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DRV8705-Q1: Copper Thickness of the PCB

sonali zodage
Intellectual 365 points
Part Number: DRV8705-Q1

Hello,

We are using a DRV8705SQRHBRQ1 motor driver IC for our application and the motor we are using has a maximum current is 15A. We used 2OZ copper thickness and tested the motor at its maximum current. However, now our manufacturer has suggested changing the 1.5OZ copper thickness instead of 2OZ.

Please let us know if this change affects the IC performance or it should be fine.

Manufacturer suggestion: Your requirement is impedance wire line width 0.13mm, we can't widen it, we suggest changing the outer copper thickness to 1.5oz, please confirm!

Thanks,

Sonali

  • 0
    TI__Mastermind 23401 points

    Hey Sonali,

    1.5oz will likely work, but it will depend on all the other conditions of your system.  With 2oz copper, what is the temperature of the device at steady state?  Run that test and that can show you how much margin you have to work with.  If the device is almost at thermal shutdown (TSD) temperature with 2oz copper then it likely won't work.  

    See Best Practices for Board Layout of Motor Drivers for other tips and optimizations on laying out boards for motor drivers. 

    Best,

    Jacob