lm5070sd-50 National Semiconductor Corporation, lm5070sd-50 Datasheet
lm5070sd-50
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lm5070sd-50 Summary of contents
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... Fully Compliant 802.3af Power Interface Port n 80V, 1Ω, 400 mA Internal MOSFET n Programmable Inrush Current Limit n Detection Resistor Disconnect Function Block Diagrams © 2006 National Semiconductor Corporation n Programmable Classification Current n Programmable Under-voltage Lockout with Programmable Hysteresis n Thermal Shutdown Protection n Current Mode Pulse Width Modulator ...
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... Block Diagrams (Continued) Connection Diagram Ordering Information Order Number Description LM5070MTC-50 50% Duty Cycle Limit LM5070MTCX-50 50% Duty Cycle Limit LM5070SD-50 50% Duty Cycle Limit LM5070SDX-50 50% Duty Cycle Limit LM5070MTC-80 80% Duty Cycle Limit LM5070MTCX-80 80% Duty Cycle Limit LM5070SD-80 80% Duty Cycle Limit LM5070SDX-80 80% Duty Cycle Limit www ...
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Pin Descriptions Pin Name Description 1 V System high potential input RSIG Signature resistor pin. 3 RCLASS Classification resistor pin. 4 UVLO Line under-voltage lockout. 5 UVLORTN Return for the external UVLO resistors. 6 RCLP Current limit programming ...
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Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. V ,RTN RSIG UVLO UVLORTN RCLASS, RCLP to V ...
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Electrical Characteristics Specifications in standard type face are for T perature range. Unless otherwise specified: V Symbol Parameter V Supply CC V UVLO (Rising UVLO (Falling) CC Supply Current (Icc) Error Amplifier GBW Gain Bandwidth DC Gain Input ...
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Electrical Characteristics Specifications in standard type face are for T perature range. Unless otherwise specified: V Symbol Parameter Thermal Shutdown Tsd Thermal Shutdown Temp. Thermal Shutdown Hysteresis Thermal Resistance θ Junction to Ambient JA Note 1: Absolute Maximum Ratings are ...
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Typical Performance Characteristics Default Current Limit vs Temperature Oscillator Frequency vs RT Resistance Softstart Current vs Temperature Inrush Current Limit vs RCLP Resistor 20120009 UVLO Hysteresis Current vs Temperature 20120013 Error Amp Input Voltage vs temperature 20120015 7 20120010 20120008 ...
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Typical Performance Characteristics Oscillator Frequency vs Temperature RT = 15.2 kΩ Input Current vs Input Voltage www.national.com (Continued) 20120014 UVLO Threshold vs Temperature 20120007 20120012 20120006 ...
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Block Diagrams FIGURE 2. Top Level Block Diagram 9 20120004 www.national.com ...
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Block Diagrams (Continued) Detailed Operating 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. Major features of the ...
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Modes of Operation (Continued) TABLE 1. Operating Modes With Respect to Input Voltage Input Voltage Mode of V wrt V Operation IN EE 1.8V to 10.0V Detection (Signature) 12.5V to 20.5V Classification 23.0V to UVLO Awaiting Full Rising Vth Power ...
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Power Supply Operation / Current Limit Programming Once the UVLO threshold has been satisfied, the interface controller of the LM5070 will charge up the SMPS input capacitor through the internal power MOSFET. This load capacitance provides input filtering for the ...
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Oscillator, Shutdown and Sync Capability (Continued) LM5070-80: LM5070-50: The LM5070 can also be synchronized to an external clock. The external clock must have a higher frequency than the free running oscillator frequency set by the RT resistor. The clock signal ...
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Physical Dimensions www.national.com inches (millimeters) unless otherwise noted Package Number MTC16 Package Number SDA16A 16 ...
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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information ...