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SLA7024M Fiches technique(PDF) 7 Page - Allegro MicroSystems |
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SLA7024M Fiches technique(HTML) 7 Page - Allegro MicroSystems |
7 / 12 page For given values of R 1, R2, and Vb (VREF ≈ 0.82 V), Figure 3 illustrates output current as a function of current-sensing resistance (R S). Reduced/Holding Current Mode Additional circuitry (Figure 4) enables reducing motor current. The external transistor changes the voltage-divider ratio, V REF, and reduces the output current. I HOLD is determined by resistors R2 and RX in parallel: I HOLD ≈ R 2 RX • V b (3) R 1 R2 + R1 RX + R2 RX R S or I HOLD ≈ R 2’ • V b (4) R 1 + R2’ R S where R 2’ = the equivalent value of R2 and RX in parallel. FIGURE 4. HOLD CURRENT MODE FIGURE 3. CURRENT-SENSING RESISTANCE 3.0 2.0 1.0 0 1.5 2.5 3.5 0.5 CURRENT-SENSING RESISTANCE in OHMS Dwg. GK-014 1.5 2.5 0 0.5 1.0 2.0 3.0 4.0 R1 = 510 Ω R2 = 100 Ω Vb = 5 V RX = ∞ SLA7024M & SMA7029M MAX. SLA7026M MAX. Dwg. EK-010 RS V REF SENSE R 1 R 2 HOLD R 5 C 3 R X V b SLA7024M, SLA7026M, AND SMA7029M HIGH-CURRENT PWM, UNIPOLAR STEPPER MOTOR CONTROLLER/DRIVERS |
Numéro de pièce similaire - SLA7024M |
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Description similaire - SLA7024M |
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