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A3973KB Datasheet(PDF) 2 Page - Allegro MicroSystems |
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A3973KB Datasheet(HTML) 2 Page - Allegro MicroSystems |
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2 / 5 page  Page 2 of 5 3976 Dual Protected PWM Motor Driver Functional Block Diagram (one of two bridges shown) CONTROL LOGIC Diagnostic Logic OUT1A V BB OUT1B V CC GROUND PHASE1 ENABLE1 To Bridge 2 To Bridge 2 OUT2A OUT2B PHASE2 ENABLE2 FAULT1 FAULT2 Thermal Shutdown Short to Supply Monitor Short to Ground Monitor Over/Under Voltage Monitor Input Pull Down Input Logic PHASE ENABLE OUTA OUTB X 0 Off Off 0 1 Low High 1 1 High Low Fault Logic Fault Condition FAULT1 FAULT2 Thermal Shutdown Low Low Short to Battery or Open Load Low High Short to Ground High Low Normal Operation High High |
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