2918 Datasheet, PDF (1/8 Pages) Allegro MicroSystems – DUAL FULL-BRIDGE PWM MOTOR DRIVER

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
T _{RC2 9}
C _{GROUND 10}
U ^{. LOGIC SPLY 11}
Y _{RC1 12}
PHASE1 13
D L _{ENABLE1 14}
O ^N _{REFERENCE 15}
n _{SENSE1 16}
R O _{ig OUT1B 17}
P ^s _{E1 18}
D CE ^de _Dwg.PP-051
E _N ^w _{ABSOLUTE MAXIMUM RATINGS}
e _{at TJ ≤ +150°C}
U E _{n Motor Supply Voltage, VBB . . . . . . . . . 45 V}
IN ^{R r} _{Output Current, IOUT (tw≤20 µs) . . ±1.75 A}
T ^{E fo (Continuous) . . . . . . . . . . . . . . ±1.5 A}
Logic Supply Voltage, V_CC . . . . . . . . . 7.0 V
N ^{F B} Logic Input Voltage Range,
E _{E VIN . . . . . . . . . . . . . . . -0.3 V to +7.0 V}
O _R 7 _{Output Emitter Voltage, VE . . . . . . . . . 1.5 V}
C ^{1 Package Power Dissipation,}
P_D . . . . . . . . . . . . . . . . . . . . See Graph
IS ^{R 9 Operating Temperature Range,}
2 _{TA . . . . . . . . . . . . . . . . -20°C to +85°C}
D ^{O N Storage Temperature Range,}
F ^{D TS . . . . . . . . . . . . . . . -40°C to +150°C}
Output current rating may be limited by duty cycle,
U _{ambient temperature, and heat sinking. Under}
any set of conditions, do not exceed the specified
— ^{e peak 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