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DRV8353RS-EVM: Isolation of DRV8353RS gate driver

Prodigy 30 points

Replies: 6

Views: 79

Part Number: DRV8353RS-EVM

Is the gate driver DRV8353R isolated or not? If not, What are the impacts of using it without isolation and how can we provide external protection or isolation.

  • Shaza,

    Thanks for posting on the MD forum!

    The device is not isolated. Which nodes are you wanting to isolate?

    Regards,

    -Adam

  • In reply to Adam Sidelsky:

    Thank you for replying,

    I want to understand, is the MCU ground isolated from the system ground; and if not, what is the effect of this?

  • In reply to Shaza Hany:

    Shaza,

    The DRV GND is connected directly to the FET bridge GND. You can isolate the MCU from the rest of the system if you choose.

    The reason the DRV is connected directly to the FET bridge is because this is how the DRV monitors the FETs and also how the DRV drives current into the FET gates and similar.

    Regards,

    -Adam

  • In reply to Adam Sidelsky:

    Do you have any recommendations for isolating the MCU?

  • In reply to Shaza Hany:

    Shaza,

    I will forward your post to the isolation team.

    Regards,

    -Adam

  • In reply to Adam Sidelsky:

    Adam,

    We have digital isolators capable of isolating the 12 digital signals between the MCU and DRV. Unfortunately our digital isolators would not be able to isolate the current sense amp outputs (SOA, SOB, and SOC). For the isolating the digital signals, I recommend using two ISO7761 devices. Are you familiar with digital isolation in regards to PCB design and power supply?

    Respectfully,

    Lucas