AN315
ROBUST ELECTRICAL SURGE IMMUNITY F O R P O E PD S T H R O U G H I N T E G R A T E D P R O T E C T I O N
1.
Introduction
The Si3400 and Si3401 Power over Ethernet (PoE) powered device (PD) controllers are designed in an efficient Silicon on Insulator (SOI) process technology, which enables the integration of a robust surge protection function.
Competitive PoE PD devices require external transient
voltage suppressors (TVS), such as an SMAJ58A, to provide surge protection.
However, due to their inherently wider range of clamping
voltage specifications, external TVS-based protectors typically necessitate the use of 100 V processes for the PD controller device.
This note discusses some of t...