Power Electronics

High-Reliability, 270V DC-DC Converters Handle 120W

SynQor has expanded its MilQor® product line of 270V input dc/dc converters and complementary EMI filters which have been designed specifically for high-reliability applications. The MQFL-270 series of dc/dc converters utilizes SynQor's field-proven, high-efficiency synchronous rectification technology to achieve breakthrough efficiency levels in excess of 88%. 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.

High-Rel MQFL-270 dc/dc converters operate at full power from -55°C to +125°C and accept continuous input voltages of 155-400V while permitting higher transient input voltages of 475V for 1 second. Single output modules are offered in eleven 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% 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 over-voltage shutdown. The Hi-Rel 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).

Sample quantities are readily available, and production quantities are available with a standard lead-time of 12-16 weeks ARO, depending on screening options.

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