TA0321 Просмотр технического описания (PDF) - STMicroelectronics

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TA0321

Lightning protection for LNB supply and control voltage regulator

STMicroelectronics 

TA0321

5 STMicroelectronics solution

5 STMicroelectronics solution

To offer Satellite Set Top Box manufacturers the best trade-off between cost and lightning

protection of the LNB voltage regulator, STMicroelectronics has introduced the new dedicated

and optimized LNBTVSx-22x devices.

5.1 A segmented & differentiated approach

The product strategy is based on a segmented approach to provide the best suitable protection

device relative to the various LNB voltage regulator absolute maximum ratings capabilities.

It means that depending on the LNB voltage regulator used in the application and depending on

the lightning surge test level applied, a different LNBTVSx-22x has to be implemented to

optimize the cost and robustness of the total solution.

As an example:

When the LNBP21 voltage regulator is used and if the box needs to comply with the level 4 of

the IEC61000-4-5 (4 kV), the best suitable protection device to be implemented is the

LNBTVS4-222S.

See Table 3 for recommended fit.

5.2 Features

● 3 kV, 4 kV and 6 kV protection (8/20 µs)

● Axial & SMD package

● Low Vf

● Low Clamping factor

● Fast Response Time

● UL Recognized

Figure 6. Surge tests +4 kV (Standard IEC61000-4-5 - with series resistor of 12 Ω)

Device only

Device on test board LNBP20

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