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A3988 Datasheet(PDF) 10 Page - Allegro MicroSystems |
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A3988 Datasheet(HTML) 10 Page - Allegro MicroSystems |
10 / 14 page Quad DMOS Full Bridge PWM Motor Driver A3988 10 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com The two input capacitors should be placed in parallel, and as close to the device supply pins as possible. The ceramic capaci- tor should be closer to the pins than the bulk capacitor. This is necessary because the ceramic capacitor will be responsible for delivering the high frequency current components. Sense Pins The sense resistors, RSx, should have a very low impedance path to ground, because they must carry a large cur- rent while supporting very accurate voltage measurements by the current sense comparators. Long ground traces will cause additional voltage drops, adversely affecting the ability of the comparators to accurately measure the current in the windings. As shown in the layout below, the SENSEx pins have very short traces to the RSx resistors and very thick, low impedance traces directly to the star ground underneath the device. If possible, there should be no other components on the sense circuits. Note: When selecting a value for the sense resistors, be sure not to exceed the maximum voltage on the SENSEx pins of ±500 mV. |
Similar Part No. - A3988_11 |
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Similar Description - A3988_11 |
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