What are the effect of the switching frequency of mosfety on output
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What is the effect of switching frequency on output voltage ripple and inductor current for DC-DC converter (boost and buck)
boost
What is the effect? Is there any article or lecture note for me on this?
and I would like one more question what is the effect of load resistance has on inductor current on DC-DC converter?
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Sep 12 '15 at 14:42
LearningLaSo
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There is a lot of information available on the web for both the Buck Converter and Boost Converter. As well as the links provided take a look at application notes from the many IC manufacturers that provide buck and boost controllers. – Warren Hill Sep 12 '15 at 15:28
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Speaking very generally, for a fixed inductance increasing the switching frequency will decrease the inductor ripple current and usually the output voltage ripple. It will increase switching losses and decrease efficiency.
If you increase switching frequency and decrease inductance it can lead to a smaller overall design though potentially with even higher losses due to inductor core loss. Output ripple may or may not decrease depending on the frequency and characteristics of the output capacitors.
The effect of increasing load resistance is as follows:
At very high resistance the converter MAY be operating in PFM mode or discontinuous current mode. IF that's the case then decreasing the resistance will eventually bring the converter into continuous mode where the inductor current never reaches zero. At that point further decreases in load resistance will increase the average inductor current (which will then equal the output current in a buck and the input current in a boost.)
As the comment says above there's lots of information on the web, and I think it's beyond the scope of this forum to give a full answer on the complexities of both topologies.