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DRV8912-Q1: Would you please recommend a part similar to NCV7608 for a pinch valve application?

Adam Torma
Mastermind 45420 points
Part Number: DRV8912-Q1
Other Parts Discussed in Thread: DRV8962

e2e,

I'm using NCV7608 for a pinch valve application but running into issues where I'm  not getting the plunger to open to drain liquid and debating using a flow sensor on the output of the cup.

 

Could you help us get some more information on the plunger movement detection using TI devices?

Thank you,

Adam

  • 0
    TI__Mastermind 22970 points

    Hey Adam,

    Do you need independent 1/2 bridge control on your motor driver?  Also what are your voltage and current requirements?

    It looks like the closest alternative device to the NCV7608 would be a 8-channel independent half-bridge integrated driver.  We don't have many of these, but the DRV8908-Q1 is the closest.  It has a 1A per output current limit, much more than the NCV7608 350mA per output.  Perhaps this higher current level would solve your issue?

    For plunger movement detection I recommend looking at our drivers with IPROPI. IPROPI is a proportional current output from the driver, basically an integrated current sensor.  You could use this IPROPI signal to ensure the plunger stalled at the location you expected it to and for other current-based detection.  The DRV8962 would be a great option with a very accurate IPROPI feedback, it has independent 1/2 bridge control and 4 outputs at 5A per output.  

    Does the plunger use a brushed DC motor inside of it?  We have a new device, DRV8234, that has sensorless position control integrated in the driver.  This would give you full feedback of the position of the DC motor in real-time, it can replace the functionality of an incremental encoder.  

    Best,

    Jacob