Boost converter efficiency, TPS61021A - Electrical Engineering Stack Exchange


i using tps61021 boost converter ic increase input voltage 1.2v 3.3v. have designed boost converter application called ti webench.

input voltage: 1.2v

output voltage: 3.3v

min current: 300ma

the pcb have designed, measuring 3.3v, efficiency pathetic. below 25%. in bom, ti webench software recommends using 10uf 10v capacitor, using 10uf 6.3v. not able understand why efficiency low? datasheet inductor.

below in tabular format have written current values have measured multimeter.

enter image description here

fig.1 measurement of current @ different load resistance.

fig.1 ti webench application output fig.2 ti webench application output

schematic in pcb designer software

fig.3 schematic design of boost converter pcb picture

pin = 1.2v × 570ma = 684 mw

pout = 3.3v × 105 ma = 346.5 mw

efficiency = pout/pin = 346.5/684 = 50.7%

how on earth did come 18.42%?

similarly, 64% , 70% other 2 loads. these numbers sound pretty me @ these voltages. did webench give efficiency estimates specific configuration?


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