.04.5
V
V
Spindle control block
Power supply voltage 6.0SPVCC 5.04.5 V
BD7903FS
Optical disc ICs
3/16
!
!!
!Block diagram
1 14 15 16 17 18 19 20 21 22 23 24 25 26 272 3 109 12 1311
6
457 8
54 41 40 39 38 37 36 35 34 33 32 31 30 29 2853 52 4546 43 4244
49
51 50 48 47
DUTY
CONTROL
CURRENT
DETECTOR
HALL
BIAS
3FG
OUT
LEVEL
SHIFT
BREAK
MODE
STAND-BY
CONTROL
LEVEL
SHIFT
TSD
MATRIX
+
−
+
−
+
−
SPV
CC
FG
HB
SPV
M
1
V
M
HU−
HW+
HW−
HU+
HV−
HV+
V
U
GND
GND
GND
GND
GND
SPGND
SPGND
W
SPRNF
SPIN
LDIN
CFCerr2
CFCerr1
VINFC
SPV
M
2
VINTX
V
C
V
C
SLIN
OPOUT
CTL2
PowGND
PreV
CC
CTL1
LDO+
LDO−
VOFC−
VOFC+
VOTK−
VOTK+
VNFFC
GND
GND
GND
GND
GND
PreGND
SLO+
SLO−
VNFTK
V
M
ACT
CFIL
CTKerr2
CTKerr1
PreV
CC
PowGND PreGND
V
M
ACT
SPV
CC
+
−
+
−
+
−
+
−
7.5k
7.5k
7.5k
60k 30k
10k
15k
+
−
+
−
10k 25k
20k
20k
10k
10k 7.5k
HALL AMP/REVERCE PROTECT
×2
×2
BD7903FS
Optical disc ICs
4/16
!
!!
!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
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
V
C
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. 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
CTKerr1
CTKerr2
CFIL
VNFFC
VMACT
VNFTK
VOTK+
VOTK−
VOFC+
VOFC−
PreGND
GND
GND
GND
GND
GND
PowGND
LDO−
LDO+
SLO1−
SLO1+
CTL1
PreV
CC
CTL2
OPOUT
SLIN
SPV
CC
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.
BD7903FS
Optical disc ICs
5/16
!
!!
!Input output circuit
Three-phase motor driver output
Hall signal input
current feedback
BTL driver output FO, TK
current feedback
BTL driver input FO, TK BTL driver input LD BTL driver input SL
BTL driver output SL, LD PWM driver input Spindle
Spindle driver current detection input
Spindle driver feedback filter pin
Hall bias
FG signal output
46
48 45
47
50pin 50pin
50pin
2
50pin
3
17
25
18 11 10
WU V 19
50pin
2.5kΩ
7
5
9
54pin
50kΩ50kΩ
54pin 54pin
6
4
830
54pin
5.4kΩ5kΩ
10kΩ
10kΩ
21
54pin
100Ω
34
36 35
37
32pin
10kΩ
20kΩ
V
REF
20
54pin
54pin
60kΩ
24
26
50pin
50pin
10kΩ
21
50pin
50pin
10kΩ
53
50pin
50pin
100Ω
BD7903FS
Optical disc ICs
6/16
Connection with capacitor for error amp 2
Feedback for FC, TK /
Connection with capacitor for error amplifier 1
Control signal input
OP Amp output
Reference voltage input
49
51
50pin
50kΩ
50kΩ
21
50pin
50pin
10kΩ31
33
23
28
50pin
50pin 50pin
50pin
10kΩ
20kΩ7.5kΩ
7.5kΩ
22
29
51pin 10kΩ
27
50pin
×4ch
10kΩ
50kΩ
50kΩ
60kΩ
100Ω10kΩ
BD7903FS
Optical disc ICs
7/16
!
!!
!Electrical characteristics
(unless otherwise noted, Ta=25°C, PreVCC=SPVM1/2=12V, SPVCC=VMACT=5V, VC=1.65V, RNF=0.33Ω, Pd=0.5Ω)
Curcuit current
Quiescent current 1
Quiescent current 2
Quiescent current 3
Standby-on current 1
Standby-on current 2
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 (one side)
Input output gain
Output ON resistor (Upper)
Output ON resistor (lower)
Output limit current
PWM frequency
Spindle driver block 〈 FG output 〉
High voltage
Low voltage
Slide driver block 〈 Pre OP AMP 〉
Input range
Input bias current
Low level output voltage
Max output source current
Max output sink current
Slide driver block
Output offset voltage
Output saturation voltage "H"
Output saturation voltage "L"
Voltage gain
Actuator driver block
Output offset current
Max output voltage amplitude
Trans conductance
I
Q1
I
Q2
I
Q3
I
ST1
I
ST2
V
HB
I
HIB
V
HIM
V
HICM
V
DZSP
gmSP
V
OHSP
V
OMSP
I
LIMSP
fosc
V
FGH
V
FGL
V
ICMOP
I
BOP
V
OLOP
I
SOOP
IISIOP
VOOFSL
VOMSL
VOLSL
GVSL
I
OO
V
OM
Gm
−
−
−
−
−
0.5
−
50
1
20
1.2
−
−
1.5
−
4.7
−
0.3
−
−
−
−
−100
−
−
18.0
−8
3.6
1.4
26
20
2.9
−
−
1.0
1
200
~
50
1.5
0.6
0.25
1.8
100
4.9
0.1
~
80
0.1
−
−
0
1.3
0.5
20.0
0
4.0
1.7
40
32
4.5
1
1
1.5
5
−
4
100
1.8
1.0
0.5
2.0
−
−
0.2
11
300
0.5
0.3
1
100
1.6
0.85
22.0
8
−
2.0
mA
mA
mA
mA
mA
V
µA
mV
V
mV
Arms/V
Ω
Ω
A
kHz
V
V
V
nA
V
mA
mA
mV
V
V
dB
mA
V
A/V
Parameter Symbol Min. Typ. Max. Unit Conditions Circuit
V
CC
(Loading OFF)
V
CC
(Loading ON)
SPV
CC
V
CC
SPV
CC
IHB=10mA
RNF=0.33Ω
Io=500mA
IL=−500mA
RNF=0.33Ω
Connect 100kΩ
between FG and 5V
Io=500mA
Io=500mA
The gain of pre-OP AMP is 0dB
RL=8Ω
RL=8Ω
VIN=BIAS±0.2V
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
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
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
This product is not designed for protection against radioactive rays.
BD7903FS
Optical disc ICs
8/16
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 ON voltage
V
CC
drop-muting OFF voltage
V
CC
drop-muting hysteresis width
VOFLD
VOHLD
VOLLD
GVLD
VIH
VIL
VMVC
VMV
CC
ON
VMV
CC
OFF
VHYV
CC
−70
−
−
13.5
2.0
−
0.5
3.85
−
100
0
1.3
0.5
15.5
−
−
0.7
4.00
4.25
−
70
1.6
0.85
17.5
−
0.5
1.0
−
4.40
−
mV
V
V
dB
V
V
V
V
V
mV
Parameter Symbol Min. Typ. Max. Unit Conditions Circuit
Io=500mA
Io=500mA
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
This product is not designed for protection against radioactive rays.
BD7903FS
Optical disc ICs
9/16
!
!!
!Measurement circuits
1 14 15 16 17 18 19 20 21 22 23 24 25 26 272 3 109 12 1311
6
457 8
54 41 40 39 38 37 36 35 34 33 32 31 30 29 2853 52 4546 43 4244
49
51 50 48 47
DUTY
CONTROL
CURRENT
DETECTOR
HALL
BIAS
3FG
OUT
LEVEL
SHIFT
BREAK
MODE
STAND-BY
CONTROL
LEVEL
SHIFT
TSD
MATRIX
+
−
+
−
+
−
V
M
SPGND
V
C
PreV
CC
PowGND PreGND
V
M
ACT
SPV
CC
+
−
+
−
+
−
+
−
7.5k
7.5k
7.5k
60k 30k
10k
15k
+
−
+
−
10k 25k
20k
20k
10k
10k 7.5k
HALL AMP/REVERCE PROTECT
×2
×2
IU+IU−IW−IV−IV+
HU+
++++
HV+
IW+
IHB
HW+
H−
++
V
CC
V
CC
VSPRNF
SPRNF
2
1
SW-SP
VU W
SPOUT
LDIN 100p
SPIN V
C
ACIN ACIN
V
CC
DV
CC
VOL.OUT
OUT+
OUT−
SLED VOL.OUT
OUT+
OUT−
LOADING
ACT.OUT
NF
OUT−
OUT+
FOCUS
TRACKING
0.1µ
Fig.1
SW-OP
10k 10k
2
1
AV
AAAAA
DV
CC
VFG
VMB
VMSP
VOV
VOU
VSPGND
VOW
VDET
VSPIN
VLDIN
VEOFC
VFILFC
VINFC
VMSP
VINTK
V
C
100kΩ
V
CTL1
IQVC
IQDV
OPIN
OPOUT
CTL2
++
A
V
A
VMACT
IQAC
+
A
IOP
SLIN
VOOP
+
V
VOFOP
OPOUT
OPIN
+
100p
ACT.OUT
OUT−
OUT+
NF
VOPINSL
VOPOSL
VV
CC
VOSLP
VOSLM
VOLDP
VOLDM
VPOWGND
PREGND
VOFCM
VOFCP
VOTKM
VOTKP
VNFTK
VMACT
VNFFC
VCNF
VEOTK
VFILTK
BD7903FS
Optical disc ICs
10/16
Fig.2
SW-RLSW-RL
SW-IL
SW-IL
OUT+
NF
OUT−
V
O
1
11
2
2
2
1
2
RL
Rd
47µH
IL IL
ACT.OUT
V
+
SW-RL
SW-ILSW-IL
OUT+
OUT−
V
O
1
1
1
2
2
2
RL1
47µH
IL IL
VOL.OUT
V
+
SW-RL
1
247µHRLsp
RLsp
RLsp
U V W
ILSP
SPOUT
SW-IL
1
2
1
2
47µH
47µH
12-W
2-V
2-U
BD7903FS
Optical disc ICs
11/16
!
!!
!Table of measure circuit switches position 1
(VCC=SPVM=12V, DVCC=VMACT=5V, VC=1.65V, RL (act) =8Ω, RL (SL) =8Ω+47µH, RL (SP) =2Ω+47µH,
Pd=0.5Ω, SPRNF=0.33Ω, H−=2.5V, HU+=2.6V, HV+=HW+=2.4V)
Circuit current
IQ1
IQ2
IQ3
IST1
IST2
−
−
−
−
−
L
L
L
L
L
L
L
H
H
H
1
1
1
1
1
11
11
11
11
11
1
1
1
1
1
1
1
1
1
1
Designation INPUT
VIN SWITCHCTL
12RL
SP SL IL OP
Measure
point
Conditions
IQVC
IQVC
IQDV
IQVC
IQDV
Spindle driver block
〈 Torque command 〉
〈 Hall bias 〉
〈 Hall amplifier 〉
VHB
gmSP
RONUSP
RONLSP
ILIMSP
fosc
1.65V
0.65
∗2
0V
0V
0V
H
H
H
H
H
H
H
L
H
H
H
H
2
2
2
1
1
1
1
1
1
2
2
1
1
1
1
1
VDZSP ∗1HL 2111
1
1
1
2
2
111
IHIB 1.65V HH1111
∗1 Check VRNF with no output at VIN=VC±20mV
Check VRNF with output at VIN=VC±100mV
IHB=10mA
Current flowing in each terminal at H−=2.5V,
H+=2.7V (2.3V)
ILSP=500mA
ILSP=−500mA
RON = 0.5A
12V − VOSP
RON = 0.5A
VOSP
Pin 2
〈 FG 〉
VFGL 1.65V HH 1111 HW+=2.6V, HV+=2.6V, HW+=2.4V
VFGH 1.65V HH 1111
1
1
1
1
1
1
1
1
1
1HW+=2.6V, HV+=2.4V, HW+=2.4V
VFG
VFG
IU+ (−),
IV+ (−),
IW+ (−)
VSPRNF
VSPRNF
VSPRNF
OUTU, V, W
OUTU, V, W
VOSPU
∗2 Spindle driver
VIN=−400mV, VIN=−900mV gm (+) =( )/0.33Ω
VSPRNF1 − VSPRNF2
900mV − 400mV
BD7903FS
Optical disc ICs
12/16
!
!!
!Table of measure circuit switches position 2
(VCC=SPVM=12V, DVCC=VMACT=5V, VC=1.65V, RL (act) =8Ω, RL (SL) =8Ω+47µH, RL (SP) =2Ω+47µH,
Pd=0.5Ω, SPRNF=0.33Ω, H−=2.5V, HU+=2.6V, HV+=HW+=2.4V)
Actuator driver block
IBOP
IOSOOP
IOOAC
VOMAC
GMAC
1.65V
−
±0.20V
1.65V
3.3V
(0V)
HH
H
H
H
H
H
H
2
2
1
2
1
1
1
1
1
1
1
1
1
1
1
1
11
HH111
Designation INPUT
VIN SWITCHCTL
12RL
SP SL IL OP
Measure
point
Conditions
(VO − IOOAC×8) / 0.2×8
GVSL
±0.25V
HL 211 11
20log|(VO − VOFSL) / ±0.25)|
IOOAC=V
O
/8
20log |(VO − VOFLD) / ±0.25)|
IOP=500µA
IL=500mA
IL=−500mA
VOF
IOPB
VO
VO
VO
VO
12−OUT+ (−)
OUT+ (−)
VO
Loading driver block
Pre-operational amplifier block
IOSIOP
−
HH 111
IOP=−1mA
VOF
VOOP
VOLOP
5V
HH 111
1
1
1
1
2
2
2
1
VIH
VIL
1.65V
1.65V
H
L
H
L2
2
111
111
Check active at "H"=2.0
Check stand-by at "L"=0.5
IQVC
IQVC
CTL1, CTL2
VMVC
VMV
CC
ON
1.65V
1.65V
H
H
H
H1
1
111
111
1
1
1
1
Check all output at VC=0.5V
Check all output at V
CC
=4.0V
OUTPUT
OUTPUT
VMV
CC
OFF
1.65V
HH11111
Check all output at V
CC
=4.4V
OUTPUT
Others
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
1
1
1
1
2
2
Slide driver block
VOFSL
VOHSL
VOLSL
1.65V
3.3V
(0V)
0V
(3.3V)
H
H
H
L
L
L
2
1
1
1
1
1
1
1
1
1
2
2
1
1
1
IL=500mA
IL=−500mA
VO
12−OUT+ (−)
OUT+ (−)
VO
BD7903FS
Optical disc ICs
13/16
!
!!
!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) Spindle Slide Focus Tracking Loading
LL
HL
−H
CTL1
(Pin22) CTL2
(Pin23) SPIN < V
C
SPIN > V
C
LH
HH
Forward-rotation mode Reverse-rotation braking mode
Short-circuit braking modeForward-rotation mode
... ON ... OFF
1)
2)
3)
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.
HU HV HW
V
CC
Pin2
〈 Parallel connection 〉
V
CC
Pin2
〈 Series connection 〉
HU
HV
HW
BD7903FS
Optical disc ICs
14/16
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:
VC SPIN
SPRNF
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 motor can be decreased by connecting a resistor in series to each input terminal.
Spindle
Input-output gain
Output-limit current
Gain with the added resistor
0.5/RNF (Arms/V)
0.6/RNF (A/V)
29.7k/{RNF×(Rin+60k)} (Arms/V)
Rin : added series resistor
Gain expression (typ.)
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 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.
BD7903FS
Optical disc ICs
15/16
!
!!
!Application example
1 14 15 16 17 18 19 20 21 22 23 24 25 26 272 3 109 12 1311
6
457 8
54 41 40 39 38 37 36 35 34 33 32 31 30 29 2853 52 4546 43 4244
49
51 50 48 47
DUTY
CONTROL
CURRENT
DETECTOR
HALL
BIAS
3FG
OUT
LEVEL
SHIFT
BREAK
MODE
STAND-BY
CONTROL
LEVEL
SHIFT
TSD
MATRIX
+
−
+
−
+
−
V
M
SPGND
V
C
PreV
CC
PowGND PreGND
V
M
ACT
SPV
CC
+
−
+
−
+
−
+
−
7.5k
7.5k
7.5k
60k 30k
10k
15k
+
−
+
−
10k 25k
20k
20k
10k
10k 7.5k
HALL AMP/REVERCE PROTECT
×2
×2
V
CC
VC
OPOUT
SLIDE
IN
LOADING
TRACKING
PreV
CC
=12V
V
CC
VMACT
=5V
Fig.3
µ-COM
µ-COM
SPINDLE
INPUT
0.1µ
LOADING
INPUT TRACKING
INPUT
FOCUS
INPUT
0.33
SPINDLE
FG
100k
HALL3
HALL2
HALL1
M
SLIDE
M
FOCUS
Rd
Rd
0.1µ
0.1µ
SPV
CC
=5V
0.1µ
0.1µ
!
!!
!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.
3
25
19
50
VM
VM
SPRNF
RNF
12V
PreV
CC
close to RNF
close to IC
This range of wiring is considered as detection rasistor.
Please wire as wide and short as possible.
BD7903FS
Optical disc ICs
16/16
(2) Filtering capacitor
It is recommended to connect 0.1µF 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 (0.1µF) across the supply voltage lines close to the IC pins and please connect
large capacity and small ESR capacitor (10µF∼) 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.
!
!!
!Electrical characteristic curves
0 100755025 125 150
2
0
1
3
POWER DISSIPATION : Pd (W)
AMBIENT TEMPERATURE : Ta (°C)
Fig.4 Power dissipation
2.6W
∗ On less than 25.7% (percentage occupied by copper foil),
70×70mm
2
, t=1.6mm glass epoxy mounting.
!
!!
!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.
