A3995 Allegro MicroSystems, A3995 Datasheet
A3995
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A3995 Summary of contents
Page 1
... Microcontroller or Controller Logic A3995DS Description The A3995 is designed to drive two dc motors at currents up to 2.4 A. Capable of drive voltages the A3995 includes two independent fixed off-time PWM current regulators that operate in either fast or slow decay mode, as determined by the MODE input. Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation ...
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... A3995 Selection Guide Part Number A3995SEV-T 61 pieces per tube A3995SEVTR-T 1500 pieces per reel Absolute Maximum Ratings Characteristic Symbol Load Supply Voltage V BB Logic Supply Voltage V DD Output Current * I OUT Logic Input Voltage Range V IN SENSEx Pin Voltage V SENSEx VREFx Pin Voltage ...
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... A3995 VDD OSC MODE1 PHASE1 ENABLE1 Sense1 VREF1 3 MODE2 PHASE2 ENABLE2 Sense2 - VREF2 3 DMOS Dual Full Bridge PWM Motor Driver Functional Block Diagram CHARGE V PUMP CP CONTROL LOGIC GATE DRIVE PWM Latch BLANKING V CP CONTROL LOGIC GATE DRIVE PWM Latch BLANKING DMOS Full Bridge 1 ...
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... A3995 ELECTRICAL CHARACTERISTICS 1 , valid at T Characteristics Load Supply Voltage Range Logic Supply Voltage Range VDD Supply Current Output On Resistance V , Outputs f Output Leakage VBB Supply Current Control Logic Logic Input Voltage Logic Input Current Input Hysteresis Propagation Delay Times Crossover Delay Blank Time ...
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... A3995 Logic Timing Diagram, DC Driver ENB PH MODE V BB OUTA OUTB OUT 0 A OutA A Charge Pump and VREG Power-up Delay ( 200 µs) DMOS Dual Full Bridge PWM Motor Driver OutB ...
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... Synchronous Rectification triggered by an internal fixed off-time cycle, load current will recirculate. The A3995 synchronous rectification feature will turn on the appropriate MOSFETs during the current decay. This effectively shorts the body diode with the low R significantly lowers power dissipation ...
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... Figure 5. Printed circuit board layout with typical application circuit, shown at right. The copper area directly under the A3995 (U1) is soldered to the exposed thermal pad on the underside of the device. The thermal vias serve also as electrical vias, connecting it to the ground plane on the other side of the PCB , so the two copper areas together form the star ground. ...
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... A3995 Terminal List Table Number – DMOS Dual Full Bridge PWM Motor Driver Pin-out Diagram GND MODE1 PHASE1 29 17 GND GND 30 16 PAD ...
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... A3995 Preliminary dimensions, for reference only (reference JEDEC MO-220VJJD-1, except exposed thermal pad) Dimensions in millimeters U.S. Customary dimensions (in.) in brackets, for reference only Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown ...