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A3986 Datasheet(PDF) 6 Page - Allegro MicroSystems |
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A3986 Datasheet(HTML) 6 Page - Allegro MicroSystems |
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6 / 16 page  Dual Full-Bridge MOSFET Driver with Microstepping Translator A3986 6 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com STEP t t tWAKE RESET tSTEPH tSTEPL SU H MSx, DIR Table 1. Microstep Resolution Truth Table MS2 MS1 Microstep Resolution 0 0 Full Step 0 1 Half Step 1 0 Quarter Step 1 1 Sixteenth Step Table 2. Mixed Decay Selection Truth Table PFD2 PFD1 Percentage of Fast decay 0 0 0% ( ≡ Slow Decay) 0 1 8% (7 cycles) 1 0 26% (23 cycles) 1 1 100% ( ≡ Fast Decay) Figure 1. Logic Interface Timing Diagram THERMAL CHARACTERISTICS Characteristic Symbol Test Conditions* Value Units Package Thermal Resistance RθJA 4-layer PCB, based on JEDEC standard 47 ºC/W 1-layer PCB with copper limited to solder pads 114 ºC/W *Additional thermal information available on Allegro Web site. |
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