A2919(2010) 查看數據表（PDF） - Allegro MicroSystems
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A2919 Datasheet PDF : 8 Pages
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A2919
Dual Full-Bridge PWM Motor Driver
Features and Benefits
▪ 750 mA continuous output current
▪ 45 V output sustaining voltage
▪ Internal clamp diodes
▪ Internal PWM current control
▪ Low output saturation voltage
▪ Internal thermal shutdown circuitry
▪ Half- or quarter-step operation of bipolar stepper motors
Package: 24-pin SOIC with exposed
thermal tabs (suffix LB)
Description
The A2919 motor driver is designed to drive both windings
of a bipolar stepper motor or bidirectionally control two DC
motors. Both bridges are capable of sustaining 45 V and include
internal pulse width modulation (PWM) control of the output
current to 750 mA. The outputs have been optimized for a low
output-saturation voltage drop (less than 1.8 V total source
plus sink at 500 mA).
For PWM current control, the maximum output current is
determined by the user’s selection of a reference voltage
and sensing resistor. Two logic-level inputs select output
current limits of 0%, 41%, 67%, or 100% of the maximum
level. A PHASE input to each bridge determines load current
direction.
The bridges include both ground clamp and flyback diodes for
protection against inductive transients. Internally generated
delays prevent crossover 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.
Not to scale
Continued on the next page…
I 01 13
I1 12
PWM Control Circuitry
Channel 1
pin numbers
shown
VREF1 10
LOAD SUPPLY
24 VBB
17
OUT 1A
OUT 1B
14
60 k7
16 E1
120 k7
w10
42 k7
SENSE1
15
–
+
RC
RS
CC
ONE
SHOT
9 RC1
SOURCE
DISABLE
RT
CT
29319.21G
Dwg. EP-007-3
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