Power over Ethernet (PoE) interface
STMicroelectronics
The PoE/PoE+ interface incorporates all the functions required by the IEEE 802.3at including detection, classification, undervoltage lockout (UVLO) and inrush current limitation.
PM8803 specifically performs IEEE802.3at layer1 hardware classification scheme providing an indication of type 2 PSE successful detection to the rest of the system.
PM8803 has been designed to work with power either from the Ethernet cable or from an external power source such as wall adapter. Two possible connection are available, ensuring in one case prevalence of the auxiliary source wrt the PoE.
The DC/DC section of the PM8803 features a programmable oscillator frequency, an adjustable slope compensation, dual complementary low side drivers, programmable dead time and internal temperature sensor.
PM8803 targets high efficiency conversion at all load conditions supporting flyback, forward, forward active clamp and synchronous rectification.
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