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Thanks for the reply!
Is this converter(LTC3780 from linear techn) using synchronous rectification?
You neglected to include the effect of the duty-cycle which reduces the efficiency loss from the diode. Since the diode is only conducting during the off time of the PWM signal for a buck converter, the loss in efficiency will be inversely proportional to duty-cycle as largely determined by the input to output voltage ratio....................
Synchronous rectification is usually used in lower voltage applications because the efficiency with a diode that drops even 0.5v is comparable to the output voltage. In higher voltage supplies the diode voltage drop is much less significant because the ratio of the diode drop to the output voltage is very small.
For example, for a 5v output supply the approximate efficiency loss is 0.5/5 which is 0.1 or 10 percent, which is a lot keeping in mind this is just because of the diode alone.
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That is certainly true.Hi,
So then my example would be for a rather large duty cycle. The main point being that the diode drop usually looses much more than the synchro transistor switch.
That is certainly true.