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SI-7321M Datasheet(PDF) 7 Page - Sanken electric |
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SI-7321M Datasheet(HTML) 7 Page - Sanken electric |
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7 / 19 page  7 SANKEN ELECTRIC CO., LTD. Unipolar 2-Phase Microstepping Motor Driver IC SI-7321M 28210.05 Protection Circuits Operation Iocp I O Flag Motor coil short-circuit Protection Flag V O V O V O V O (PWM) V DSS Motor coil disconnection Protection PWM pulse PWM pulse PWM pulse topp topp topp The protection functions could operate even if the fault has not occurred; for example, if the load has not actually been discon- nected. This can happen when the negative edge of the PWM pulse occurs after the Load Disconnection Undetected Time, topp , because the negative edge has been boosted by the surge noise generated after PWM is turned off (center panel). It can also occur when the rise time of the pulse is delayed long enough that topp occurs before the pulse has reached full amplitude (right panel). To prevent this, please evaluate the application design to opti- mize inductance of the motor harness and PCB traces so that the transmission and slew rates of the output pulse enable it to be completed before topp has expired. The problem does not arise when the negative edge of the pulse fails to transition the full pulse amplitude. Moreover, the device may continue in normal operation if a surge suppressor capacitor is connected between the output pins (Ox) and power ground. Load Short Fall time delayed Ideal pulse duration Rise time delayed Load Open |
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