A2918 Allegro MicroSystems, A2918 Datasheet - Page 5

• Manufacturer Part Number: A2918
• Description: DUAL FULL-BRIDGE PWM MOTOR DRIVER
• Manufacturer: Allegro MicroSystems

LOAD SUPPLY pin (V
capacitor (≥47 µF) should be connected from
V
the device. Under no circumstances should
the voltage at V
determines the direction motor winding
current flows. An internally generated
deadtime, of approximately 3 µs, prevents
crossover currents that can occur when
switching the PHASE input.
be turned OFF, with V
a fast current decay through the internal
ground clamp and flyback diodes. The fast
current decay is desirable in half-step and
high-speed applications. The ENABLE input
must be tied low if it is not used.
provides continuous control of the peak load
current.
drivers when the junction temperature
reaches approximately +170°C. It is
intended only to protect the device from
failures due to excessive junction
temperature and should not imply that output
short circuits are permitted. The output
drivers are re-enabled when the junction
temperature cools to approximately +145°C.
BB
www.allegromicro.com
To avoid excessive voltage spikes on the
The PHASE input to each bridge
All four drivers in the bridge output can
Varying the reference voltage (V
Thermal protection circuitry turns OFF all
to the ground pin as close as possible to
BB
exceed 45 V.
EN
BB
), a large-value
≥ 2.4, resulting in
REF
)
Electric Co., Ltd. for sale by Allegro MicroSystems, Inc.
right to make, from time to time, such departures from the detail
specifications as may be required to permit improvements in the
performance, reliability, or manufacturability of their products.
Therefore, the user is cautioned to verify that the information in this
publication is current before placing any order.
life-support appliances, devices, or systems without express written
approval.
reliable. However, Sanken Electric Co., Ltd. and Allegro
MicroSystems, Inc. assume no responsibility for its use; nor for any
infringements of patents or other rights of third parties which may
result from its use.
The products described here are manufactured in Japan by Sanken
Sanken Electric Co., Ltd. and Allegro MicroSystems, Inc. reserve the
These products are not authorized for use as critical components in
The information included herein is believed to be accurate and
R S
PWM MOTOR DRIVER
DUAL FULL-BRIDGE
V
BB
BRIDGE ON
SOURCE OFF
ALL OFF
Dwg. EP-006-1
2918