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SLA7077MR Datasheet(PDF) 9 Page - Allegro MicroSystems |
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SLA7077MR Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 13 page SLA7075M, SLA7076M, SLA7077M, and SLA7078M Motor Driver ICs 9 www.allegromicro.com SLA7060M Series SLA7070M Series VBB RSExt RSInt VS VS VS FET Gate Signal FET Gate Signal Vg Stepper Motor Stepper Motor VBB Ioff Ion Ioff Ion VS Vg Vg Vg Vg Vg PWM On PWM Off PWM On Back EMF at Dead Time Vg +V VREF 0 t Vg +V VREF 0 0 0 t t t PWM On PWM Off PWM On Dead Time Dead Time Figure 3. Synchronous rectification operation. During Dead Time, the Back EMF flows through the body diode of the MOSFET PWM Off Period The PWM off-time for the SLA7070M series is controlled as a fixed time by an internal oscillator. It also is switched in 3 levels by current proportion (see the Electrical Characteristics table). In addition, the SLA7070M series provide a function that decreases losses occurring when the PWM turns off. This func- tion dissolves back EMF stored in the motor coil at MOSFET turn-on, as well as at PWM turn-on (synchronous rectification operation). Figure 3 shows the difference in back EMF generative system between the SLA7060M series and SLA7070M series. The SLA7060M series performs on–off operations using only the MOSFET on the PWM-on side, but the SLA7070M series also performs on–off operations using only the MOSFET on the PWM-off side. To prevent simultaneous switching of the MOS- FETs at synchronous rectification operation, the IC has a dead time of approximately 0.5 μs. During dead time, the back EMF flows through the body diode on the MOSFET. |
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Similar Description - SLA7077MR |
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