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Switchmode design

H

Henrik [7182]

Jan 1, 1970
0
Hello experts,

I am learning switchmode design and I have been wondering:

Are there any disadvantages from using a bigger coil than the minimum? The
formulaes most often say "larger than or equal to", so the cost and space
issues aside, what would be the downside from using large uH values, where
low uH values would normally suffice?

Thank you for your answer`s.

Best regards
Henrik
 
T

tomrei

Jan 1, 1970
0
Hello experts,

I am learning switchmode design and I have been wondering:

Are there any disadvantages from using a bigger coil than the minimum? The
formulaes most often say "larger than or equal to", so the cost and space
issues aside, what would be the downside from using large uH values, where
low uH values would normally suffice?

Thank you for your answer`s.

Best regards
Henrik

Hi Henrick,

it's mainly about the cost and size, larger inductor value will result
less output ripple and reduce the core loss.
Too large an inductor value results in added expense and may impede
load transient responses because it reduces the effect of slope
compensation.(current mode regulators).

yours Ren
 
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