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LM5070SDX-80 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM5070SDX-80
Descripción Electrónicos  Integrated Power Over Ethernet PD Interface and PWM Controller
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM5070SDX-80 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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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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