LM5070 Datasheet | National Semiconductor

Description The LM5070 power interface port and pulse width modulation (PWM) controller provides a plete integrated solution for Powered Devices (PD) that connect into Power over Ethernet (Po E) systems. The LM5070 integrates a 76V, 400m A line connection switch and associated control for a fully IEEE 802.3af pliant 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. Two options are available providing either an 80% maximum duty cycle limit with slope pensation (on the - 80 suffix) device or a 50% maximum duty cycle limit and no slope pensation on the (- 50 suffix) device. Features n Fully pliant 802.3af Power Interface Port n 76V, 1Ω, 400 m A 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 pensation (-80 device) n 50% Maximum Duty Cycle Limiter, No Slope pensation (-50 device) n 800 m A Peak Gate Driver Packages n TSSOP-16 n LLP-16 (5 mm x 5 mm) © 2005 National Semiconductor Corporation DS201200 .national. Connection Diagram FIGURE 1. Simplified Block Diagram 16 Lead TSSOP, LLP Ordering Information Order Number LM5070MTC-50 LM5070MTCX-50 LM5070SD-50 LM5070SDX-50 LM5070MTC-80 LM5070MTCX-80 LM5070SD-80 LM5070SDX-80 Description 50% Duty Cycle Limit 50% Duty Cycle Limit 50% Duty Cycle Limit 50% Duty Cycle Limit 80% Duty Cycle Limit 80% Duty Cycle Limit 80% Duty Cycle Limit 80% Duty Cycle Limit NSC Package Type / Drawing TSSOP-16/MTC-16...