2918
OUT1A
OUT2A
E2
OUT2B
LOAD SPLY
SENSE 2
1
2
3
4
5
6
7
8
9
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
The A2918SWH and A2918SWV motor drivers are designed
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.
For PWM current control, the maximum output current is
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.
2
ENABLE2
PHASE2
RC2
GROUND
LOGIC SPLY
REFERENCE
ABSOLUTE MAXIMUM RATINGS
at T
J
≤
+150°C
Motor Supply Voltage, V
BB
. . . . . . . . .
45 V
Output Current, I
OUT
(t
w
≤20 µs)
. .
±
1.75 A
(Continuous) . . . . . . . . . . . . . .
±
1.5 A
Logic Supply Voltage, V
CC
. . . . . . . . .
7.0 V
Logic Input Voltage Range,
V
IN
. . . . . . . . . . . . . . .
-0.3 V to +7.0 V
Output Emitter Voltage, V
E
. . . . . . . . .
1.5 V
Package Power Dissipation,
P
D
. . . . . . . . . . . . . . . . . . . .
See Graph
Operating Temperature Range,
T
A
. . . . . . . . . . . . . . . .
-20
°
C to +85
°
C
Storage Temperature Range,
T
S
. . . . . . . . . . . . . . .
-40
°
C to +150
°
C
Output current rating may be limited by duty cycle,
ambient temperature, and heat sinking. Under
any set of conditions, do not exceed the specified
peak current rating or a junction temperature of
+150°C.
T
C .
U LY
D N
O O
gn
R
i
P E
des
D NC
w
E E
e
U R
rn
IN E
fo
T F
B
N E
E
O R
17
C R
29
IS O
N
D F
UD
—
Use
PWM 2
V
BB
Data Sheet
29319.24A
10
11
12
1
V
CC
RC1
PHASE1
13
14
15
16
17
18
PWM 1
ENABLE1
V
REF
TSD
SENSE1
OUT1B
E1
Dwg. PP-051
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
I
I
I
I
I
I
±1.5
A Continuous Output Current
45 V Output Sustaining Voltage
Internal PWM Current Control
Low Output Saturation Voltage
Internal Clamp Diodes
Internal Thermal Shutdown Circuitry
Similar to Dual PBL3718 or Dual PBL3770
Always order by complete part number:
Part Number
A2918SWH
A2918SWV
Application
For Horizontal Mount
For Vertical Mount
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
