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TPS54383EVM: Question about the Input voltage range and max current output of TPS54383EVM

Part Number: TPS54383EVM
Other Parts Discussed in Thread: TPS54383, , TPS54386EVM

Hi, 

The datasheet of TPS5438x stated that the input range is 4.5V to 28V and the maximum output current is 3A. However, the spec of the EVM stated that the input range is 9.6V to 13.2V and the maximum output current is 2A.

My design requirement is 24V input, 3.3V and 5V output with 3A each.

Can you let me know if this IC is suitable for my design requirement? If yes, what would I have to change in the EVM circuit in order to meet my design requirements?

Thanks,

Jeff

  • Jeff,

    Yes the EVM was designed a specific use case with 12 V input.  Strictly speaking, you would not have to change anything, however the input capacitors are only rated for 25 V.  The bulk input capacitor C1 would not be very tolerant of any over voltage condition.  I would recommend changing it out for a 35 V rated part.  The input bypass capacitors c10 and C11 are MLCC types.  They would be operating at 96% of rated voltage and the effective capacitance due to DC bias will be very low.  I would replace C10 and C11 with 50 V rated 10 uF capacitors.

    The input voltage change affects the inductor peak to peak ripple current:

    12 V to 3.3 V = 0.362 A

    24 V to 3.3 V = 0.431 A

    12 V to 5 V = .440 A

    24 V to 5 V = 0.6 A

    For 3 A output that is not excessive, so the inductors should be ok.

    The TPS54383 is internally compensated.  The EVM has some external compensation added that is specific for the chosen output filter components.  If you change them you will need to re-configure the external compensation.

  • This is great. Thank you so much for the answer.

    Would it be possible to provide the design files for both TPS54383EVM and TPS54386EVM? 

     

    Thanks,

    Jeff

  • Jeff,

    These are older PCAD files.  We are supposed to edit TI information from them.  I can import them into Altium and do that.  Can you use Altium format?

  • Yes. Altium would be perfect. Thank you so much!

  • As i said, I have to do some editing.  It is after business hours for me.  I should be able to get them tomorrow.  Please contact me directly at j(dash)tucker(at)ti(dot)com.