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A3906 Datasheet(PDF) 8 Page - Allegro MicroSystems |
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A3906 Datasheet(HTML) 8 Page - Allegro MicroSystems |
8 / 10 page Low Voltage Stepper and Single/Dual DC Motor Driver A3906 8 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Parallel Operation The A3906 can be paralleled for applica- tions that require higher output currents. In paralleled mode the driver can source 2 A continuous. The A3906 has two completely independent bridges with separate overcurrent latches. This allows the device to supply two separate loads, and as a result, when paralleled it is imperative that the internal current control is disabled by shorting the sense pins to ground. Because the overcurrent trip threshold is internally fixed at 0.2 V, the trace resistance must be kept small so the internal current latch is not triggered prematurely. With acceptable margin, the voltage drop across the trace resistance should be under 0.1 V. At a peak current of 2.5 A, the trace resistance should be kept below 40 mΩ to prevent false tripping of the overcurrent latch. Each bridge has some variation in propagation delay. During this time it is possible that one bridge will have to support the full load current for a very short period of time. Propagation delays are characterized and guard banded to protect the driver from damage during these events. Layout The printed circuit board should use a heavy ground- plane. For optimum electrical and thermal performance, the A3906 must be soldered directly onto the board. On the under- side of the A3906 package is an exposed pad, which provides a path for enhanced thermal dissipation. The thermal pad should be soldered directly to an exposed surface on the PCB. Thermal vias are used to transfer heat to other layers of the PCB. Grounding In order to minimize the effects of ground bounce and offset issues, it is important to have a low impedance single- point ground, known as a star ground, located very close to the device. By making the connection between the exposed thermal pad and the ground plane directly under the A3906, that area DC Motor Operation (Parallel Bridge) IN1/IN3 IN2/IN4 OUT1A/2A OUT1B/2B Function 0 0 OFF OFF Disabled 1 0 H L FOR 0 1 L H REV 1 1 L L BRAKE OUT1A OUT1B OUT2A OUT2B VBB GND IN1 IN2 IN3 10 μF 10 V IN4 SENSE2 SENSE1 FL1 FL2 0.1 μF 0.1 μF A3906 0.1 μF SLEEP |
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Similar Description - A3906_16 |
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