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LM5164: Efficiency vs. Inductor

Mat1980
Intellectual 1270 points

Part Number: LM5164

Hello Team,


could you help me to understand, why the efficiency does increase in the quick start calculator with smaller inductors in the region of 1 to 100mA?

At what load is the device operating in pulse skipping mode?


Thanks

Mat

  • 0
    TI__Expert 6245 points
    Hello Mat,

    The LM5164 is a COT converter. The on-time is set by the value of RON’s resistor. As long as the part is running in discontinuous mode, since a smaller inductor will allow a greater charge through during each on pulse, the converter’s frequency is lower. Lower frequency overwhelms the effect of higher peak current giving a higher efficiency.

    Regards, Robert