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A3972 Datasheet(PDF) 3 Page - Allegro MicroSystems |
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A3972 Datasheet(HTML) 3 Page - Allegro MicroSystems |
3 / 10 page Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Dual DMOS Full-Bridge Microstepping PWM Motor Driver A3972 3 FUNCTIONAL BLOCK DIAGRAM Copyright © 2000, Allegro MicroSystems, Inc. CONTROL LOGIC REGULATOR UVLO AND FAULT DETECT OUT1A SENSE1 GATE DRIVE CHARGE PUMP VREG CP1 CP2 VCP VBB1 BANDGAP OSC SERIAL PORT CLOCK DATA STROBE OUT1B 0.22 μF +- VDD PHASE 1/2 SYNC. RECT. MODE SYNC. RECT. DISABLE MODE 1/2 0.22 μF 0.22 μF REF OUT2A VBB2 OUT2B SENSE2 PROGRAMMABLE PWM TIMER FIXED-OFF BLANK MIXED DECAY PROGRAMMABLE PWM TIMER FIXED-OFF BLANK MIXED DECAY 6-BIT LINEAR DAC +- SENSE1 VCP 2 V 2 V GROUND MUX OSCILATOR OSC SELECT/ DIVIDER BUFFER 0.1 μF SLEEP DMOS H-BRIDGE DMOS H-BRIDGE 15 14 24 11 12 10 23 13 17 21 16 20 8 4 9 5 1 3 2 22 6 7 18 19 LOAD SUPPLY LOGIC SUPPLY 0.1 μF Dwg. FP-050-1 6 6 6-BIT LINEAR DAC |
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