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SLA7024 Datasheet(PDF) 6 Page - Allegro MicroSystems |
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SLA7024 Datasheet(HTML) 6 Page - Allegro MicroSystems |
6 / 12 page 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 ™ SLA7024M, SLA7026M, AND SMA7029M HIGH-CURRENT PWM, UNIPOLAR STEPPER MOTOR CONTROLLER/DRIVERS FIGURE 2. PWM CONTROL (RUN MODE) Dwg. EK-009 V INPUT PEAK CURRENT DETECTOR CONTROL LOGIC S V BB V CC CURRENT CONTROL & RECIRCULATING CURRENT CONTROL R 2 R 1 R AA B B R 5 C 3 R 3 C 1 REF V t d PWM OFF-TIME CONTROL SENSE b APPLICATIONS INFORMATION REGULATING THE PWM OUTPUT CURRENT The output current (and motor coil current) waveform is illustrated in Figure 1. Setting the PWM current trip point requires various external components: V b = Reference supply (typically 5 V) R 1, R2 = Voltage-divider resistors in the reference supply circuit R S = Current sensing resistor(s) NOTE: The maximum allowable V REF input voltage is 2.0 V. The voltage-divider must be selected accordingly. Normal PWM (Full-Current/Running) Mode I OUT is set to meet the specified running current for the motor (Figure 2) and is determined by: I OUT ≈ V REF (1) R S or, if V REF is not known I OUT ≈ R 2 • V b (2) R 1 + R 2 R S FIGURE 1. PHASE A COIL CURRENT WAVEFORM Dwg. WK-001 PHASE A PHASE A 0 I OUT |
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