The LM5070 power interface port and pulse width modulation(PWM) controller provides a complete integrated solutionfor Powered Devices (PD) that connect into Power overEthernet (PoE) systems. The LM5070 integrates an 80V,400mA line connection switch and associated control for afully IEEE 802.3af compliant interface with a full featuredcurrent mode pulse width modulator dc-dc converter. Allpower sequencing requirements between the controller interfaceand switch mode power supply (SMPS) are integratedinto the IC. Two options are available providing eitheran 80% maximum duty cycle limit with slope compensation(on the –80 suffix) device or a 50% maximum duty cycle limitand no slope compensation on the (–50 suffix) device.
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