Product category:
Power Supply ICs and Controllers
News Release from: Arrow Electronics (UK) | Subject: LM5070 evaluation kit
Edited by the Electronicstalk Editorial
Team on 21 February 2005
Chip cuts power over Ethernet down to
size
A new evaluation kit aims to simplify the design and implementation of systems incorporating power over Ethernet functionality.
Now available from Arrow Electronics, National Semiconductor's latest evaluation kit will significantly simplify the design and implementation of systems incorporating power over Ethernet (PoE) functionality Based around National's new LM5070 highly integrated, single-chip PoE power device (PD) IC, the LM5070 evaluation kit is ideal for engineers developing IP phones, remote security cameras, wireless LAN nodes, musical instruments and many other new and emerging applications using PoE
This article was originally published on Electronicstalk on 29 May 2001 at 8.00am (UK)
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The LM5070 evaluation kit provides engineers with all of the hardware needed to fully test the LM5070 and to develop application-specific prototype circuits.
Using the new kit, designers will be able to evaluate all relevant functionality and to configure a number of key functions based on their own application-specific requirements.
Among the features that the user can configure and test include undervoltage lockout (UVLO) trip points and hysteresis, inrush current programming, internal power sequencing, and oscillator frequency.
Whereas competing solutions use two or three chips, the National Semiconductor LM5070 is the first single-chip powered device (PD) interface port and PWM controller to meet the IEEE802.3af POE standard.
As a result, engineers can significantly reduce component count and board space, while improving overall system reliability.
The LM5070 integrates an 80V, 400mA line connection switch and associated IEEE802.3af-compatible PoE interface circuits with a current mode PWM DC/DC controller that steps down the 48V input to power various loads.
All power sequencing requirements between the controller interface and switch mode power supply (SMPS) are integrated into the device.
The LM5070 is available in small footprint LLP-16 or TSSOP-16 packages and features a maximum operating voltage of 75V.
Oscillator frequency is programmable to 1MHz.
The device incorporates a highly accurate fault control loop and a voltage reference, and provides a high-performance error amplifier for nonisolated applications.
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