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PDF 2918 Data sheet ( Hoja de datos )

Número de pieza 2918
Descripción DUAL FULL-BRIDGE PWM MOTOR DRIVER
Fabricantes Allegro MicroSystems 
Logotipo Allegro MicroSystems Logotipo



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No Preview Available ! 2918 Hoja de datos, Descripción, Manual

2918
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
The A2918SWH and A2918SWV motor drivers are designed
OUT1A 1
OUT2A 2
E2 3
OUT2B 4
to drive both windings of a bipolar stepper motor or bidirectionally
control two dc motors. All bridges are capable of sustaining 45 V and
include internal pulse-width modulation (PWM) control of the output
current to 1.5 A.
LOAD SPLY 5
For PWM current control, the maximum output current is
SENSE2 6
ENABLE2 7
PHASE2 8
TRC2 9
CGROUND 10
U .LOGIC SPLY 11
YRC1 12
PHASE1 13
D LENABLE1 14
O NREFERENCE 15
nSENSE1 16
R O igOUT1B 17
P sE1 18
D CE deDwg.PP-051
E N wABSOLUTE MAXIMUM RATINGS
eat TJ +150°C
U E nMotor Supply Voltage, VBB . . . . . . . . . 45 V
IN R rOutput Current, IOUT (tw20 µs) . . ±1.75 A
T E fo(Continuous) . . . . . . . . . . . . . . ±1.5 A
Logic Supply Voltage, VCC . . . . . . . . . 7.0 V
N F BLogic Input Voltage Range,
E EVIN . . . . . . . . . . . . . . . -0.3 V to +7.0 V
O R 7Output Emitter Voltage, VE . . . . . . . . . 1.5 V
C 1Package Power Dissipation,
PD . . . . . . . . . . . . . . . . . . . . See Graph
IS R 9Operating Temperature Range,
2TA . . . . . . . . . . . . . . . . -20°C to +85°C
D O NStorage Temperature Range,
F DTS . . . . . . . . . . . . . . . -40°C to +150°C
Output current rating may be limited by duty cycle,
Uambient temperature, and heat sinking. Under
any set of conditions, do not exceed the specified
epeak current rating or a junction temperature of
Us+150°C.
determined by the user’s selection of a reference voltage and sensing
resistor. A PHASE input to each bridge determines load current
direction. Active low ENABLE inputs control the four drivers in
each bridge.
The bridges include both ground clamp and flyback diodes for
protection against inductive transients. Internally generated delays
prevent cross-over currents when switching current direction.
Special power-up sequencing is not required. Thermal protection
circuitry disables the outputs if the chip temperature exceeds safe
operating limits.
The A2918SWH/V are supplied in an 18-lead power-tab package
with staggered lead forming. The tab is internally insulated from the
device and requires no external isolation. The A2918SWH/V are
available for operation from -40°C to +85°C. To order, change the
suffix from 'S–' to 'E–'. These devices are also available on special
order for operation to +125°C.
FEATURES
I ±1.5 A Continuous Output Current
I 45 V Output Sustaining Voltage
I Internal PWM Current Control
I Low Output Saturation Voltage
I Internal Clamp Diodes
I Internal Thermal Shutdown Circuitry
I Similar to Dual PBL3718 or Dual PBL3770
Always order by complete part number:
Part Number Application
A2918SWH For Horizontal Mount
A2918SWV For Vertical Mount

1 page




2918 pdf
General
To avoid excessive voltage spikes on the
LOAD SUPPLY pin (VBB), a large-value
capacitor (47 µF) should be connected from
VBB to the ground pin as close as possible to
the device. Under no circumstances should
the voltage at VBB exceed 45 V.
The PHASE input to each bridge
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.
All four drivers in the bridge output can
be turned OFF, with VEN 2.4, resulting in
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.
Varying the reference voltage (VREF)
provides continuous control of the peak load
current.
Thermal protection circuitry turns OFF all
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.
www.allegromicro.com
2918
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
LOAD CURRENT PATHS
VBB
BRIDGE ON
RS SOURCE OFF
ALL OFF
Dwg. EP-006-1
The products described here are manufactured in Japan by Sanken
Electric Co., Ltd. for sale by Allegro MicroSystems, Inc.
Sanken Electric Co., Ltd. and Allegro MicroSystems, Inc. reserve the
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.
These products are not authorized for use as critical components in
life-support appliances, devices, or systems without express written
approval.
The information included herein is believed to be accurate and
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.

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