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- Both regulated and unregulated power supplies can be used to supply the driver. However,
- unregulated power supplies are preferred due to their ability to withstand current surge. If regulated
- power supplies (such as most switching supplies.) are indeed used, it is important to have large
- current output rating to avoid problems like current clamp, for example using 4A supply for 3A
- motor-driver operation. On the other hand, if unregulated supply is used, one may use a power supply
- of lower current rating than that of motor (typically 50%~70% of motor current). The reason is that
- the driver draws current from the power supply capacitor of the unregulated supply only during the
- ON duration of the PWM cycle, but not during the OFF duration. Therefore, the average current
- withdrawn from power supply is considerably less than motor current. For example, two 3A motors
- can be well supplied by one power supply of 4A rating.
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