M54640P Mitsubishi Electronics America, Inc., M54640P Datasheet - Page 3

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

SWITCHING CHARACTERISTICS
Test circuit
APPLICATION DESCRIPTION
• PHASE INPUT
• I
Phase input decides the output mode.
I
output current level.
The current level can be continuously changed by changing the
voltage at V
0
0
, I
C
PHASE
and I
R
1
T
T
H
H
L
I
H
L
L
0
1
fixed based on the comparison voltage V
R
continuously.
M
H
I
H
H
L
L
L
1
A
1
2
4
5
3
6
8
7
M
GND
I
Phase
T
V
V
1
Current level
MM
CC
B
Average
R
R
R
C
C
C
M
S
C
T
C
T
V
High
H
L
Low
: 1
: 1k
: 56k
: 820pF
: 820pF
: 47 F
B
0
GND
V
M
MM
V
C 10
E
I
A
R
0
16
15
14
13
12
11
9
C
V
R
decide the
R
C
C
R
C
S
V
• Current sensor
• Single pulse generator
• Analog control
Switching waveforms
CC
When the voltage fall at the current sensing resistor and the
selected current level becomes of the same level, the comparator
triggers the monostable. Then, the output stage is cut off for a
certain time (t
decreases slightly and falls short of the comparison level.
After the cutoff time (t
This operation is repeated.
At the comparator output rise edge, the monostable is triggered.
The pulse width of the monostable at the external timing R
C
Retrigger during t
The output current level can be continuously changed by
changing the voltage at V
comparator.
t
is as follows.
V
V
V
1/2
CH
CM
CL
MITSUBISHI <CONTROL / DRIVER IC>
1
V
MA
OFF
– V
OFF
). During this cutoff time, the current volume
MB
or V
is neglected.
t
OFF
ON
MB
t
STEPPER MOTOR DRIVER
), the output stage is in ON state again.
OFF
– V
R
MA
= 0.69 x R
t
d
or the feedback voltage to the
t
OFF
t
C
M54640P
t
t
OFF
= 0.69RTCT
t
and