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NATIONAL SEMICONDUCTOR INTRODUCES 100 V PWM CONTROLLER.

National Semiconductor Corporation (NYSE:NSM) has introduced an integrated 100 V pulse-width modulation (PWM) controller for forward converters with the active clamp/reset technique used in distributed power architectures. This new device is designed for high switching frequencies and provides higher efficiencies and greater power densities than conventional forward regulators in communications, automotive, distributed and industrial power systems, and multi-output power supplies.

The active clamp technique is one of the most popular single-ended topologies used in distributed power architectures, allowing operation at duty cycles above 50 percent and higher primary to secondary turns ratios in the power transformer. Deploying National Semiconductor's newest high-voltage (100 V) precision analog bipolar-CMOS-DMOS process allows the LM5025 to operate a wide input voltage range (13 V - 100 V), benefiting customers by eliminating bias regulator components and reducing the printed board area.

National Semiconductor's LM5025 PWM controller integrates a 100 V start-up bias regulator and a user programmable oscillator operating at 1 MHz, and exhibits total propagation delays of less than 100nS, uniquely qualifying the device for a vast array of 48 V communication isolated power supply applications. With the active clamp output, the LM5025 can be configured to provide either overlap time (for P-channel switch applications) or dead-off time (for N-channel switch applications). National's unique 3 A peak compound gate driver technology makes the LM5025 ideal for direct drive of a high- power MOSFET, reducing board space and leading to increased power density compared to alternative PWM controllers that require the addition of a gate driver chip.

"National's LM5025 complements our industry-leading LM5000 family of high- voltage power ICs to offer no-compromise solutions to satisfy the escalating needs of our customers," said Paul Greenland, marketing director of National Semiconductor's power management group. "The LM5025's level of integration and functionality is superior to existing products, giving National a competitive edge in the fast growing distributed power supply market."

Availability

Shipping now, the LM5025 is offered in a tiny LLP-16 or a TSSOP-16 package. It is priced at $1.30 each in 1,000 unit quantities.

About National Semiconductor

National Semiconductor, an analog company, creates high performance analog devices and subsystems. National's products include power management circuits, display drivers, audio and operational amplifiers, imaging sensors and data conversion solutions. National's key markets include wireless handsets, displays, PCs, networks and a broad range of portable applications. With headquarters in Santa Clara, California, National reported sales of $1.67 billion for fiscal 2003, which ended May 25, 2003.

National Semiconductor can be found on the World Wide Web at http://www.national.com.

For more information, call 408/721-5222.
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Publication:Electro Manufacturing
Geographic Code:1USA
Date:Feb 1, 2004
Words:430
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