LM5072MHX-80

• Fully compliant PD interface to IEEE 802.3af standards
• Versatile auxiliary power option
• 9V minimum auxiliary supply operating voltage range
• 100V maximum input voltage rating
• Programmable DC current limit up to 800mA
• 100V, 0.7Ω hot-swappable MOSFETs
• Integrated PD signature resistor
• Integrated PoE input UVLO
• Programmable inrush current limit
• The classification ability of PD
• Power good indicator
• Thermal shutdown protection

PWM controller

• Current mode PWM controller
• 100V start-up regulator
• The reference voltage of the error amplifier is 2%
• Supports isolated and non-isolated apps
• Programmable oscillator frequency
• Programmable soft-start
• 800 mA peak gate driver
• 80% maximum with built-in slope compensation (-80 devices) duty cycle
• 50% maximum duty cycle with no slope compensation (-50 devices)

illustrate

The LM5072 Power Delivery Equipment (PD) Interface and Pulse Width Modulation (PWM) Controller provide a complete power solution for PD incoming Power over Ethernet (PoE) network power connections fully compliant with IEEE 802.3af standards. The controller integrates all the necessary functions to achieve a PD power interface and a DC-DC converter with a minimum number of external components. The LM5072 provides the flexibility to PD and also accepts power from multiple configurations such as AC adapter secondary sources. Low RDS(ON)PD interface, hot-swappable MOSFETs and programmable DC current limit extend to twice the power level range of 802.3af-compliant PD devices for LM5072 applications. Simplified transient voltage suppressor at a maximum rated voltage of 100V protects PD selection from network transients. The LM5072 includes an easy-to-use PWM controller that facilitates a variety of single-ended power supply topologies, including reverse, forward, and buck. This PWM control scheme is based on peak current mode control, which provides inherent advantages including line feed-forward, cycle-by-cycle current limiting, and simplified feedback loop compensation. Both versions offer LM5072 or 80% maximum duty cycle (-80 suffix), or 50% maximum duty cycle (-50 suffix).

apply

• PoE powered devices that comply with the IEEE 802.3af standard
• Non-compliance, special equipment
• High power Power over Ethernet devices