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SLA7026 数据表(PDF) 8 Page - Allegro MicroSystems |
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SLA7026 数据表(HTML) 8 Page - Allegro MicroSystems |
8 / 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 For given values of R 1, R2, and Vb (VREF ≈ 0.82 V), Figures 5A and 5B illustrate output holding current as a function of R X for two values of current- sensing resistance (R S). 1.0 0.6 0 0 300 500 HOLDING-CURRENT RESISTANCE in OHMS Dwg. GK-015 100 200 400 600 R1 = 510 Ω R2 = 100 Ω Vb = 5 V RS = 0.8 Ω RS = 1.0 Ω 0.8 0.4 0.2 FIGURE 5A. HOLD-CURRENT RESISTANCE (SLA7024M and SMA7029M) NOTE: Holding current determines holding torque, which is normally greater than running torque. Consult motor manufacturer for recommended safe holding current and motor winding temperature limits in “standstill” or “detent” mode. FIGURE 5B. HOLD-CURRENT RESISTANCE (SLA7026M) The MOSFET outputs create ringing noise with PWM, but the RC filter precludes malfunctions. The comparator operation is affected by R 5 and C3 and, thus, current overshoot is influenced by component values. Empirical adjustment to “fine-tune” the current limit is likely. 3.0 2.0 1.0 0 300 500 700 0.5 HOLDING-CURRENT RESISTANCE in OHMS Dwg. GK-015-1 1.5 2.5 0 100 200 400 600 800 R1 = 510 Ω R2 = 100 Ω Vb = 5 V RS = 0.33 Ω RS = 0.47 Ω |
类似零件编号 - SLA7026 |
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类似说明 - SLA7026 |
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