LM5071MT-50

• Compatible with 12V AC adapters
• Fully 802.3af compliant power interface port
• 80V，1 , 400 mAh internal MOSFET
• Detect resistor disconnection function
• Programmable classified current
• Programmable undervoltage latching with programmable hysteresis
• Thermal shutdown protection
• Auxiliary power pin
• Current mode pulse width modulator
• Supports both isolated and non-isolated applications
• Error amplifiers and reference non-isolated 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 to Power Supply Devices (PDs) powered by Power over Ethernet (PoE) systems. The LM5071 is designed for PD and must accept backup power designs such as AC adapters. The auxiliary power interface of the LM5071 activates the PWM controller when the power of the PD power supply network of the AC adapter connected to the power supply is not available. The LM5071 integrates an 80V, 400 mA wire-connected 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) is integrated into the IC.