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TPS2373-4EVM-758: how to power up the EVM properly?

Prasanna TA
Prodigy 10 points
Part Number: TPS2373-4EVM-758


We have this EVM unit, TPS2373-4EVM-758,  on hand. 

We connected the EVM input to a DC Power Supply.  EVM Output is not connected to any load.   As soon we apply input from 0V and gradually increase towards 1V, the input current drawn shoots up suddenly,  towards 2A.  We switched off the input instantaneously at this point of time, foreseeing any damage to the EVM.  We repeated this and got the same result, means no additional damage occurred to the EVM due to our powering up exercise.     We did not try with POE PSE, in order to avoid possible damage to the EVM.

 How to proceed?

  • 0
    TI__Mastermind 41800 points

    Hi Prasanna,

    When you say EVM input, do you mean the adapter input of the EVM (J3)? Or do you mean the a bench power supply into the RJ45 PoE input? If the latter, can you let me know what your setup was? If the first, it seems the DCDC might be damaged and would be good to check if the PoE front end is damaged as well. You can do this by trying to power with a detection voltage (10V) on TP1 and TP2 with a bench power supply and measure the detection current with a series current meter (should read ~400uA).

    This will tell us which side of the board is damaged (if it is).

    Note also if you plug in a PSE, and there is already a fault on the PD side, the PSE should not turn ON to power the PD (rather it will wait for a valid PD to be connected). If the fault is on the DCDC side, the PSE and PD should still protect itself. These are two among many benefits of PoE.

    Regards,

    Darwin