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LM5070SDX-80 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM5070SDX-80 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 17 page LM5070 Integrated Power Over Ethernet PD Interface and PWM Controller General Description The LM5070 power interface port and pulse width modula- tion (PWM) controller provides a complete integrated solu- tion for Powered Devices (PD) that connect into Power over Ethernet (PoE) systems. The LM5070 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 in- terface and switch mode power supply (SMPS) are inte- grated into the IC. Two options are available providing either an 80% maximum duty cycle limit with slope compensation (on the –80 suffix) device or a 50% maximum duty cycle limit and no slope compensation on the (–50 suffix) device. Features n Fully Compliant 802.3af Power Interface Port n 80V, 1 Ω, 400 mA Internal MOSFET n Programmable Inrush Current Limit n Detection Resistor Disconnect Function n Programmable Classification Current n Programmable Under-voltage Lockout with Programmable Hysteresis n Thermal Shutdown Protection n Current Mode Pulse Width Modulator n Supports both Isolated and Non-Isolated Applications n Error Amplifier and Reference for Non-Isolated Applications n Programmable Oscillator Frequency n Programmable Soft-start n 80% Maximum Duty Cycle Limiter, Slope Compensation (-80 device) n 50% Maximum Duty Cycle Limiter, No Slope Compensation (-50 device) n 800 mA Peak Gate Driver Packages n TSSOP-16 n LLP-16 (5 mmx5mm) 20120001 December 2004 © 2004 National Semiconductor Corporation DS201200 www.national.com |
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