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DC/DC converters achieve over 88% efficiency

Posted: 31 Jul 2009 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? EMI filter? power?

MQFL-270 DC/DC converter

SynQor has launched the MQFL-270 series, expanding the company's MilQor product line of 270V input DC/DC converters and complementary EMI filters specified for high-reliability applications.

Featuring SynQor's synchronous rectification technology, they achieve efficiency levels above 88 percent. This reduces dissipated heat by half, compared to other 120W converters in the industry standard full-size package. The converters are fully encased using SynQor's QorSeal technology, to withstand and survive the harsh environments and long-term storage requirements of avionics, missile and other flight applications.

The DC/DC converter series operates at full power from -55C to +125C and accepts continuous input voltages of 155- to 400V while permitting higher transient input voltages of 475V for 1 second. Single output modules are offered in eleven versions: 1.5-, 1.8-, 2.5-, 3.3-, 5-, 6-, 7.5-, 9-, 12-, 15- and 28V. Single output power and current levels are as high as 120W and 40A, respectively. Using the active current sharing function, an unlimited number of single output converters can be paralleled to achieve kilowatts of power. Dual output converters are also available with output voltages of 5V, 12V and 15V with the capability of providing up to 80 percent power from either output.

The feature-rich series includes fixed-frequency switching, no opto-isolators, remote sense, clock synchronization, primary- and secondary-side enable, continuous short-circuit protection, input under-voltage lockout and input overvoltage shutdown. The MQME-270 EMI filter modules rated at 320W (2A) provide >80dB of differential attenuation (and >60dB of common-mode attenuation) at 500kHz. Used together, MilQor DC/DC converters and EMI filters permit compliance with MIL-STD-704(A-F), RTCA/DO-160-E (Section 16), MIL-STD-1275B, and DEF-STAN 61-5(6/5), as well as MIL-STD-461(C-E) and RTCA/DO-160E (Section 22; Lightning).

SynQor's QorSeal packaging approach provides a conduction-cooled mechanical assembly around an SMT-constructed power circuit that is low-profile, light-weight, and shielded. Its non-hybrid construction has been designed per NAVSO-P3641-A guidelines, with all components derated per MIL-HDBK-1547A. They are qualified to MIL-STD-810F, as well as to SynQor's internal First-Article (consistent with MIL-STD-883F), Storage-Survivability, and On-Going Life-Test procedures. As a result, the MilQor product line will survive the most severe long-term storage and operational environments encountered in military, avionic, and high-reliability applications.

Compared with hybrid chip-and-wire converters, manufactured in the USA in an AS9100B certified facility, the MQFL-270 portfolio is competitively priced. Sample quantities are readily available, and production quantities are available with a standard lead-time of 12 to 16 weeks ARO, depending on screening options.

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