|
|
Part: BD7905BFS
Category:
Optoelectronics
-> Drivers/Controllers
-> Optical Drivers
Description:
Company: ROHM Electronics
Datasheet: Download BD7905BFS datasheet File size : 130 kB
Request For quote: Find where to buy BD7905BFS
Datasheet text preview:
BD7905BFS
Optical disc ICs
6CH Power Driver for CD-ROM, DVD-ROM
BD7905BFS
BD7905BFS is a 6-channel driver IC that integrates all drivers necessary for optical disc driver. Low vibration, low noise, and low heat operation have been realized by adopting 180° PWM driving system for spindle motor driver. The built-in 2-channel sled motor driver is used for the stepping motor.
!Applications CD-ROM, DVD-ROM
!Features 1) 3channel BTL driver, 2channel PWM 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 5channels, brake mode and gain select 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 180deg 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 · Efficient drive by current feedback PWM drive. · Built in 2channel for stepping motor. Actuator driver, Loading driver · Linear BTL drive system.
1/17
BD7905BFS
Optical disc ICs
!Absolute maximum ratings (Ta=25°C)
Parameter POWER MOS power suuply voltage Preblock/BTL powerblock power supply voltage PWM control block power supply voltage Power dissipation Operating temperature range Storage temperature Symbol SPVM1,2,SLRNF1,2 VCC,SLVDD,AVM DVCC Pd Topr Tstg Limits 151 15 7 2.62 -40~+85 -55~+150 Unit V V V W °C °C
1 POWER MOS output terminals (9, 11, 18, 34~37pin) 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.
!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 Power supply voltage Spindle output current SL/FO/TR/LO output current Symbol SPVM1, 2 SLRNF1, 2 SLVDD, VCC AVM DVCC Iosp Ioo Min. - - AVM 4.3 4.3 - - Typ. VCC3 SLVDD3 12 5.0 5.0 1.2 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 SLRNF1, 2. 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.
2/17
BD7905BFS
Optical disc ICs
!Block diagram
SLRNF2
SLRNF1
SPCNF
SLO1+
SLO1-
SLO2+
SLO2-
AGND
SLVDD
SLIN2
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
47k
29
28
67k
LEVEL SHIFT
-
-
SLIN1
+
FCO+
FCO-
LDO+
LDO-
TKO+
TKO-
DVCC
FCIN
TKIN
GN D
GN D
GN D
GN D
GN D
AVM
VCC
47k
-
+
LEVEL SHIFT
LEVEL SHIFT
PRE LOGIC
PRE LOGIC FF LIMIT
47k
117.5k 117.5k
-
TSD
OSC
FF
67k
FG
REVERSE DETECT
HALL BIAS
1
HU+
2
HU-
3
HV+
4
HV-
5
HW+
6
HW-
7
HB
GND
GND
GND
GND
GND
SPVM1
PGND2
SPVM2
SPRNF
DGND
V
W
FG
CTL1
CTL2
SPIN
PGND1
LDIN
U
VC
+
+
47k
LIMIT
OSC Polarity COMP
Current LIMIT
188k PRE LOGIC FG 75k
- -
+ +
47k 112.5k
STBY/ BRAKE CONTROL
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
3/17
BD7905BFS
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- HW+ HW- HB PGND1 U SPVM1 V GND GND GND GND GND PGND2 W SPVM2 SPRNF FG CTL1 CTL2 SPIN DGND LDIN VC Function Hall amp. U positive input Hall amp. U negative input Hall amp. V positive input Hall amp. V negative input Hall amp. W positive input Hall amp. W negative input Hall bias Spindle driver power ground 1 Spindle driver output U Spindle driver power supply 1 Spindle driver output V GND GND GND GND GND Spindle driver power ground 2 Spindle driver output W Spindle driver power supply 2 Spindle driver current sense Frequency generator output Driver logic control input 1 Driver logic control input 2 Spindle driver input PWM block pre-ground Loading 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 SLIN1 SLIN2 SLVDD SLRNF1 SLRNF2 SPCNF SLO2- SLO2+ SLO1- SLO1+ AGND GND GND GND GND GND AVM FCO- FCO+ TKO- TKO+ LDO- LDO+ VCC TKIN FCIN DVCC Function Sled driver 1 input Sled driver 2 input Sled driver PowerMOS pre-supply Sled driver 1 current sense Sled driver 2 current sense Spindle driver feedback filter Sled driver 2 negative output Sled driver 2 positive output Sled driver 1 negative output Sled driver 1 positive output BTL block and sled driver power ground GND GND GND GND GND Actuator driver block power supply Focus driver negative output Focus driver positive output Tracking driver negative output Tracking driver positive output Loading driver negative output Loading driver positive output BTL pre and Loading power supply Tracking driver input Focus driver input PWM block control power supply
Positive/negative of the output terminals are determined in reference to those of the input terminals.
4/17
BD7905BFS
Optical disc ICs
!Input output circuit
Three-phase motor driver output
19 10
Spindle driver current detection input
51pin
Hall bias
54pin
312.5
18 11 9 20
7
8 17
Hall signal input
54pin 54pin 54pin
Splindle driver feedback filter pin
FG signal output
54pin
54pin
1 3 5 2 4 6 33
21
10k
PWM driver output SLED1, 2
31 32
BTL driver output FO, TK
44pin 51pin 51pin 51pin
BTL driver output LD
51pin 51pin
34 36
35 37
45 47
46 48
49
50
BTL driver input FO, TK, LD
51pin
PWM driver input SLED1, 2
54pin
PWM driver input Spindle
54pin
51pin
30pin
54pin
26 52 53
47k
28 29
47k
24
112.5k
Reference voltage input
51pin 10k 112.5k 50k
27
Control signal input
54pin 54pin 50k 50k
47k
10k
150k
50k
22 23
50k
×3ch
×2ch
5/17
Others parts begin by bd
BD-1 BD-2 BD-3 BD-4 BD-5 BD-6 BD-7 BD-8 BD-9 BD-10 BD-11 BD-12 BD-13
|
|
|
