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AN8813NSB Datasheet, PDF (5/5 Pages) Panasonic Semiconductor – 4-channel driver IC for optical disk drive | |||
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ICs for Compact Disc/CD-ROM Player
s Application Circuit Example
VREF
V3 V2 V1
R3 R2 R1
PVCC1
AN8813NSB
RL1
RL2
5V
V4
SVCC
PVCC2
RL4
RL3
When the AN8813NSB is use, take into account the following cautions and follow the power dissipation characteristic curve.
1. Load current IP1 flowing into load RL1, RL2 is supplied through pin 20.
IP1
=
|
V18 âV17
RL1
|
+
| V16 âV15 |
RL2
2. Load current IP2 flowing into load RL3, RL4 is supplied through pin 9.
IP2
=
|
V14 âV13
RL3
|
+
| V12 âV11 |
RL4
3. Dissipation increase (âPD) inside the IC (power output stage) caused by loads RL1, RL2, RL3 and RL4 is as follows:
âPD = (PVCC1 â | V18 âV17 |) Ã
| V18 âV17 |
RL1
+
(PVCC1
â
|
V16
â
V15
|)
+
|
V16 âV15
RL2
|
= (PVCC2 â | V14 âV13 |) Ã
| V14 âV13 |
RL3
+
(PVCC2
â
|
V12
â
V11
|)
Ã
|
V12 âV11
RL4
|
4. Dissipation increase (âPS) inside the IC (signal block supplied from pin 7) caused by loads RL1, RL2, RL3 and RL4
comes roughly as follows:
âPS
=
3
Ã
{
V1
R1
Ã
(2
Ã
SVCC +
|
V18
âV17
|)
+
V2
R2
Ã
(2
Ã
SVCC
+
|
V16
âV15
|)
+
V3
R3
à (2 à SVCC + | V14 âV13 |)} +
V4
R4
Ã
(3
Ã
SVCC
+
|
V12
âV11
|),
where
R4:
Internal
resistor
12.3
kâ¦
5. Dissipation increase in a driver operating mode is âPD + âPS .
6. Allowable power dissipation without load (PD1) can be found as follows:
PD1 = SVCC Ã I(SVCC) +PVCC1 Ã I(PVCC1) + PVCC2 Ã I(PVCC2)
7. Allowable power dissipation in a load operating mode (PD) comes roughly as follows:
PD = PD1 + âPD + âPS
5
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