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SLA7026 Datenblatt(PDF) 9 Page - Allegro MicroSystems |
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SLA7026 Datenblatt(HTML) 9 Page - Allegro MicroSystems |
9 / 12 page V b DETERMINING THE MOTOR PWM FREQUENCY The modules function asynchronously, with PWM OFF time fixed by R 3 and C 1 at input td. The OFF time can be calculated as: t OFF ≈ -R3 • C1 • logn (1 - 2 ) (5) Recommended circuit constants and t OFF are: V b = 5 V R 3 = 47 kΩ C 1 = 470 pF t OFF = 12 µs FIGURE 7. PWM FREQUENCY vs MOTOR RESISTANCE POWER DISSIPATION CALCULATIONS Excepting high-current applications utilizing the SLA7026M above approximately 2.0 A at +65 °C (with 2-phase operation), the need for heat sinks is rare. The basic constituents of conduction losses (internal power dissipation) include: (a) FET output power dissipation (I OUT 2 • r DS(on) or IOUT • VDS(ON)), (b) FET body diode power dissipation (V SD • IOUT), and (c) control circuit power dissipation (V CC • ICC). Device conduction losses are calculated based on the operating mode (wave drive, half-step, or 2-phase). Assuming a 50% output duty cycle: Wave Drive = 0.5 (I OUT 2 • r DS(on)) + 0.5 (VSD • IOUT) + (VCC • 15 mA) Half-Step = 0.75 (I OUT 2 • r DS(on)) + 0.75 (VSD • IOUT) + (VCC • 15 mA) 2-Phase = (I OUT 2 • r DS(on)) + (VSD • IOUT) + (VCC • 15 mA) 40 20 0 6 10 14 10 MOTOR RESISTANCE in OHMS Dwg. GK-016 30 50 0 24 8 12 RS = 1 Ω L/R = 1 to 3 ms 20 25 30 35 40 VCC = 24 V VCC = 36 V SLA7024M, SLA7026M, AND SMA7029M HIGH-CURRENT PWM, UNIPOLAR STEPPER MOTOR CONTROLLER/DRIVERS |
Ähnliche Teilenummer - SLA7026 |
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Ähnliche Beschreibung - SLA7026 |
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