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LM5149-Q1EVM-400: Current Capability of 20A on eval board: LM5149-Q1EVM-400

Part Number: LM5149-Q1EVM-400

Hi Texas Instruments team,

We are currently customizing the evaluation board (LM5149-Q1EVM-400) for 12V and 20A output configuration.
Basically, we are de-populating some components and populating other components which sets the output current of the eval board to 20A configuration.

We wanted to know if the traces on the PCB (specifically the output section) of the eval board can handle a continuous current of 20A without any damages/incidents.

Could you please help in getting this information.
Appreciate your soonest response on this.

Best regards,

Akshay Shivakumar
ECU Platform Engineering (MS/EED2-CC)
Bosch Global Software Technologies Private Limited
(CIN: U72400KA1997PTC023164) | Hosur Road, Adugodi | Building number 601 and 602 | Bengaluru - 560 030 | Karnataka | INDIA | www.bosch-softwaretechnologies.com
Mobile +91 7892789865 | Akshay.Shivakumar2@in.bosch.com

  • Hi Akshay,

    The existing output connections are polygons, and the copper thickness is 2oz. From a PCB level it should be able fine.

    Probably the only issues is the current sense resistor footprint is 0508 1W, for these higher currents there should be a higher wattage footprint.

    Maybe it's OK for short duration testing.

    However for 20A you will likely run into FET thermal and inductor thermal issues. The FETs will also have power dissipation limitation, and could damage from too much power dissipation.

    An alternate solution is dual-phase, you can tie two EVMs together in dual-phase for 10A/phase and more manageable thermals.

    See dual-phase description in datasheet.

    Hope this helps,

    -Orlando