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TPSM84624: Effective output capacitance

Kaveh Hosseini Aghdam
Prodigy 10 points
Part Number: TPSM84624


Hi there,

About the total effective output capacitance (stated on page 15 of the datasheet to calculated RTT value), should we take into account only the output capacitors placed just close to the TPSM84624 output pins or also the decoupling capacitors placed close to the load if there is a very low impedance path between the TPSM84624 and the oad?

I look forward to hearing from you.

Thanks & BR,

Ghasem

  • 0
    TI__Mastermind 35185 points

    Hi Ghasem,

    Yes, the RTT calculation should use the output capacitors placed close to the load if the connection between them and the regulator is very low impedance.

    In general, not including the capacitors at the load should still give a stable design as it just results in less gain and a lower crossover frequency but the loop will not be well optimized. Both the gain and the zero from the compensation will change with the RTT resistor. As a result of the compensation zero not being optimally placed, the phase margin could be lower than desired.

  • 0 in reply to Anthony F
    Prodigy 10 points

    Hi Anthony,

    Thank you so much for the comprehensive response.

    Best Regards,

    Ghasem