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PM6675ASTR bảng dữ liệu(PDF) 36 Page - STMicroelectronics

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PM6675ASTR bảng dữ liệu(HTML) 36 Page - STMicroelectronics

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Application information
PM6675AS
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With these considerations, the inductance value can be calculated with the following
expression:
Equation 30
where fSW is the switching frequency, VIN is the input voltage, VOUT is the output voltage and
is the inductor current ripple.
Once the inductor value is determined, the inductor current ripple is then recalculated:
Equation 31
The next step is the calculation of the maximum r.m.s. inductor current:
Equation 32
The inductor must have an r.m.s. current greater than IL,RMS in order to assure thermal
stability.
Then the calculation of the maximum inductor peak current follows:
Equation 33
ILPEAK is important in inductor selection in term of its saturation current.
The saturation current of the inductor should be greater than ILPEAK not only in case of hard
saturation core inductors. Using soft-ferrite cores it is possible (but not advisable) to push
the inductor working near its saturation current.
In Table 11 some inductors suitable for typical working conditions are listed.
Table 11.
Evaluated inductors (@ fsw = 400 kHz)
Manufacturer
Series
Inductance
(µH)
+40°C rms
current (A)
-30% saturation
current (A)
COILCRAFT
MLC1538-102
1
13.4
21.0
COILCRAFT
MVR1261C-112
1.1
20
20
WURTH
7443552100
1
16
20
COILTRONICS
HC8-1R2
1.2
16.0
25.4
IN
OUT
L
OUT
IN
V
V
I
fsw
V
V
L
⋅
∆
⋅
−
=
MAX
,
IN
OUT
OUT
MAX
,
IN
MAX
,
L
V
V
L
fsw
V
V
I
⋅
⋅
−
=
∆
12
)
I
(
)
I
(
I
2
MAX
,
L
2
MAX
,
LOAD
RMS
,
L
∆
+
=
2
I
I
I
MAX
,
L
MAX
,
LOAD
PEAK
,
L
∆
+
=



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