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A3969 Datasheet(PDF) 1 Page - Allegro MicroSystems

Part No. A3969
Description  Dual Full-Bridge PWM Motor Driver
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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A3969 Datasheet(HTML) 1 Page - Allegro MicroSystems

   
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Description
The A3969 is designed to drive both windings of a two-phase
bipolar stepper motor. The device includes two H-bridges
capable of continuous output currents of ±650 mAand operating
voltages to 30 V. Motor winding current can be controlled by
the internal fixed-frequency, pulse-width modulated (PWM),
current-control circuitry. The peak load current limit is set by
the user’s selection of a reference voltage and current-sensing
resistors.
The fixed-frequency pulse duration is set by a user-selected
external RC timing network. The capacitor in the RC timing
network also determines a user-selectable blanking window that
prevents false triggering of the PWM current-control circuitry
during switching transitions.
To reduce on-chip power dissipation, the H-bridge power
outputs have been optimized for low saturation voltages. The
sink drivers feature the Allegro® patented Satlington® output
structure. The Satlington outputs combine the low voltage drop
of a saturated transistor and the high peak current capability
of a Darlington.
DS3969
Features and Benefits
▪ ±650 mA Continuous Output Current
▪ 30 V Output Voltage Rating
▪ Internal Fixed-Frequency PWM Current Control
▪ Satlington Sink Drivers
▪ User-Selectable Blanking Window
▪ Internal Ground-Clamp and Flyback Diodes
▪ Internal Thermal-Shutdown Circuitry
▪ Crossover-Current Protection and UVLO Protection
Dual Full-Bridge PWM Motor Driver
Continued on the next page…
Package: 28 pin QFN (suffix ET)
Typical Application
Approximate scale
A3969
Continued on the next page…
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LOGIC
LOGIC
VBB
0.5 Ω
0.5 Ω
56 kΩ
10 kΩ
20 kΩ
EN1
EN2
PH1
PH2
+3.3 V
+3.3 V
+24 V
47 μF
680 pF


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