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參數(shù)資料
| 型號(hào)： | AN8787NSB |
| 廠商： | PANASONIC CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 4-channel linear driver IC for CD/CD-ROM drive |
| 中文描述： | DISK DRIVE MOTOR CONTROLLER, PDSO28 |
| 封裝： | 0.400 INCH, PLASTIC, HSOP-28 |
| 文件頁(yè)數(shù)： | 7/7頁(yè) |
| 文件大?。?/td> | 61K |
| 代理商： | AN8787NSB |
ICs for Compact Disc/CD-ROM Player
AN8787NSB
7
I
Application Circuit Example (continued)
3. Load current I
P3
flowing into load RL3 is supplied through pin 13 via the resistor RS3.
I
P3
=|
V
14
V
12
|
R
L3
4. Load current I
P4
flowing into load RL4 is supplied through pin 9 via the resistor RS4.
|
V
10
V
8
|
R
L4
5. Dissipation increase (
P
D
) inside the IC (power output stage) caused by loads RL1, RL2, RL3 and RL4 is as follows:
P
D
=
(V
CC1
|
V
20
V
18
|
)
×|
V
20
V
18
|+
{
V
CC3
(R
S3
+
R
L3
)
×|
V
14
V
12
|
}
×|
V
14
V
12
|
R
L1
+
(V
CC2
|
V
17
V
15
|
)
×|
V
17
V
15
|+
{
V
CC3
(R
S4
+
R
L4
)
×|
V
10
V
8
|
}
×
R
L2
6. Dissipation increase (
P
S
) inside the IC (signal block supplied from pin 27) caused by loads RL1, RL2, RL3 and RL4
comes roughly as follows:
P
S
=
3
×
V
1
×
(2
×
SV
CC
+
|
V
20
V
18
|
) +I
P2
×
(SV
CC
|
V
17
V
15
|
)
R
1
K
+
I
P3
×
(SV
CC
|
V
14
V
12
|
) +I
P4
×
(SV
CC
|
V
10
V
8
|
), where K
≈
100
K
K
I
P4
=
R
L3
R
L3
|
V
10
V
8
|
R
L4
R
L4
7. Dissipation increase in a driver operating mode is
P
D
+
P
S
.
8. Allowable power dissipation without load (P
D1
) can be found as follows:
P
D1
=
SV
CC
×
I
(SVCC)
+
V
CC1
×
I
(VCC1)
+
V
CC2
×
I
(VCC2)
+
V
CC3
×
I
(VCC3)
9. Allowable power dissipation in a load operating mode (P
D
) comes roughly as follows:
P
D
=
P
D1
+
P
D
+
P
S
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