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TIDA-01093: power supply

Simon Jagla
Expert 7375 points
Part Number: TIDA-01093
Other Parts Discussed in Thread: LM25018,

Hi Champs,

could you explain how the power supply works on this design? I see the LM25018 being placed between between BAT+ and GND_B but how do we ensure that the voltage is limited to <48V.

Furthermore I would be interested what are the implications if we stack up the cells to ~400V.

  • 0
    TI__Guru 54715 points

    Hi Simon,

    See the TIDA-01093 design guide https://www.ti.com/lit/ug/tiduc43a/tiduc43a.pdf section 2.5 and figure 10.  Q21 drops most of the battery voltage providing probably 12 to 18V to the switch for the LM25018.  This takes the power from the top of the stack while limiting the voltage to the regulator.

    This mechanism works when the voltage fits the available FETs.  At higher voltages you may want a different technique.

    At higher voltage you will likely need to use isolators rather than the simple current controlled switching to move signals between the different ICs.  You will likely need a different main power switching system also.