M54671SP Mitsubishi Electronics America, Inc., M54671SP Datasheet - Page 3

• Manufacturer Part Number: M54671SP
• Description: 2-phase Stepper Motor Driver
• Manufacturer: Mitsubishi Electronics America, Inc.

SWITCHING CHARACTERISTICS
TIMING CHART
2-phase excitation
Switching waveforms
V
1/2
V
CH
1
MA
V
E
Phase 1
Phase 2
-V
MB
or V
T
ON
MB
-V
t
MA
d
T
OFF
T
OFF
= 0.69 x R
T
x C
T
APPLICATION DESCRIPTION
(1) PHASE INPUT
(2) V
(3) Current sensor
(4) Single pulse generator
(5) Analog control
TYPICAL CHARACTERISTICS
Phase input decides the output mode.
The current level can be continuously changed by changing the
voltage at V
When the voltage fall at the current sensing resistor and the
selected current level become of the same level, the
comparator triggers monostable. Then the output stage is cut
off for a certain time (T
decreases slightly and falls short of the comparative level.
After the cutoff time (T
again. This operation is repeated.
At the comparator output rise edge, the monostable is
triggered. The pulse width of the monostable at the external
timing C
Retrigger during T
The output current level can be continuously changed by
changing the voltage at V
comparator.
R
T
PHASE
OFF
(Comparative voltage)
H
L
= 0.69 x C
2-PHASE STEPPER MOTOR DRIVER
T
MITSUBISHI <CONTROL / DRIVER IC>
3
2
1
and R
0
R
continuously.
2.5W
1.7W
T
10
is as follows.
T
OFF
M
Ambient Temperature T
H
L
x R
A
20
is neglected.
T
OFF
OFF
Free air
(
30
). During this cutoff time, the current
10cm
(
c-a
), the output stage is in ON state
R
Thermal
c-a
= 48.5 C/W)
or the feedback voltage to the
= 25 C/W)
40
2
M
H
L
aluminum heat sink
B
50
M54671SP
j-c
a
= 25 C/W
( C)
60
70
80