Product specs:
  • 48VDC max input
  • 3 AMPS peak output
  • Supports 1, 1/2, 1/4, 1/8, 1/16 and 1/32 microsteps
  • Advanced Dynamic Mixed Decay feature
  • Thermal shutdown temp: 150C
  • Fault LED for over temp, overload and short circuit events

  • Static sensitive devices -  Remove from anti-static packaging only when ready to install
  • Burn / Injury warning - Device surface and heatsink could reach temperatures that could burn and injure. Allow devices to cool before touching.
  • Possible Fire Hazard -  Do not leave drivers running unattended, to be installed by knowledgeable individuals only. 
  • Damage to device - Power off main supply before attempting to install or detach module. Avoid cutting off at DC source while motors are running. Do not disconnect motors from main board while powered. Observe correct orientation when mounting module.

Installation Guide:

 # Setting Micro stepping jumpers: 

The BSD109A uses jumper pins M1, M2 and M3 to set the micro stepping up to 1/32. Chart below shows jumper settings. OFF= No Jumper and ON=with Jumper.

Example: Set to 1/6 micro-steps with jumper on M3 and leave M1 and M2 open.

# Setting Current Limit

Peak current can be calculated using formula

I = Vref x 2  


Vref = I / 2

[where "I" is the current limit and "Vref" is the voltage set by the on-board trim pot, external vref can be fed to the Vref pin as shown above]

The Vref voltage can be measured by a voltmeter with the +lead going to the top of the trimmer (rotating crown) or the Vref jumper pins and ground lead goes to any ground pin on the host controller.

Example: To set current limit at 1 AMP, what is the required Vref setting?

Vref = I / 2 = 1/2 = 0.5volts

NOTE: It is common practice to initially set the current limit to a lower value that would allow your motors to move without skipping steps. It's a good to start with 50% or lower of your motor's max current rating then adjust accordingly. 

# Vref Jumper------------------------------------------------------------------

The Vref jumper is used to disconnect the on-board trim pot and allow an external vref source to control the current setting either from a Digital pot or other voltage source. Controllers like the Gradus M1 PRO does not have digipots so the Vref jumper has to be in place for manual Vref adjustment through the on-board trim pot.

PRECAUTION: New upcoming controller boards from Panucatt Devices that will feature the bigfoot profile drivers will most likely have Digital pots to control Vref in firmware. Make sure the Vref jumper is removed when using this driver as it will affect the current limit setting and cause motors and drivers to overheat.

# Heatsink mounting and heat management: ------------------------------------------------------------------

  • Supplied heat sink must be mounted for current setting 1.5 Amps and above. Forced air cooling is required for current setting 2.5 Amps and above
  • Keep wiring away from heat sink and driver surface to prevent shorts and wire insulation burns.
  • Allow ample space around the drivers for adequate airflow.