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A4973 Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A4973 Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 11 page Full-Bridge PWM Motor Driver A4973 9 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com ensure that the maximum ratings of the device are not exceeded. If the internal fast current-decay control circuitry is used, then the load current will regulate to a value given by: ILOAD = VREF / (RS × 2) CAUTION: In fast current-decay mode, when the direction of the motor is changed abruptly, the kinetic energy stored in the motor and load inertia will be converted into current that charges the VBB supply bulk capacitance (power supply output and decoupling capacitance). Care must be taken to ensure that the capacitance is sufficient to absorb the energy without exceeding the voltage rating of any devices connected to the motor supply. See also the Brake Operation section, above. Soldering Considerations. The lead (Pb) free (100% matte tin) plating on lead terminations is 100% backward- compatible for use with traditional tin-lead solders of any composition, at any temperature of soldering that has been traditionally used for that tin-lead solder alloy. Further, 100% matte tin finishes solder well with tin-lead solders even at temperatures below 232°C. This is because the matte tin dissolves easily in the tin-lead. Additional information on soldering is available on the Allegro Web site, www.allegromicro.com. Figure 4 — Typical Application VCC VBB VBB LOGIC 47 F 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 V BB MODE PHASE ENABLE BRAKE +5 V REF |
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