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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=25C)
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 (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 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 SLIN 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+
47
HALL AMP/REVERCE PROTECT
HW-
46
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
8 9
LEVEL SHIFT
SLO- 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+
x2 VMACT x2
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
10k 5.4k 5k
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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BD7903FS
Optical disc ICs
OP Amp output
50pin 50pin 50pin 50pin 20k 7.5k
Feedback for FC, TK / Connection with capacitor for error amplifier 1
50pin
50pin
21
10k
23 31 33
7.5k 10k
28
Connection with capacitor for error amp 2
Control signal input
10k 51pin 50pin
22 29
50k
49 51
50k
Reference voltage input
50pin 10k 60k 50k
27
100
10k
50k
x4ch
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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 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 Symbol Min. Typ. Max. Unit Conditions Circuit
IQ1 IQ2 IQ3 IST1 IST2
- - - - -
26 20 2.9 - -
40 32 4.5 1 1
mA mA mA mA mA
VCC (Loading OFF) VCC (Loading ON) SPVCC VCC SPVCC
Fig.1, 2 Fig.1, 2 Fig.1, 2 Fig.1, 2 Fig.1, 2
VHB
0.5 - 50 1
1.0
1.5
V A mV V
IHB=10mA
Fig.1, 2 Fig.1, 2
Spindle driver block Hall amplifier Input bias current Input level Common mode input range
IHIB VHIM VHICM
1 200 ~
5 - 4
Fig.1, 2 Fig.1, 2 Fig.1, 2
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
VDZSP gmSP VOHSP VOMSP ILIMSP fosc
20 1.2 - - 1.5 -
50 1.5 0.6 0.25 1.8 100
100 1.8 1.0 0.5 2.0 - - 0.2
mV Arms/V A kHz RNF=0.33 Io=500mA IL=-500mA RNF=0.33
Fig.1, 2 Fig.1, 2 Fig.1, 2 Fig.1, 2 Fig.1, 2 Fig.1, 2
VFGH VFGL
4.7 -
4.9 0.1
V V
Connect 100k between FG and 5V
Fig.1, 2 Fig.1, 2
VICMOP IBOP VOLOP ISOOP IISIOP
0.3 - - - - -100 - - 18.0 -8 3.6 1.4
~ 80 0.1 - -
11 300 0.5 0.3 1
V nA V mA mA
Fig.1, 2 Fig.1, 2 Fig.1, 2 Fig.1, 2 Fig.1, 2
VOOFSL VOMSL VOLSL GVSL
0 1.3 0.5 20.0
100 1.6 0.85 22.0
mV V V dB Io=500mA Io=500mA The gain of pre-OP AMP is 0dB
Fig.1, 2 Fig.1, 2 Fig.1, 2 Fig.1, 2
IOO VOM Gm
0 4.0 1.7
8 - 2.0
mA V A/V
RL=8 RL=8 VIN=BIAS0.2V
Fig.1, 2 Fig.1, 2 Fig.1, 2
This product is not designed for protection against radioactive rays.
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Optical disc ICs
Parameter 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 VC drop-muting VCC drop-muting ON voltage VCC drop-muting OFF voltage VCC drop-muting hysteresis width Symbol Min. Typ. Max. Unit Conditions Circuit
VOFLD VOHLD VOLLD GVLD
-70 - - 13.5
0 1.3 0.5 15.5 - -
70 1.6 0.85 17.5 - 0.5
mV V V dB Io=500mA Io=500mA
Fig.1, 2 Fig.1, 2 Fig.1, 2 Fig.1, 2
VIH VIL
2.0 -
V V
Fig.1, 2 Fig.1, 2
VMVC VMVCC ON VMVCC OFF VHYVCC
0.5 3.85 - 100
0.7 4.00 4.25 -
1.0 - 4.40 -
V V V mV
Fig.1, 2 Fig.1, 2 Fig.1, 2 Fig.1, 2
This product is not designed for protection against radioactive rays.
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BD7903FS
Optical disc ICs
!Measurement circuits
VOFOP
OPIN OPOUT
V
+
FOCUS ACT.OUT NF
OUT- OUT+
TRACKING ACT.OUT NF
OUT- OUT+
OPOUT
OPIN
VCC
SW-OP
VOOP
V
+
2 1 DVCC CTL2
IQDV IQVC
CTL1
SLED VOL.OUT
OUT+ OUT-
LOADING VOL.OUT
OUT+ OUT-
10k SLIN
VPOWGND
10k
IQAC
+
VOPINSL VOPOSL
+
VMACT
PREGND
VOLDM
VOFCM
VOSLM
VOTKM
VMACT
VOLDP
VOFCP
VOSLP
VOTKP
VEOTK
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
SPVCC PreVCC
LEVEL SHIFT
BREAK MODE STAND-BY CONTROL
PowGND
PreGND
x2 VMACT x2
LEVEL SHIFT
TSD
10k
+ -
7.5k
-
7.5k
CURRENT DETECTOR
30k
20k
HALL AMP/REVERCE PROTECT
MATRIX
VM
SPGND
3FG HALL OUT BIAS
7.5k
60k
10k
10k
VSPGND
1
2
VMB
3
VMSP
4
5
6
7
8
9
10
VOV
11
VOU
12
13
14
15
16
17
18
VOW
19
VDET
20
VSPIN
21
VLDIN
22
VEOFC
23
VFILFC
24
VINFC
25
VMSP
26
VINTK
+
IHB
A
+
A
+
HU+
A
+
A
+
HV+
A
+
A
HW+
VSPRNF
V
1 SPRNF
SW-SP
VFG
V
100k
IU-
IU+
IV-
IV+
IW-
IW+
2
VC
SPIN LDIN
100p
ACIN VCC VCC
ACIN
DVCC H- V U
W SPOUT
Fig.1
+
+
+
-
-
20k
+
DUTY CONTROL
-
-
+
+
-
-
VC
27
VC
9/16
7.5k
-
+
25k
15k 10k
+
VFILTK
VNFFC
VNFTK
A
A
VVCC
IOP
+
VCNF
0.1 100p
A
BD7903FS
Optical disc ICs
VOL.OUT
OUT+
+ RL1
V
VO 1 SW-RL
47H 2 1 SW-IL IL IL
2 2 1 SW-IL
OUT+
SW-RL
OUT-
ACT.OUT
NF
OUT-
2
2
SW-RL
1 2 SW-IL IL
1 Rd VO +
11 2 IL SW-IL
V
RL
47H
SPOUT U V W 2 1 2 1 2 2-V 2-U 1 2-W SW-IL 1 SW-RL 47H RLsp 47H RLsp 47H RLsp
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 Circuit current IQ1 IQ2 IQ3 IST1 IST2 Hall bias VHB INPUT VIN CTL 1 2 SWITCH RL SP SL IL OP Conditions Measure point
- - - - -
L H L L L
H L H L L
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
IQVC IQVC IQDV IQVC IQDV
Spindle driver block
1.65V
H
H
1
1
1
1
1
IHB=10mA
Pin 2
Hall amplifier IHIB
1.65V
H
H
1
1
1
1
1
Current flowing in each terminal at H-=2.5V, H+=2.7V (2.3V)
IU+ (-), IV+ (-), IW+ (-)
Torque command VDZSP gmSP RONUSP RONLSP ILIMSP fosc FG VFGH VFGL
1 2 0V 0V 0V 0.65
L L H H H H
H H H H H H
2 2 1 1 2 2
1 1 2 2 1 1
1 1 1 1 1 1
1 1 2 2 1 1
1 1 1 1 1 1
1 Check VRNF with no output at VIN=VC20mV Check VRNF with output at VIN=VC100mV
VSPRNF VSPRNF
ILSP=500mA ILSP=-500mA
RON = 12V - VOSP 0.5A RON = VOSP 0.5A
OUTU, V, W OUTU, V, W VSPRNF VOSPU
1.65V 1.65V
H H
H H
1 1
1 1
1 1
1 1
1 1
HW+=2.6V, HV+=2.4V, HW+=2.4V HW+=2.6V, HV+=2.6V, HW+=2.4V
VFG VFG
2 Spindle driver VIN=-400mV, VIN=-900mV
gm (+) =(
VSPRNF1 - VSPRNF2 )/0.33 900mV - 400mV
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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 IL OP Conditions Measure point
Actuator driver block IOOAC VOMAC GMAC
1.65V 3.3V (0V) 0.20V
H H H
H H H
2 2 2
1 1 1
1 1 1
1 1 1
1 1 1
IOOAC=VO/8
VO VO
(VO - IOOACx8) / 0.2x8
VO
Slide driver block VOFSL VOHSL VOLSL GVSL
1.65V 3.3V (0V) 0V (3.3V) 0.25V
L L L L
H H H H
2 1 1 2
1 1 1 1
1 1 1 1
1 2 2 1
1 1 1 1
VO
IL=500mA IL=-500mA 20log|(VO - VOFSL) / 0.25)|
12-OUT+ (-) OUT+ (-) VO
Loading driver block VOFLD VOHLD VOLLD GVLD
1.65V 3.3V (0V) 0V (3.3V) 0.25V 1.65V - - 5V
H H H H
L L L L
2 1 1 2
1 1 1 1
1 1 1 1
1 2 2 1
1 1 1 1
VO
IL=500mA IL=-500mA 20log |(VO - VOFLD) / 0.25)|
12-OUT+ (-) OUT+ (-) VO
Pre-operational amplifier block IBOP IOSOOP IOSIOP VOLOP CTL1, CTL2 VIH VIL Others VMVC VMVCCON VMVCCOFF H H H H H H H H 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 1 IOPB
IOP=500A IOP=-1mA
VOF VOF VOOP
1.65V 1.65V
L H
L H
2 2
1 1
1 1
1 1
1 1
Check active at "H"=2.0 Check stand-by at "L"=0.5
IQVC IQVC
1.65V 1.65V 1.65V
H H H
H H H
1 1 1
1 1 1
1 1 1
1 1 1
1 1 1
Check all output at VC=0.5V Check all output at VCC=4.0V Check all output at VCC=4.4V
OUTPUT OUTPUT OUTPUT
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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) L H - CTL1 (Pin22) L H CTL2 (Pin23) L L H CTL2 (Pin23) H H SPIN < VC Forward-rotation mode Forward-rotation mode SPIN > VC Reverse-rotation braking mode Short-circuit braking mode 3) 4) Spindle Slide Focus Tracking Loading 1) 2)
... ON ... OFF
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 -
VC
SPIN
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 Output-limit current Gain with the added resistor 0.5/RNF (Arms/V) 0.6/RNF (A/V) 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.
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BD7903FS
Optical disc ICs
!Application example
PreVCC =12V SPVCC =5V SLIDE IN VCC VMACT =5V Rd
OPOUT
-COM
-COM
M
SLIDE
M
TRACKING LOADING FOCUS Rd
0.1
0.1
0.1
0.1
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
SPVCC PreVCC
LEVEL SHIFT
BREAK MODE STAND-BY CONTROL
PowGND
PreGND
x2 VMACT x2
7.5k 7.5k
LEVEL SHIFT
TSD
-
CURRENT DETECTOR
30k
20k
HALL AMP/REVERCE PROTECT
MATRIX
VM
SPGND
3FG HALL OUT BIAS
7.5k
60k
10k
10k
1
2
3
4
5
6
7
8
9
SPINDLE
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
100k
HALL1 HALL2 HALL3
FG
LOADING INPUT SPINDLE INPUT
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.
12V
This range of wiring is considered as detection rasistor. Please wire as wide and short as possible.
close to IC
3
RNF
VM
50
PreVCC close to RNF
25 19
VM
SPRNF
15/16
+
+
+
-
-
20k
+
DUTY CONTROL
-
-
+
+
-
-
+
VC
27
VC
7.5k
-
+
25k 10k
-
15k 10k
+
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.
!Electrical characteristic curves
POWER DISSIPATION : Pd (W)
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
54 28
13.40.3 11.40.2
4.00.2
1
27
2.20.1
6.00.2
0.150.1
0.1
0.8
0.360.1
0.1
SSOP-A54
0.3Min.
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