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TPS53819AEVM-123: Maximum input current inconsistency

Frederik Wauters
Prodigy 10 points
Part Number: TPS53819AEVM-123
Other Parts Discussed in Thread: TPS53819A

We want to develop an application, driving 2.2V - 20A with Vin=20 V.

The TPS53819A controller is rated to 28V, the website of the datasheet also lists Vin max = 28V, but the datasheet of the EVM lists 14V.

What is the reason for that, is it safe to run the EVM , or the controller with this power block to 20V Vin?

  • 0
    TI__Expert 5900 points
    Frederik,
    EVMs are typically designed for narrow use case sometimes and it may not reflect the whole range the IC is capable of. In this case the input caps C1-C4 are rated for 16V so i would recommend switching them to 25V or higher caps in case you want to check 20V operation. Also Fig 18 shows the SW pin voltage having an overshoot of 1.5x. At 20V the SW node voltage may become 30V. Since the FET is rated 30V I would recommend using a resistor in series with the boot cap to reduce the overshoot. 3.3ohms(R5) would be a good value to start with. then just check the SW node voltage with the full bandwidth on the scope and make sure it stays below 30V at 20V.

    Regards,
    Mathew