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100V fully integrated Buck bias regulator

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article image Ideal for use in 48V power converters.

NATIONAL Semiconductor, represented by Arrow Electronics, has announced the industry's first 100V Buck bias regulator, which operates at up to 90 percent power efficiency and delivers significant power savings for customers' designs.

The LM5008 has an integrated 100V, 500mA N-channel power MOSFET and all the functions needed to implement a compact, highly efficient bias power supply.

It is the latest addition to National's LM5000 family of high-voltage power solutions and is the company's second generation high-voltage Buck bias regulator.

The LM5008 leverages National's latest advanced 100 V analogue-BiCMOS-DMOS IC (ABCDXV-2) process technology to extend the voltage range of the popular LM5007 80V Buck bias regulator, which was introduced last year.

It is ideal for use in 48V power converters, and in telecommunication, automotiveand battery-powered applications.

The LM5008 is used to step down a primary-side distributed voltage bus (up to 100V input) and produces a low-voltage (12V typical) bias supply for primary-side control and drive devices.

Using the LM5008, a power supply designer can replace a complex, inefficient flyback converter with a simple, efficient Buck regulator. Additionally, as the Buck regulator switches at a higher frequency, filter components are smaller, liberating much-needed board space.

Integration features include:

* Integrated 500mApk, 100V VDMOS transistor, ideal for today's high-density and high-efficiency power converters.

* Intelligent current limit timers ensure short circuit protection while providing minimum foldback

* Protective features include integrated over-temperature shutdown and thermal shutdown circuits.

National's LM5008 is offered in a MSOP-8 package or in a tiny, 4mm by 4mm 8-pin LLP package.

The LM5008 is available for electrical simulation and design optimisation on National's WEBENCH online design tool at http://www.national.com/cgi-bin/WebenchTemplate?base_pn=LM5008.

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