Press Release

10/29/2004

DOSA ESTABLISHES STANDARD FOOTPRINT FOR HIGH CURRENT QUARTER BRICK DC-DC CONVERTER

DALLAS –Oct. 29, 2004 – The Distributed-power Open Standards Alliance (DOSA) has announced a standard footprint and pin out design for high current quarter-brick DC-DC converters. This new standard establishes both the location and function of additional output pins required for a new generation of high current quarter-bricks. The technically optimized solution was achieved through close collaboration with DOSA members and key OEM customers. In addition to DOSA founding members, Tyco Electronics Power Systems, Inc. and SynQor, Inc., new members Celestica, Lambda and Delta also participated in the standards development process.

The new DOSA standard establishes a common pin placement and designation for the two additional power output pins required for recently introduced high current quarter-bricks, rated in the 50-80A range. Extra power pins are needed due to the increased complexity of the soldering and thermal relief requirements associated with mutilayer boards. The added pins reduce the total resistance, contributing to improved thermal performance and better reliability.

After studying the technical merits of several proposed solutions, DOSA based its standard footprint on the design of SynQor’s high current pin out proposal. In this design, the two additional power pins are located 0.15” (3.81mm) outside of and in line with the existing quarter-brick power pin locations. More importantly, the extra output pins employ the opposite polarity of their adjacent power pin (see diagram). As a result, the DOSA solution maximizes the distance between like polarity pins, allowing significantly less spreading of resistance.

The DOSA standard offers a number of benefits over competing designs. With the specific location and function of the added pins, the overall loop inductance (from converter to board to converter) is reduced by a factor of 10. This improvement allows the module to exhibit better transient response performance, lower output ripple and improved load current balance between the pins. The additional pins reduce total power dissipation in the load board, which contributes to improved thermal performance, enhanced reliability and lower cost of ownership. In addition, since the two extra output pins are not positioned behind existing pins, the tasks of visual inspection and rework are greatly simplified. All other pins retain the same placement and function as the existing quarter-brick standard, which facilitates board layout to allow the use of both types of modules.

“We are excited that DOSA has released another standard in the short time since the alliance was formed, said Sabi Varma, vice president, Marketing and Business Operations at Tyco Electronics Power Systems. “We are continuing with important standards development to improve second sourcing opportunities that are often hindered by inconsistencies in footprints, pin-outs and performance parameters.”

“This past year, SynQor developed a high current quarter-brick footprint which was driven to solve specific customer issues,” said Joseph Coupal, SynQor executive vice president, Marketing and Sales. “We are very pleased that DOSA has endorsed the SynQor design and have applied it toward their high current footprint standard.”

New product announcements will follow this standards announcement. SynQor has announced its PowerQor Peta quarter-brick DC-DC Converters, which employ the DOSA footprint for output voltages delivering up to 60A of current. Other DOSA members will make future product announcements on high current quarter-bricks.

 

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