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Part: BD7904FS
Category:
Optoelectronics
-> Drivers/Controllers
-> Optical Drivers
Description:
Company: ROHM Electronics
Datasheet: Download BD7904FS datasheet File size : 130 kB
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Datasheet text preview:
BD7904FS
Optical disc ICs
5ch Power Driver for CD-ROM, DVD-ROM
BD7904FS
BD7904FS is a 5-channel driver IC that integrates all drivers and 3.3V regulator necessary for CD-ROM, and DVD-ROM systems into a single chip. Low head operation can be achieved by applying the PWM driving system for sled and spindle motor drivers.
!Applications CD-ROM, DVD-ROM
!Features 1) 3channel BTL driver, 1channel PWM driver and 3phase motor driver. - ALL of the motor and actuator for CD-ROM, DVD-ROM etc. 2) ON/OFF for each driver, brake mode switching of spindle, and stand-by mode switching can be controlled by the two control terminals. 3) Built-in triangular-wave generator. 4) SSOP-A54 for strong head radiation. 5) Built in thermal-shut-down circuit. 6) FG 3phase synthetic output.
!Absolute maximum ratings (Ta=25°C)
Parameter POWER MOS power suuply voltage Preblock/BTL powerblock power supply voltage PWM control block, REG power supply voltage Power dissipation Operating temperature range Storage temperature Symbol SPVM1,2,SLRNF VCC,SLVDD,AVM DVCC Pd Topr Tstg Limits 151 15 7 2.62 -35~+85 -55~+150 Unit V V V W °C °C
1 POWER MOS output terminals (10, 11, 18, 47, 48pin) is contained. 2 PCB (70mm×70mm×1.6mm glass epoxy) mounting. Reduced by 20.8mW for each increase in Ta of 1°C over 25°C.
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BD7904FS
Optical disc ICs
!Recommended operating conditions (Ta=25°C) (Set the power supply voltage taking allowable dissipation into considering)
Parameter POWER MOS Power supply voltage 1 POWER MOS Power supply voltage 2 Preblock Power supply voltage Power block Power supply voltage PWM control block, REG Power supply voltage Spindle output current SL/FO/TR/LO output current Symbol SPVM1, 2 SLRNF SLVDD, VCC AVM DVCC Iosp Ioo Min. - - AVM 4.3 4.3 - - Typ. VCC3 SLVDD3 12 5.0 5.0 1.0 0.5 Max. - - 14 VCC 6.0 2.54 0.8 Unit V V V V V A A
3 Set the same supply voltage to VCC and SPVM1, 2 to SLVDD and SLRNF. 4 The current is guaranteed 3.0A in case of the current is turned on/off in a duty-ratio of less than 1/10 with a maximum on-time of 5msec.
!Block diagram
SLRNF
SLOPI
LDIN
54
53
52
51
50
49
48
47
46
45
44
VCC
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
OSC
LIMIT
FG
REVERSE DETECT
1
HU+
2
HU-
3
HV+
4
HV-
5
SPVM1
6
HW+
7
HW-
8
CTL1
9
CTL2
10
U
11
V
12
GND
13
GND
14
GND
15
GND
16
GND
17
PGND
18
W
19
VC
20
SPIN
SPRNF
HB
SPVM2
DGND
DVCC
REGOUT
REGNF
+
STBY/ BRAKE CONTROL
VC
-
HALL BIAS
21
22
23
24
25
-
+
+
-
Current COMP
FF
-
-
+
FF
-
-
FG
+
PRE LOGIC
LEVEL SHIFT
LEVEL SHIFT
LEVEL SHIFT
TSD
PWM OUT 3-phase MATRIX
OSC Polarity COMP
Current LIMIT
BG (1.3V)
-
+
26
-
-
+
+
27
REGGND
FCOPO
TKOPO
+
SLOPO
SLVDD
FCOPI
TKOPI
AGND
FCO+
FCO-
LDO+
LDO-
TKO+
TKO-
SLO+
SLO-
GND
GND
GND
GND
GND
AVM
FG
+
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BD7904FS
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 HU+ HU- HV+ HV- SPVM1 HW+ HW- CTL1 CTL2 U V GND GND GND GND GND PGND W VC SPIN SPRNF HB SPVM2 DGND DVCC REGOUT REGNF Function Hall amp. U positive input Hall amp. U negative input Hall amp. V positive input Hall amp. V negative input Spindle driver power supply 1 Hall amp. W positive input Hall amp. W negative input Driver logic control input 1 Driver logic control input 2 Spindle driver output U Spindle driver output V GND GND GND GND GND Spindle driver power ground Spindle driver output W Reference voltage input Spindle driver input Spindle driver current sense Hall bias Spindle driver power supply 2 PWM block pre-ground PWM block control power supply Regulator output voltage pin Regulator return pin 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 REGGND TKOPI TKOPO AVM FCOPI FCOPO FCO- FCO+ TKO- TKO+ AGND GND GND GND GND GND VCC LDO- LDO+ SLO- SLO+ SLVDD SLOPO SLOPI SLRNF LDIN FG Function Regulator block ground Tracking driver OP-AMP-input Tracking driver OP-AMP output Actuator driver block power supply Focus driver OP-AMP-input Focus driver OP-AMP output Focus driver negative output Focus driver positive output Tracking driver negative output Tracking driver positive output Ground GND GND GND GND GND BTL pre and Loading power supply Loading driver negative output Loading driver positive output Sled driver negative output Sled driver positive output Sled driver PowerMOS pre-supply Sled driver OP-AMP output Sled driver OP-AMP- input Sled driver current sense Loading driver input Frequency generator output
Positive/negative of the output terminals are determined in reference to those of the input terminals.
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BD7904FS
Optical disc ICs
!Input output circuit
Three-phase motor driver output
23 5
Spindle driver current detection input
Hall bias
25pin
44pin
18
11
10
21
22
17
Hall signal input
25pin 25pin 25pin
FG signal output
25pin
1 3 6
2 4 7 54
PWM driver output SLED
52
BTL driver output FO, TK
BTL driver output LD
31pin 44pin 44pin 44pin
44pin 44pin
47
48
35 37
34 36
45
46
38
BTL driver input FO, TK
PWM driver input SLED1, 2
PWM driver input Spindle
44pin
49pin 25pin
25pin
44pin
49pin
20
29 32 51
×6 ×5
VC
VC
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BD7904FS
Optical disc ICs
Control signal reference voltage input PWM driver input LOADING
44pin 44pin 10k 15k 50k
19
44pin ×2
53
50k
20k
VC
Regulator output
25pin ×30 25pin 20k B.G.
26
Regulator REGNF terminal
25pin
25pin
27
51.5k 32.76k
28
Control signal input
25pin 25pin 50k 50k
8 9
50k
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