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DRV8162: Sharing the configuration resistors when using more than one driver

Nicolas Murguizur
Prodigy 210 points
Part Number: DRV8162

Tool/software:

Hi,

I want to use 2x DRV8162 for driving a full bridge.

The device requires some resistors for configuring mode, deadtime, etc.

Can I use a single resistor to configure, both devices? I want the deatime, mode, driving current and VDS monitoring to be the same in both hald bridges and would like to understand if I can save some components. The circuit diagram in the datasheet does not clarify whether the same component can be used. I assume there's a current source as drawn to know what resistor has been used. If that were the case then a resistor should be used for each driver.

  • +1
    TI__Mastermind 23676 points

    Hey Nikolas,

    Your assumption is correct for a current source on the pin. On an initial look I don't see much concern with doing this for Idrive and VDS pin (provided resistor value is halved). The DT/Mode pin has linear mode and would not recommend single resistor for both drivers.

    These resistors are assumed to be placed close the the driver. So will this be the case in your layout? To prevent issue with noise coupling. 

    Also resistors should be fairly low cost, what is the main challenge with individual components per driver? I can also try to check with my team on their concerns with this approach.

    May I also know what is the driver being used to control/end application?

    Best,

    Akshay

  • 0 in reply to Akshay Rajeev Menon
    Prodigy 210 points

    Hi Akshay,

    The resistors will be of course close to the driver.

    The concern is mainly due to area, including the optional capacitor, it's 8 components. 

    The end application is a DC/DC converter.

    Please check with your team on any additional think to consider.

    Regards

  • 0 in reply to Nicolas Murguizur
    TI__Mastermind 23676 points

    Hey Nicolas,

    Understood. Will update once I am able to check with the team.

    Best,

    Akshay

  • +1 in reply to Akshay Rajeev Menon
    TI__Mastermind 23676 points

    Hey Nicolas,

    I was able to check with the design team, and the guidance is to have individual resistors per device. There is a timing element to how the hardware setting is latched in the device, therefore, it is possible that the two devices don't end up sharing the same setting with the earlier approach. Please ignore my earlier suggestion and design with individual resistors for the devices.

    Best,

    Akshay