a4950 Allegro MicroSystems, Inc., a4950 Datasheet
a4950
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a4950 Summary of contents
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... Full-Bridge DMOS PWM Motor Driver Description Designed for pulse width modulated (PWM) control of DC motors, the A4950 is capable of peak output currents to ±3.5 A and operating voltages Input terminals are provided for use in controlling the speed and direction motor with externally applied PWM control signals ...
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... A4950 Selection Guide Part Number A4950ELJTR-T 3000 pieces per 13-in. reel A4950ELJ-T 98 pieces per tube Absolute Maximum Ratings Characteristic Load Supply Voltage Logic Input Voltage Range V Input Voltage Range REF Sense Voltage (LSS pin) Motor Outputs Voltage Output Current Peak Output Current ...
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... A4950 ELECTRICAL CHARACTERISTICS Characteristics General Load Supply Voltage Range R Sink + Source Total DS(on) Load Supply Current Body Diode Forward Voltage Logic Inputs Logic Input Voltage Range V Logic Input Current Logic Input Pull-Down Resistance R RR Input Hysteresis Timing Crossover Delay V Input Voltage Range ...
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... A4950 PWM Control Timing Diagram V IN(1) IN1 V IN(0) V IN(1) IN2 V IN(0) +I REG I , OUT1 OUT2 –I REG PWM Control Truth Table IN1 IN2 10× Note: Z indicates high impedance. Full-Bridge DMOS PWM Motor Driver Characteristic Performance Forward/ Reverse/ ...
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... Low Power Standby mode disables most of the internal circuitry, including the charge pump and the regulator. When the A4950 is coming out of standby mode, the charge pump should be allowed to reach its regulated voltage (a maximum delay of 200 μs) before any PWM com- mands are issued to the device ...
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... A4950 Synchronous Rectification When a PWM off-cycle is triggered by an internal fixed off-time cycle, load current will recirculate. The A4954 synchronous rec- tification feature turns-on the appropriate DMOSFETs during the current decay, and effectively shorts out the body diodes with the low R driver. This significantly lowers power dissipation. ...
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... LSS pin of ±500 mV at maximum load. During overcurrent events, this rating may be exceeded for short durations. Ground A star ground should be located as close to the A4950 as possible. The copper ground plane directly under the exposed thermal pad GND RS ...
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... A4950 4.90 ±0.10 8 2.41 NOM 3.30 NOM 8X 0.10 C 0.51 0.31 1.27 BSC Full-Bridge DMOS PWM Motor Driver Package LJ, 8-Pin SOICN with exposed thermal pad 8° 0° 0.25 0.17 B 3.90 ±0.10 6.00 ±0.20 1.27 0.40 0.25 BSC SEATING PLANE Branded Face GAUGE PLANE C C SEATING SEATING PLANE PLANE For Reference Only; not for tooling use (reference MS-012BA) Dimensions in millimeters 1 ...
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... A4950 Copyright ©2011, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the detail spec tions as may be required to per- mit improvements in the per for mance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro’ ...