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IR unveils chipset for telecom input, 48V fixed input systems

Posted: 11 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:international rectifier? ir? chipset? directfet? mosfet?

International Rectifier (IR) introduced a new chipset solution for wide range, universal telecommunications input (36V to 75V) and 48V fixed input systems.

Designed for isolated or non-isolated dc-dc converter applications, the chipset enhances system level power supply performance such as bulk 48V conversion for system boards up to 220W or for powering the radio amplifier in base station systems, the company said.

"Our new optimized chipset consists of new DirectFET MOSFETs and the new IR2086S controller IC to create simplified complete solutions for two commonly used converter topologies in the networking and communications industry," shared Carl Smith, Marketing Manager for IR's Networking and Telecommunication Products.

According to the press release, the IR2086S controller IC simplifies isolated dc-dc converter circuits using primary side full-bridge topologies. The chip is specifically designed for bus converter applications, using a self-oscillating 50 percent fixed duty cycle. It helps reduce overall board space by up to 50 percent versus industry-standard quarter-bricks and reduces overall component count by up to 60 percent, IR added.

The IR2086S features an integrated soft-start capacitor that gradually increases duty cycle to 50 percent over 2,000 cycles to limit in-rush current during start up and maintains equal pulse widths for the high- and low-side MOSFETs in the full bridge throughout the start-up sequence. Other features include hiccup current limit protection, 1.2A gate drive current, and adjustable deadtime from 50ns to 200ns to protect against shoot-through current and programmable switching frequency up to 500kHz.

To complete the chipset, designers may choose from four new DirectFET MOSFETsthe 100V IRF6644 and IRF6655, or the 40V IRF6613 and IRF6614. The new MOSFETs use the company's latest trench technology with DirectFET packaging technology, enabling reduction in key device specifications such as on-resistance and gate charge.

IR's DirectFET technology
According to IR, its patented DirectFET MOSFET packages present a whole new set of design advantages not previously delivered by standard plastic discrete packages. Their metal can construction enables dual-side cooling that doubles the current handling capacity of high frequency dc-dc buck converters powering advanced microprocessors.

Pricing is $1.10 for the IRF6644, 48 cents for the IRF6655, $1.47 for the IRF6613, 64 cents for the IRF6614, and $2.49 for the IR2086S, all in 10,000-unit quantities.

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