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SLA7072M Datasheet(PDF) 9 Page - Allegro MicroSystems |
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SLA7072M Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 12 page SLA7070M, SLA7071M, SLA7072M, and SLA7073M Motor Driver ICs 9 www.allegromicro.com Stepper Motor Coil Short Circuit Coil Short Circuit Normal Operation Output Disable VM VOCP +V VREF 0 t RSInt VS VS Vg Figure 4. Motor coil short circuit protect circuit operation. Overcurrent that flows with- out passing the sense resistor is undetectable. To recover the circuit after protection oper- ates, VDD must be cycled and started up again. Protection Functions: PR Types The PR types of the SLA7070M series include a motor coil short-circuit protection circuit and a motor coil open protection circuit. They are described in this section. • Motor Coil Short-Circuit Protection (Load Short) Circuit This protection circuit, embedded in the SLA7070M series, begins to operate when the device detects an increase in the volt- age level on the sense resistor, VSInt . The voltage at which motor coil short-circuit protection starts its operation, VOCP, is set at approximately 0.7 V. The out- put is disabled at the time the protection circuit starts. In order for the motor coil short-circuit protection circuit to operate, VSInt must be greater than VOCP. Overcurrent that flows without passing the sense resistor is undetectable. To resume the circuit after protection operates, VDD must be cycled. • Motor Coil Open Protection Details of this functions is not disclosed yet due to our pat- ent policy. |
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