an8480nsb Panasonic Corporation of North America, an8480nsb Datasheet - Page 5

• Manufacturer Part Number: an8480nsb
• Description: 3-phase Full-wave Motor Driver Ic
• Manufacturer: Panasonic Corporation of North America

■ Application Notes (continued)
Phase conditions between Hall input and output current
Power consumption calculation method
(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:
2. Let a current flowing in each phase as below:
3. The voltages generated by a wire-wound resistance of a motor are:
4. In each phase, add the voltage generated by an induced voltage and that by a wire-wound resistance.
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
6. Subtract the supply voltage from each phase's voltage found in item 5 and then multiply it by each phase's current,
A
B
C
D
E
F
You can find a rough value of electric power to be consumed in the IC in the following method and the use of EXCEL
(Reference to a motor center point)
means of subtracting the lowest voltage from the voltage of the remaining two phases.
so that you can get the power consumption.
Phase of Hall pin
E
E
I
I
V
V
V
V
V
P
A1
A3
H1
A1
A3
R1
A1
A1
A2
A3
M
M
H
H
L
L
n 1
'
3
I
I
E
E
O
O
I
V
V
V
(1)
A1
12
O
O
A1
A2
A3
H2
sin (X) · · · (4)
sin (X 240) · · · (6)
'
'
'
M
M
H
H
L
L
Output current
sin (X) · · · (1)
sin (X 240) · · · (3)
R · · · (7)
(4)
V
MIN (V
MIN (V
MIN (V
An
H3
M
M
H
H
L
L
I
Emit
Sink
An
A1
A1
A1
', V
', V
', V
A2
A2
A2
V
V
', V
', V
', V
R2
A2
A
'
A3
A3
A3
H1
A3
') · · · (10)
') · · · (11)
') · · · (12)
I
(2)
A2
B
X: Phase angle
E
I
A2
A2
R · · · (8)
C
(5)
SDD00006CEB
I
E
H3
A2
O
O
D
sin (X 120) · · · (5)
sin (X 120) · · · (2)
E
V
H2
A1
A3
F
'
EC
(3)
V
R3
(6)
ECR
I
A3
R · · · (9)
A2
H1
A3
AN8480NSB
H2
H3
A1
0
0
0
5