M54640P Mitsubishi Electronics America, Inc., M54640P Datasheet - Page 6

• Manufacturer Part Number: M54640P
• Description: Stepper Motor Driver
• Manufacturer: Mitsubishi Electronics America, Inc.

APPLICATION EXAMPLE
PRECAUTIONS FOR USE
(1) When the whole output current changes by a large margin (for
(2) When the supply voltage changes by a large margin, the
example, when overheat protection operation causes intermittent
flow of output current), the supply voltage may undergo a
change. Therefore, selection and wiring of power supply should
be conducted cautiously to avoid such a situation that the supply
voltage exceeds the absolute maximum ratings.
operation of this IC may become unstable. In this case, the
change of supply voltage can be controlled by connecting a
capacitor at the point near to IC pin between Vcc pin and GND
pin. (See above application example.)
Stepper motor
820pF
56k
16
16
1
1
1
15 14 13 12 11 10
15 14 13 12 11 10
2
2
1
820pF
56k
3
3
M54640P
M54640P
4
4
1k
5
5
1k
(3) Thermal shutdown function
• The state of thermal shutdown operation may differ according to
• The circuit board on which this IC is mounted is designed to
6
6
the way of wiring within a board. Therefore, sufficient board
evaluation should be conducted before use. When the board is
changed, operation on the replacing board should be evaluated.
realize low impedance between power supply and output pin.
Therefore, it is desirable to take a safe measure such as fixing a
fuse to avoid such a situation that the board is damaged by a fire
when output pin is internally short-circuited by excessively
applied surge voltage by accident.
7
7
820pF
820pF
9
8
9
8
MITSUBISHI <CONTROL / DRIVER IC>
STEPPER MOTOR DRIVER
47 F
5V
Phase A
I
I
24V
Phase B
I
I
0
1
0
1
A
A
B
B
M54640P