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the highest efficiency of synchronization buck converter

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katherine

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When I calculate the efficiency, I find that I can get the highest efficiency under the condition that switching loss is equal to conduction loss. There is a problom that the high efficiency is correlative with load current. How much is the load current when the buck converter's efficiency is highest! Please help me,thanks in advance!
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Ideally the buck converter should get more efficient as the load current increases. The load current is again limited by the ripple.
 

Vamsi Mocherla said:
Ideally the buck converter should get more efficient as the load current increases. The load current is again limited by the ripple.
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I don't understand your meaning.From the curve of load current vs. efficiency, we can see the highest efficiency according to one load current Iload_m.When Iload >I load_m, the efficiency falls.When Iload < Iload_m, the efficiency rises.I know the reason of the phenomena,but how to find the optimum Iload_m.
 

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