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參數(shù)資料
| 型號(hào)： | BD7902CFS |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | 6CH Power Driver for CD-ROM, DVD-ROM |
| 中文描述： | 6路功率驅(qū)動(dòng)器為CD - ROM，DVD - ROM光碟 |
| 文件頁數(shù)： | 16/18頁 |
| 文件大?。?/td> | 200K |
| 代理商： | BD7902CFS |
BD7902CFS
Optical disc ICs
!
Application example
16/17
1
14
15
16
17
18
19
20
21
22
23
24
25
26
27
2
3
10
9
12
13
11
6
4
5
7
8
54
41
40
39
38
37
36
35
34
33
32
31
30
29
28
53
52
45
46
43
42
44
49
51
50
48
47
PRE
LOGIC
FF
FF
FF
LIMIT
Current
HALL
FG
REVERSE
Current
COMP
Polarity
COMP
PWM
OUT
LIMIT
OSC
PRE
LOGIC
CSTBY/
LEVEL
SHIFT
LEVEL
SHIFT
LEVEL
SHIFT
TSD
3-phase
MATRIX
+
+
47k
47k
94k
47k
15k
15k
47k
47k
+
+
+
+
94k
94k
47k
47k
FG
FG
LOADING
IN
VC
FOCUS
IN
TRACKING
IN
LOADING
M
TRACKING
DV
CC
=
5V
V
CC
=
12V
AVM
=
5V
Fig.3
μ
-COM
μ
-COM
SPINDLE
IN
5V
SPVM
=
12V
SPRNF
SPINDLE
H
H
H
SLED
IN1
SLED
IN2
SLVM
=
12V
FOCUS
S
S
S
S
S
!
Operation notes
(1) Wiring for SPRNF and SLRNF
Considering the wiring resistance, connect each detecting resistor as close as possible to the current detection
terminals for the spindle drive SPRNF (pin 20) and the sled motor drive SLRNF 1 and 2 (pin 31 and 32) of the IC.
(2) Current detection reference voltage
The detection of current in the spindle and sled involves the detection of voltage between the detection resistances,
but as the reference voltage of internal circuit, the voltage applied to V
CC
(pin 51) is used by the spindle and that
applied to SLVDD (pin 30) by the sled.
For this reason, be sure to apply V
CC
(pin 51) to the spindle and SLVDD (pin 30) to the sled according to the
corresponding power supply voltages to prevent voltage differences.
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