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AN4501 bảng dữ liệu(PDF) 24 Page - STMicroelectronics

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AN4501 bảng dữ liệu(HTML) 24 Page - STMicroelectronics

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Selection of the inductor
AN4501
24/48
DocID026394 Rev 1
4.8
Inductor RMS current
The inductor RMS current (IL,RMS) is needed to calculate the inductor copper loss (power
dissipation caused by resistance of the inductor wires, noted DCR).
The waveform of the inductor current in CCM is a triangular signal with an average current
of IL and a peak-to-peak current IL,PP (see Figure 4).
IL,RMS is given by (see Section 8.7 for the details of the calculations):
Equation 16:
Similarly to IL,PEAK, IL,RMS is also in general reached at DMAX (and VIN,MIN)
The maximum copper loss is PCOPPER,MAX = DCR x I
2
L,RMS,MAX
I
LR MS
,
I
L
2
I
LPP
,
2
12
-----------------
+
=
I
L R MS MAX
,
,
I
LM AX
,
2
I
LPP V
INMIN
()
,
2
12
--------------------------------------
+
I
OU T
2
1D
MAX
–
()
2
---------------------------------
I
LPP V
INMIN
()
,
2
12
--------------------------------------
+
==



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