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MC33063A: MC33063A output ecap with lower ESR

Ivan Camargo
Prodigy 10 points
Part Number: MC33063A

For a current design with the DC DC converter MC33063ADR, there is being used an output capacitor of 1000uF with an ESR of 0.16 Ohms, and we are evaluating an alternate with the same specifications but with an ESR of 0.08, are there any issues changing to a lower ESR?, is there a recommended ESR range?,

  • 0
    TI__Guru 65170 points

    Hello Ivan,

    In theory a lower ESR should not have a too negative impact on the converter steady state operation. Nevertheless, I would check either a load transient or a bode diagram to see the transient response of the converter. See some information about a transient check here: https://www.ti.com/lit/an/slva381b/slva381b.pdf 

    In general the inrush current at the start of the converter might increase, dependent on the converter type you haved.

    Best regards,
    Brigitte