The PM8800A integrates a standard power over Ethernet (PoE) interface and a current mode PWM controller to simplify the design of the power supply sections of all powered devices.
●The PoE interface incorporates all the functions required by the IEEE 802.3af including detection, classification, under-voltage lockout (UVLO) and in-rush current limitation.
●PM8800A specifically targets PD with extended power requirement with respect to the limit imposed by the 802.3af standard, embedding a hot-swap MOSFET capable of sustaining twice the current of the 802.3af standard with a programmable DC current limit.
●The integrated switching regulator has been designed to work with power either form the Ethernet cable connection or from an external power source such as AC adapter.
●The DC-DC section of the PM8800A features a programmable oscillator frequency, soft-start, slope compensation and embeds a voltage output error amplifier allowing use in both isolated and non isolated configuration.
●Key Features
● Current mode pulse width modulator
● Thermal shutdown protection
● Programmable soft-start
● Programmable oscillator frequency
● 80% maximum duty cycle with internal slope compensation
● Power good indication
● Supports both isolated and non-isolated applications.
● Programmable DCcurrent limit up to 800 mA
● Programmable classification current
● IEEE 802.3af compliant PD interface
● Integrated 100V, 0. 5Ω, 800mA Hot-Swap MOSFET
● Works with power supplied from Ethernet LAN cables or from local auxiliary sources
● Programmable in-rush current limit
● High voltage start-up bias regulator
● Integrated signature resistor
