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Isolated dc-dc converter reference design

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INTERNATIONAL Rectifier, represented in Australia by Arrow Electronics , has introduced the IRDC2086-330W, a reference design featuring the IR2086S dc Bus Converter control IC and DirectFET power MOSFET chipset.

The reference design simplifies development of 48V input brick or embedded power supplies for networking, communications and high-end server applications.

The IRDC2086-330W is a 48V to 9.6V (35A) unregulated dc bus converter that is 97% efficient, in a size 30% smaller than industry-standard quarter brick regulators.

In addition, the IRDC2086-330W 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 80V DirectFET primary-side MOSFETs and four IRF6635 30V DirectFET secondary-side synchronous MOSFETs.

Small MOSFETs are used for bias switching (one IRF7830 80V MOSFET in an SO-8) and the secondary clamp (two IRF6621 30V Small Can DirectFET MOSFETs).

The IR2086S full-bridge controller operates at high frequency (programmable to 500kHz) 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 (Gerber, .dxf, .cad) and application notes.

IR's online design tool, myPOWER, can be used to customise a MOSFET selection to suit an application.

The myPOWER online design tool is available at no charge, after a simple registration process, at http://mypower.irf.com.

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