LM5071MT-50

• Compatible with 12V AC adapters
• Fully 802.3af compliant power interface port
• 80V，1 , 400 mA internal MOSFET
• Sense resistor disconnect function
• Programmable classification current
• Programmable undervoltage lockout with programmable hysteresis
• Thermal shutdown protection
• Auxiliary power pin
• Current mode pulse width modulator
• Supports isolated and non-isolated apps
• Error amplifiers and reference nonisolated applications
• Programmable oscillator frequency
• Programmable soft-start
• 80% maximum duty cycle limit, slope compensation (-80 devices)
• 50% maximum duty cycle limit with no slope compensation (-50 devices)

illustrate

The LM5071 power interface port and pulse width modulation (PWM) controller provide a complete integrated solution for connecting power supply devices powered by Power over Ethernet (PoE) systems（PD）。 LM5071 is designed for PD and must be accepted fromBackup power supply designSuch as AC adapters。 The auxiliary power interface of the LM5071 activates the PWM controller when the power of the PD power network connected to the AC adapter is not available. The LM5071 integrates an 80V, 400mA wire connection switch with a fully IEEE 802.3af-compliant interface and a full-featured current-mode pulse-width modulator DC-DC converter-related control. The interface between all power sequencing controllers and the requirement for switch-mode power supplies (SMPS) are integrated into the IC.