DSL Driver Protection

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Broadband Driver Amp Protection



Design Notes:

Protection Application:
Broadband Line Driver Amplifiers are typically powered by +/- 12V and can produce signals of up to 24V. Due to the high data rates (up to 100Mbps), the capacitance and linearity of the protection scheme are key parameters.
Solution Description:
The solution shown to the left is appropriate for ADSL2+ and some VDSL applications. For VDSL2 and higher, a second set of diodes should be used. The diodes are MURS163T’s from ON Semiconductor. This solution is preferred over rail clamp solutions because the surge energy is not coupled back into the power supply.
Companion Solutions:
Some drivers are powered from a single 5V or 6V supply and a step-up transformer is used. In this case the P0080SAMC is the preferred SIDACtor device. For real estate critical applications, both of these parts are offered in tiny 3x3mm QFN surface mount packages (P0300Q12ALRP and P0080Q12ALRP).
Regulatory Issues:
N/A.
Unique Features:
Littelfuse’s 3x3mm QFN package is the smallest in the industry.
Application Warnings:
N/A.

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