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NATIONAL SEMICONDUCTOR INTRODUCES 100 V PWM CONTROLLER.



National Semiconductor Corporation (NYSE NYSE

See: New York Stock Exchange
:NSM (Network and System Management) Running and controlling the networks and computer systems in an enterprise. See network management. ) has introduced an integrated 100 V pulse-width modulation Pulse-width modulation (PWM) of a signal or powersource involves the modulation of its duty cycle, to either convey information over a communications channel or control the amount of power sent to a load.  (PWM (Pulse Width Modulation) A modulation technique that generates variable-width pulses to represent the amplitude of an analog input signal. Like its fixed-width pulse density modulation (PDM) cousin, the output switching transistor is on more of the time for a ) 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 oscillator

Mechanical or electronic device that produces a back-and-forth periodic motion. A pendulum is a simple mechanical oscillator that swings with a constant amplitude, requiring the addition of energy at each swing only to compensate for the energy lost because of air
 operating at 1 MHz (MegaHertZ) One million cycles per second. It is used to measure the transmission speed of electronic devices, including channels, buses and the computer's internal clock. A one-megahertz clock (1 MHz) means some number of bits (16, 32, 64, etc. , 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 A Power MOSFET is a specific type of Metal Oxide Semiconductor Field-Effect Transistor (MOSFET) designed to handle large powers. Compared to the other power semiconductor devices (IGBT, Thyristor... , 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 Analog Devices (NYSE: ADI) is an American multinational producer of semiconductor devices. Analog specializes in ADC, DAC, MEMS, and DSP chips for consumer and industrial goods. Analog is presently designing circuits in the 65 nanometer to 3 µm process feature sizes range.  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 Santa Clara, California (IPA: /ˌsæntəˈklærə/) , founded in 1777 and incorporated in 1852, is a city in Santa Clara County, in the U.S. state of 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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