El Segundo, Calif.—International Rectifier's IRDC2086-330W is a DC/DC reference design that delivers 35 amps at an unregulated 9.6 volts with 97 percent efficiency to simplifiy development of brick and embedded power supplies for networking, communications, and high-end server applications (48-volt input). The design, measuring 30 percent smaller than industry standard quarter-bricks, reduces the number of powertrain components from three ICs and 14 FETs, to a single IC and eight FETs.
The reference design comprises the IR2086S primary-side, full-bridge DC bus converter control IC and eight power train MOSFETs. The MOSFETs include four IRF6646 80-volt DirectFET primary-side MOSFETs and four IRF6635 30-V DirectFET secondary-side synchronous MOSFETs, a small MOSFET used for bias switching (80-volt IRF7830 MOSFET in an SO-8) and a secondary-side clamp (two IRF6621 30-volt small can DirectFETs).
The IR2086S, working at high frequency (programmable to 500 kHz) features an integrated soft-start capacitor that gradually increases duty cycle to 50 percent 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 design also touts thermal advantages. "IR’s (design) reduces primary temperature as much as 40 degrees C over standard solutions for increased system reliability," said Stephen Oliver, marketing manager for SMPS Products.
Click here for additional information on the company's portfolio of reference design kits, and here for the IRDC2083-330W product's user guide. The reference design, which includes a CD-ROM containing a user’s guide, data sheets, PCB files (Gerber, .dxf, .cad) and application notes, is priced at $250 each. Prices are subject to change. In addition, users have access to IR’s on-line design tool, MyPOWER, at no charge after simple registration, at mypower.irf.com for customizing the MOSFET selection.
International Rectifier, 1-310-252-7105, www.irf.com