AN2713 datasheet(16/40 Pages) STMICROELECTRONICS

16 / 40 page

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

SMD

Through-hole

Toko

822LY-221K

824LY-221K

A671HN-221L

A814LY-221M

1.3

1.72

2.44

2.0

Through-hole

SMD

Panasonic

ELC08D221E

ELC10D221E

1.8

3.2

Through-hole

Coilcraft

DC1012-223

PVC-0-223-03

DO3316P-223

2.5

2.6

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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