Power over Ethernet (PoE) is a widely adopted technology used to transfer both data and electrical power over an RJ-45 cable.
PoE applications should now be compliant with the recently approved IEEE 802.3at specification, commonly known as PoE+. This new standard extends the power available to the powered devices (PD) up to 25.5 W from the 12.95 W available under the former IEEE 802.3af (PoE).
The design of power supply sections of all powered devices can be greatly simplified with the PM880x family,integrating a power over Ethernet (PoE) interface and a current-mode PWM controller. The PoE interface incorporates all the functions required by the communication standard, including detection, classification, undervoltage lockout (UVLO) and in-rush current limitation.
Main benefits
Worldwide standards: Ethernet is widespread and has been adopted all over the world
Lower installation cost: no external wall adapter required
Easy deployment: Ethernet appliances no longer need to be close to the power source
Remote management capability: PoE powered devices can be powered up or down remotely
Improved reliability: UPS can be used to ensure service during black-out
