2544 データシートの表示（PDF） - Allegro MicroSystems
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2544 Datasheet PDF : 4 Pages
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2544
QUAD DARLINGTON
POWER DRIVER
TYPICAL APPLICATION
(UNIPOLAR STEPPER MOTOR WITH ZENER FLYBACK)
Dwg. EP-015
TRUTH TABLE
INPUTS
1/2 3/4
L
H
L
L
H
L
H
H
A
ON
OFF
OFF
ON
WINDINGS
B
C
ON
ON
OFF
OFF
OFF
ON
ON
OFF
D
OFF
OFF
ON
ON
V BB
VOUT(SAT)
VBB + VZ + VF
V BB+ VF
ZENER CLAMP
DIODE CLAMP
Dwg. WP-001
APPLICATIONS INFORMATION
A typical application is shown driving a four-phase unipolar stepper
motor. Note that with the complimentary control inputs, only two logic
signals are needed to drive the motor in the two-phase format. The two
phase drive format illustrated, energizes two adjacent phases in each
detent position (AB, BC, CD, DA) to provide an improved torque-speed
product and greater detent torque.
A Zener diode can be used to increase the flyback voltage. The
increased flyback voltage gives a much faster inductive load turn-OFF
current decay resulting in improved motor performance. The maximum
Zener voltage, plus the load supply voltage, plus the flyback diode
forward voltage must not exceed the device’s rated sustaining voltage.
With external control circuitry, the ENABLE input (active low) can be
used for chopper (PWM) applications. If the ENABLE input is not used,
it should be tied low.
All inputs will float high if open circuited.
Allegro MicroSystems, Inc. reserves the right to make, from
time to time, such departures from the detail specifications as
may be required to permit improvements in the design of its
products.
The information included herein is believed to be accurate
and reliable. However, Allegro MicroSystems, Inc. assumes no
responsibility for its use; nor for any infringements of patents or
other rights of third parties which may result from its use.
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