330 W isolated DC-DC converter reference design for 48 V bricks

3 May 2006 Power Electronics / Power Management

International Rectifier's new reference design, featuring the IR2086S DC Bus Converter control IC and DirectFET power Mosfet chipset, the IRDC2086-330W, can simplify the development of 48 V input brick or embedded power supplies for networking, communications and high-end server applications.

The IRDC2086-330W is a 48 V to 9,6 V (35 A) unregulated DC bus converter that is 97% efficient, in a size 30% smaller than industry-standard quarter brick regulators. In addition, it reduces the number of powertrain components from three ICs and 14 FETs to a single IC and eight FETs.

The reference design chipset consists of the IR2086S primary-side, full-bridge control IC plus eight power train Mosfets: four IRF6646 80 V DirectFET primary-side Mosfets and four IRF6635 30 V DirectFET secondary-side synchronous Mosfets. Small Mosfets are used for bias switching (one IRF7830 80 V Mosfet in an SO-8) and the secondary clamp (two IRF6621 30 V Small Can DirectFET Mosfets).

The IR2086S full-bridge controller operates at high frequency (programmable to 500 kHz), and features an integrated soft-start capacitor that gradually increases duty cycle to 50% over 2000 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.

The reference design includes the IRDC2086-330W fully-assembled printed circuit board, and a CD-ROM containing a User's Guide, data sheets, PCB files and application notes. In addition, IR's on-line design tool, myPOWER, can be used to customise Mosfet selection to suit one's application.

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