Synqor Expands Milqor Converter And Filter Range

Synqor has expanded its Milqor product line of 270V input DC/DC converters and complementary EMI filters, which has been designed specifically for high-reliability applications. The MQFL-270 series of DC/DC converters utilises Synqor's high-efficiency synchronous rectification technology to achieve efficiency levels of more than 88 per cent. This effectively reduces the dissipated heat by half as compared to other 120W converters in the industry-standard full-size (FL) package. Fully encased using Synqor's Qorseal technology, the MQFL-270 series is constructed to withstand and survive the harsh environments and long-term storage requirements of avionics, missile and other flight applications.

Hi-Rel MQFL-270 DC/DC converters operate at full power from -55C to +125C and accept continuous input voltages of 155-400V, while permitting higher transient input voltages of 475V for one second. Single-output modules are offered in 11 versions ranging from 1.5V to 28V, including 1.5V, 1.8V, 2.5V, 3.3V, 5.0V, 6.0V, 7.5V, 9.0V, 12V, 15V 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 per cent power from either output. The series includes fixed-frequency switching, no opto-isolators, remote sense, clock synchronisation, primary- and secondary-side enable, continuous short-circuit protection, input under-voltage lockout and input over-voltage shutdown. The Hi-Rel MQME-270 EMI filter modules rated at 320W (2A) provide more than 80dB of differential attenuation (and more than 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 has a low profile and is lightweight 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 ongoing life test procedures. As a result, the Milqor product line will survive the severe long-term storage and operational environments encountered in military, avionic and high-reliability applications. Sample quantities are available now and production quantities are available with a standard lead time of 12-16 weeks after receipt of order (ARO), depending on screening options.

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