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3974 Datasheet(PDF) 2 Page - Allegro MicroSystems |
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3974 Datasheet(HTML) 2 Page - Allegro MicroSystems |
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2 / 12 page  3974 DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 2 FUNCTIONAL BLOCK DIAGRAM Copyright © 2001 Allegro MicroSystems, Inc. CHARGE PUMP BANDGAP VDD CREG TSD UNDER- VOLTAGE & FAULT DETECT CHARGE PUMP BANDGAP REGULATOR VDD VBB1 + LOGIC SUPPLY VREG LOAD SUPPLY1 SLEEP MODE CONTROL LOGIC PROGRAMMABLE PWM TIMER SENSE1 RS1 FIXED OFF BLANK DECAY ENABLE1 OSC CLOCK DATA STROBE REFERENCE BUFFER & DIVIDER OUT1A OUT1B REF1 VREF CS1 PROGRAMMABLE PWM TIMER FIXED OFF BLANK DECAY Dwg. FP-048-1 CONTROL LOGIC SENSE2 RS2 ENABLE2 REFERENCE BUFFER & DIVIDER OUT2A OUT2B REF2 VREF2 CS2 VBB2 LOAD SUPPLY2 + SERIAL PORT CHARGE PUMP TO PWM TIMER ZERO CURRENT DETECT CURRENT SENSE ZERO CURRENT DETECT CURRENT SENSE |
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