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Question regarding DRV8860 drtive capacity

Arun Sharma19
Prodigy 220 points
Other Parts Discussed in Thread: DRV8860, DRV8860EVM

Hi,

I am using DRV8860 in my design to drive 8 valves. These valves consume a current of 500mA during pick up and during hold, I can maintain them at 40% (200mA). One strange observation I made about the DRV8860EVM (evam module) is that the module can't drive more than 5 valves in the method of individually activate each valve the bring it to hold before activating the next valve. DRV8860 on my board can drive all 8 valves in this method but not the one on EVM. any specific reason for the behavior? I have tried this on two modules but observed same behavior. Anyone observed this behavior?

  • 0
    TI__Guru** 114905 points
    Hi Arun,

    Can you provide some additional information?
    What happens when you try more than 5 valves? Does the nFAULT signal assert? This may be an indication of thermal issues.
    What is your ambient temperature?
    Can you provide a scope capture of the current through the solenoid?

    We will investigate on our side.
  • 0 in reply to Rick Duncan
    TI__Mastermind 26065 points
    Hi Arun,

    I remember tested on DRV8860 EVM with 8 channel on together with 200mA each. As Rick said, did you see an obviously over heat of the device when you active to 5 or more relays. How much difference of the boards, EVM and yours?

    Best regards,
  • 0 in reply to Wilson Zuo
    Prodigy 220 points
    Thanks Rick and Wilson.

    I did not observe any overheat of on the IC. I tested in the lab environment with 23degC ambient. i did not check the nFault signal. I will check and provide the scopeshot also.