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PDF AN8480NSB Data sheet ( Hoja de datos )
| Número de pieza | AN8480NSB | |
| Descripción | 3-phase full-wave motor driver IC | |
| Fabricantes | Panasonic Semiconductor | |
| Logotipo |  |
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ICs for Compact Disc/CD-ROM Player
AN8480NSB
3-phase full-wave motor driver IC
s Overview
The AN8480NSB is a 3-phase full-wave motor
driver IC with a reverse rotation brake/short brake
changeover function, incorporating a thermal pro-
tection circuit with its protection monitor pin.
s Features
• 3-phase full-wave and snubberless
• FG output
• Current limit
• Reverse rotation prevention
• Thermal protection circuit built-in (with thermal
protection monitor pin)
s Applications
• Various types of optical disk drive
18.4±0.2
(5.15)
(4.8)
28 22
21 15
17
8 14
(1.2)
(6.4)
0.8
0.35
+0.10
–0.05
Seating plane
HSOP042-P-0400
s Block Diagram
Unit: mm
(1.315)
0° to 10°
0.65±0.20
2
H1+
3
H1−
5
H2+
H2− 6
H3+ 8
H3− 9
7
VH
Hall
amp.
matrix
Direction
changeover
Detection
Hall
bias
Direction
detection
ER
Logic
EP = ER × ΕΑ
Upper side
distribution Amp.
Lower side Amp.
distribution
EC 18
ECR 17
EA
Absolute
value
Start/stop
VTL
Thermal
protection
circuit
Brake
circuit
21
VM
22
CS1
28
A1
27
A2
26
A3
1
PG
FG
comparator
12
FG
1
1 page  
ICs for Compact Disc/CD-ROM Player
AN8480NSB
s Application Notes (continued)
• Phase conditions between Hall input and output current
Phase of Hall pin
H1+ H2+ H3+
H1 H3 H2
A HM L
B H LM
CML H
D LMH
E L HM
F MH L
ECR
EC
Emit
A3 A2 A1
H1 H2
H3
A2 A3
A1
0
0
Output current
0
Sink
ABCDE F
• Power consumption calculation method
You can find a rough value of electric power to be consumed in the IC in the following method and the use of EXCEL
(computer soft ware) will enable you to put it on a graph.
Calculating formula:
1. Let an induced voltage generated in each phase as below:
(Reference to a motor center point)
EA1 = EO × sin (X) · · · (1)
EA3 = EO × sin (X+240) · · · (3)
EA2 = EO × sin (X+120) · · · (2)
X: Phase angle
2. Let a current flowing in each phase as below:
IA1 = IO × sin (X) · · · (4)
IA3 = IO × sin (X+240) · · · (6)
IA2 = IO × sin (X+120) · · · (5)
3. The voltages generated by a wire-wound resistance of a motor are:
VR1 = IA1 × R · · · (7)
VR2 = IA2 × R · · · (8)
VR3 = IA3 × R · · · (9)
4. In each phase, add the voltage generated by an induced voltage and that by a wire-wound resistance.
VA1' = (1) + (4)
VA2' = (2) + (5)
VA3' = (3) + (6)
5. As the lowest voltage in each phase angle must be 0 V, you can get the voltage to be generated in each phase by
means of subtracting the lowest voltage from the voltage of the remaining two phases.
VA1 = VA1' − MIN (VA1', VA2', VA3') · · · (10)
VA2 = VA2' − MIN (VA1', VA2', VA3') · · · (11)
VA3 = VA3' − MIN (VA1', VA2', VA3') · · · (12)
6. Subtract the supply voltage from each phase's voltage found in item 5 and then multiply it by each phase's current,
so that you can get the power consumption.
3
ΣP = (12 − VAn ) × IAn
n=1
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet AN8480NSB.PDF ] | |
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