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AN2713 데이터시트(PDF) 16 Page - STMicroelectronics

부품명 AN2713
상세설명  LNB power supply based on the LNBH23 supply
PDF  40 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2713 데이터시트(HTML) 16 Page - STMicroelectronics

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Component selection guidelines
AN2713
16/40
Doc ID 14431 Rev 1
3.9
TVS diode
The LNBH23 device is directly connected to the antenna cable in a set-top box. Atmospheric
phenomenon can cause high voltage discharges on the antenna cable causing damage to
the attached devices. Surge pulses occur due to direct or indirect lightning strikes to an
external (outdoor) circuit. This leads to currents or electromagnetic fields causing high
voltage or current transients. LNBH23 devices are not able to withstand such high energy
discharges, so transient voltage suppressor (TVS) devices are used to protect the LNBH23
and other devices electrically connected to the antenna cable.
The LNBTVS developed by STMicroelectronics is a dedicated lightning and electrical
overstress surge protection device for LNB voltage regulators. These protection devices are
designed to comply with the stringent IEC 61000-4-5 standards and to withstand surges of
up to 500 A. ST offers a broad selection of these products for cost/performance
optimization.
The selection of the TVS diode must be made based on the maximum peak power
dissipation that the diode is capable of supporting.
Select the TVS diode which is capable of supporting the required Ppp(W) value indicated in
Table 6.
Table 5.
Recommended inductors for output R-L filter
Vendor
Part number
Isat(A)
DRC(m
Ω)
Mounting type
Sumida
CD104-221MC
RHC110-221M
1.6
2.4
67
88
SMD
Through-hole
Toko
822LY-221K
824LY-221K
A671HN-221L
A814LY-221M
1.3
1.72
2.44
2.0
70
76
21
75
Through-hole
Through-hole
Through-hole
SMD
Panasonic
ELC08D221E
ELC10D221E
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
Table 6.
Recommended LNBTVS
Vendor
Part number
VBRTYP(V)
Ppp(W)10/100µs
STMicroelectronics
LNBTVS4-220
23.1
1800
LNBTVS4-221
23.1
2000
LNBTVS4-222S
23.1
2000
LNBTVS6-221S
21.3
3000



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