an8480nsb Panasonic Corporation of North America, an8480nsb Datasheet - Page 6

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

AN8480NSB
■ Application Notes (continued)
■ Application Circuit Example
6
Servo
torque
command
Theory of thermal resistance
R
measurement because a package surface measurement does not always promise you a consistent measuring result.
f
High: Start
Medium: FG is on.
Low: Stop
in the above figure.
A chip temperature or the fin temperature can be understood in the same way as Ohm's Law.
Make sure that T
If it exceeds 150 C, you can suppress the rise of a chip temperature by adding a heat sink which is equivalent to
A package surface and the fin are available for a temperature measurement. But the fin part is recommendable for
R
T
f
ECR
H1
H1
H2
H2
H3
H3
j
VH
EC
T
T
j
T
2
3
5
6
8
9
7
18
17
a
a
V
R
R
P
matrix
amp.
CC
Hall
j-c
c-a
Hall
bias
(R
5 V
j
T
j-c
does not exceed 150 C.
Detection
EA
j
Start/stop
P
T
R
a
c-a
// R
P
Direction
detection
ER
EP ER EA
T
T
P : Electric power generated by IC
R
R
R
Absolute
Logic
j
a
j-c
c-a
f
value
f
(R
)
: Chip temperature
: Ambient temperature
: Thermal resistance between a chip and a package
: Thermal resistance between a package and a surface of a heat sink or free air
: Thermal resistance between a package and surface of a heat sink
j-c
changeover
Direction
R
c-a
0.1 F
// R
f
SDD00006CEB
VTL
)
distribution
distribution
Lower side
Upper side
protection
Thermal
circuit
Amp.
Amp.
Low: Short brake
High: Reverce rotation brake
circuit
Brake
comparator
Low: TSD on
High: TSD off
FG
V
M
21
22
28
27
26
12
1
VM
CS1
A1
A2
A3
PG
FG
12 V
R
CS
FG signal
0.5