LM5071 Texas instruments

LM5071

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LM5071

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Описание

The LM5071 power interface port and pulse width modulation (PWM) controller provides a complete integrated solution for Powered Devices (PD) that connect into Power over Ethernet (PoE) systems. The LM5071 is specifically designed for the PD that must accept power from auxiliary sources such as AC adapters. The auxiliary power interface of the LM5071 activates the PWM controller when the ac adapter is connected to power the PD when PoE network power is unavailable. The LM5071 integrates an 80V, 400mA line connection switch and associated control for a fully IEEE 802.3af compliant interface with a full featured current mode pulse width modulator dc-dc converter. All power sequencing requirements between the controller interface and switch mode power supply (SMPS) are integrated into the IC.

Compatible with 12V AC Adapters
Fully Compliant 802.3af Power Interface Port
80V, 1Ω, 400 mA Internal MOSFET
Detection Resistor Disconnect Function
Programmable Classification Current
Programmable Under-voltage Lockout with Programmable Hysteresis
Thermal Shutdown Protection
Auxiliary Power Enable Pin
Current Mode Pulse Width Modulator
Supports both Isolated and Non-Isolated Applications
Error Amplifier and Reference for Non-Isolated Applications
Programmable Oscillator Frequency
Programmable Soft-Start
80% Maximum Duty Cycle Limiter, Slope Compensation (-80 device)
50% Maximum Duty Cycle Limiter, No Slope Compensation (-50 device)

Package

TSSOP-16

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Vin (min) (V)	1.8
Vin (max) (V)	60
PoE current limit (min) (mA)	390
PoE inrush limit (mA) (typ)	100
rDS(on) per FET (typ) (mΩ)	1000
PoE standards supported	802.3at Type 1 (802.3af)
PD power level	13W
DC/DC control	PD and DC/DC
Fault response	Thermal Cycling
Features	Error Amplifier, Primary Side Adapter Priority, Programmable UVLO, Thermal shutdown
Operating temperature range (°C)	-40 to 125
Rating	Catalog