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SLA7081MPR Datasheet(PDF) 9 Page - Sanken electric |
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SLA7081MPR Datasheet(HTML) 9 Page - Sanken electric |
9 / 18 page 9 SANKEN ELECTRIC CO., LTD. 28610.23, Rev. 1 Unipolar 2-Phase Stepping Motor Driver ICs SLA7080M Series open circuit condition, the SLA7080M protection function also provides a fixed delay, topp, before the device shuts down the outputs. This is to avoid false detections based on ringing after PWM turn-off. Referring to figure 6, if the breakdown confirma- tion interval (3 breakdown cycles) plus ringing effects are shorter than topp , the protection circuit functions correctly. However, if ringing causes the total period to exceed topp, false detections can occur. If this is the case, check the motor and wiring layout to reduce ringing. Variation among device variants and applications should be taken into consideration. One possible solution is the addition of a capacitor between the OUTx and GND pins, which could damp the ringing sufficiently to allow continuation of nor- mal operation when there is no actual avalanche breakdown. Synchronous Rectification A dead time, approximately 0.5 μs, is set to prevent simultane- ous turn-on of the MOSFETs at switching during synchronous rectification. During the dead time, the regenerating current flows through the body diode on each MOSFET chip, as shown in figure 7. Power Supply There is no restriction on the on/off sequencing of the main power supply, VBB, and the logic supply, VDD. Because the SLA7080M series has a structure that separates the Control IC (MIC) with the power MOSFET of the output stage, the motor power supply and the main power supply are electrically separated. Therefore, it is possible to drive the device by using different voltages for motor power supply and main power supply. Note that the power sup- plies have different voltage ranges. Figure 6. Alternative topp scenarios: (A) no ringing, breakdown confirmed after three cycles, (B) ringing plus three cycles is less than topp with no effect on operations, and (C) ringing is greater than topp generates false detections of breakdowns tOPP tCONFIRM tCONFIRM tCONFIRM tOPP tOPP VOUT VDSS (A) (B) (C) Figure 7. Synchronous rectification operation SLA7080M 0 VREF 0 0 VG VG PWM On tDEAD tDEAD PWM On PWM Off VG VG Stepper Motor Back EMF during dead time Normal current VRS RS ION IOFF VRS |
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