MIC38300HYHL(2007) 查看數據表（PDF） - Micrel
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MIC38300HYHL Datasheet PDF : 10 Pages
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Micrel, Inc.
case, inductor selection becomes increasingly critical in
efficiency calculations. As the inductors are reduced in
size, the DC resistance (DCR) can become quite
significant. The DCR losses can be calculated as
follows:
L_PD = IOUT2 × DCR
From that, the loss in efficiency due to inductor
resistance can be calculated as follows;
MIC38300
Efficiency
_
Loss
=
⎡
⎢1 −
⎢⎣
⎜⎜⎝⎛
VOUT ×
VOUT × IOUT
IOUT
+L_
PD
⎟⎟⎠⎞⎥⎥⎦⎤
× 100
Efficiency loss due to DCR is minimal at light loads and
gains significance as the load is increased. Inductor
selection becomes a trade-off between efficiency and
size in this case.
July 2007
8
M9999-070607
(408) 944-0800
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