Product category:
Power Supply ICs and Controllers
News Release from: National Semiconductor | Subject: LM5025
Edited by the Electronicstalk Editorial
Team on 07 January 2004
Active clamping boosts power controller
efficiency
The LM5025 is an integrated 100V pulsewidth modulation controller for forward convertors with the active clamp/reset technique used in distributed power architectures.
The LM5025 is an integrated 100V pulsewidth modulation (PWM) controller for forward convertors 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
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
Related stories
Dual-port Gigabit Ethernet transceiver
National Semiconductor has announced the DP83862, a low-cost, highly integrated dual-port 10/100/1000 physical layer transceiver.
World's smallest multifunction supervisory ICs
National Semiconductor has announced a family of supervisory ICs with a variety of factory-programmable features that can be configured in hundreds of possible combinations.
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% and higher primary to secondary turns ratios in the power transformer.
Deploying National Semiconductor's newest high-voltage (100V) precision analogue bipolar-CMOS-DMOS process allows the LM5025 to operate a wide input voltage range (13-100V), benefiting customers by eliminating bias regulator components and reducing the printed board area.
National Semiconductor's LM5025 PWM controller integrates a 100V startup bias regulator and a user programmable oscillator operating at 1MHz, and exhibits total propagation delays of less than 100ns, uniquely qualifying the device for a vast array of 48V 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 3A 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 with 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".
Shipping now, the LM5025 is offered in a tiny LLP-16 or a TSSOP-16 package.
It is priced at US $1.30 each in 1000-unit quantities.
• National Semiconductor: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
