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Sunwind Electronics Company Ltd.
Stepper Motor Driver:M542H
the OFF duration. Therefore, the average current withdrawn from power supply is considerably less than
motor current. For example, two 3A motorscan be well supplied by one power supply of 4A rating.
Multiple Drivers
It is recommended to have multiple drivers to share one power supply to reduce cost, if the supply has
enough capacity. To avoid cross interference, DO NOT daisy-chain the power supply input pins of the
drivers. (Instead, please connect them to power supply separately.)
Attention: NEVER connect power and ground in the wrong direction, as it will damage the M542H.
Selecting Supply Voltage
The power MOSFETS inside the M542H can actually operate within +20V－+100VDC, max
DC110V,including power input fluctuation and back EMF voltage generated by motor coils during motor
shaft deceleration. Higher supply voltage can increase motor torque at higher speeds, thus helpful for
avoiding losing steps. However, higher voltage may cause bigger motor vibration at lower speed, and it
may also cause over-voltage protection or even driver damage. Therefore, it is suggested to choose only
sufficiently high supply voltage for intended applications, and it is suggested to use power supplies with
theoretical output voltage of DC+20～+ 100V,max DC110V, leaving room for power fluctuation and
back-EMF.
7. Selecting Microstep Resolution and Driver Output Current
This driver uses an 8-bit DIP switch to set microstep resolution, and motor operating current, as
shown below:
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