M54646AP Mitsubishi Electronics America, Inc., M54646AP Datasheet - Page 3

• Manufacturer Part Number: M54646AP
• Description: 2-phase Motor Driver
• Manufacturer: Mitsubishi Electronics America, Inc.

SWITCHING CHARACTERISTICS
SWITCHING WAVEFORM
TIMING CHART
Two-phase
excitation
Phase 1
Phase 2
V
1/2
CH
1
V
VE
MA
– V
MB
t
or V
ON
MB
– V
t
d
MA
t
OFF
t
OFF
=0.69 • R
T
• C
T
APPLICATION DIRECTIONS
(1) Phase input
(2) V
(3) Current sensor
(4) Single-pulse generator
(5) Analog control
Phase input determines output mode:
Stepless current level variation is available by continuously
changing V
Compares voltage converted from amperage by current
sensing resistor to designated reference voltage level. When
they are the same, comparator triggers Mono-stable, and shuts
off output transistor during time frame t
current level decreases to slightly below reference level. When
period has passed, output transistor is reactivated. This series
of operations is repeated.
Mono-stable is triggered at comparator output phase rise edge.
Mono-stable output pulse width is determined by input to timing
terminals R
If new trigger occurs during t
Stepless output current level variation is available by
continuously changing voltage V
comparator.
R
(reference voltage)
PHASE
t
H
L
OFF
MITSUBISHI <CONTROL / DRIVER IC>
2-PHASE STEPPER MOTOR DRIVER
R
T
= 0.69
.
and C
T
, as follows:
R
T
M
H
L
A
C
T
OFF
, it is ignored.
R
M54646AP
M
or feedback voltage to
H
L
B
OFF
. During this period,