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AN3115 bảng dữ liệu(PDF) 14 Page - STMicroelectronics

tên linh kiện AN3115
Giải thích chi tiết về linh kiện  LNB power supply based on the LNBH23L supply and control IC with step-up and I²C interface
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AN3115 bảng dữ liệu(HTML) 14 Page - STMicroelectronics

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Component selection guidelines
AN3115
14/28
Doc ID 16830 Rev 3
2.2
Output current limit selection (R2-RSEL)
The linear regulator current limit threshold can be set through an external resistor connected
to the ISEL pin. The resistor value defines the typical output current threshold limit by the
equation:
Equation 2
Where RSEL is the resistor connected between ISEL and GND. The highest selectable
current limit threshold is 0.650 A typ. with RSEL = 15 kΩ
To set the current limitation, ±15 % tolerance, referred to the typical Imax current value, must
be considered. At this tolerance the tolerance of the RSEL resistor must be added.
For example:
RSEL resistor = 15 kΩ ± 1 %
To calculate the Imax(min) and Imax(max) values:
Where:
–
15 % is the LNBH23L tolerance
–1 % is the RSEL tolerance
Table 6.
Recommended Inductors
Vendor
Part number
ISAT (A)
DRC (m?)
Mounting type
Sumida
CD104-220MC
RHC110-220M
1.6
2.4
67
88
SMD
Through-hole
Toko
822LY-220K
824LY-220K
A671HN-220L
A814LY-220M
1.3
1.72
2.44
2.0
70
76
21
75
Through-hole
Through-hole
Through-hole
SMD
Panasonic
ELC08D220E
ELC10D220E
1.8
3.2
51
40
Through-hole
Through-hole
Coilcraft
DC1012-223
PVC-0-223-03
DO3316P-223
2.5
3
2.6
46
35
85
Through-hole
Through-hole
SMD
Rsel
A
ax
10000
)
(
Im
=
mA
666
15000
10000
)
typ
(
ax
Im
=
=
%
16
%
1
%
15
ce
TotToleran
=
+
=



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