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TPS62172: The IC works at the critical point of the CCM and DCM modes, will there be any problems?

Kevin-Cheng
Expert 3135 points
Part Number: TPS62172

Hi team,

the IC work condition: Vin=7V   Vout=3.3V      Fsw=2.25MHz      L=2.2uH

customer's work current is 179mA, it is very close to 176mA, they tested the waveform of IL is like below picture. it seems the IC  switches between CCM and DCM mode. Will there be any problems for the IC? Is it necessary for the customer to modify the parameters to avoid this phenomenon?

  • 0
    TI__Guru**** 150820 points
    Hi Kevin,

    This is ok. As this app note explains, there is a single control mode for both CCM and DCM: www.ti.com/.../slyt531.pdf

    They can also change the inductance to move this point a little bit, if they want. It is also possible that the load current is not DC and that it is changing around the boundary.

    Finally, we have the newer TPS62147/8, which offer higher efficiency, better Vout accuracy, and a forced PWM mode.