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DRV8825 burning out

HPB
Expert 1350 points
Other Parts Discussed in Thread: DRV8825

I have a laser cutter/engraver that uses a DRV8825 driver. However, the chips seem to be burning out really quickly. For my Y-axis I have two motors that rotate in opposite directions to get the axis beam moving. However, both these motors are being driven by one driver. The current limit however accounts for this and is set to limit twice of each motor (1A for each motor). Could this be why these are burning out? I have attached a schematic of my drivers. Vin is 12V, 5A. All STEP_ENABLE's are tied together. Also are the 0.1u caps on the sense resistors absolutely necessary? 

DRV8825-DRV8825.pdf

  • 0
    TI__Guru** 114905 points
    Hi HPB,

    Can you confirm the schematic? There should be a single 0.1uF capacitor between VCP and VM. The schematic show two additional 0.1uF plus a 100uF. The additional capacitors should be connected between VMA/VMA and GND.

    Is there a problem with all three locations? If not, which location(s) is suspect?
  • 0 in reply to Rick Duncan
    Expert 1350 points

    Thank you for pointing that out. Looks like I made an error there. Yes the 100u and 0.1u are connected between VCP and VMA/B when they should've been between VMA/B and GND. Strangely connecting a single motor to a single driver still worked though. 

    Would it still be ok to drive two motors from one DRV8825 provided the current limit is set to twice the rating of one motor (and as long as its within the limits of DRV8825)?