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Aerospace

COTS DC-DC Converter Series Adds 85 W Models

28 February 2017

HQA series DC-DC converters. Source: TDK-Lambda. HQA series DC-DC converters. Source: TDK-Lambda. TDK Corporation has added 85 W models to the TDK-Lambda HQA series of isolated DC-DC converters. The HQA85 has been qualified with methods consistent with MIL-STD-883 and MIL-STD-202, suiting them for use in COTS and harsh environment industrial equipment. Initially available with 12 V, 24 V and 28 V outputs, the encapsulated quarter bricks accept a wide range DC input of 9 V to 40 V, withstanding a 50 V surge for 10 seconds.

With typical efficiencies of up to 90 percent, internal heating is minimized allowing the HQA85 converters to operate in high ambient temperatures of up to 115o C and a minimum of –40o C. No optocouplers are used in the design for enhanced reliability at high temperatures, and the switching frequency is fixed at 270 kHz for simplified noise filtering.

The converter pinout follows the industry standard five pin quarter brick footprint featuring negative logic remote on/off and +/- remote sense. Two package styles are offered; a flanged type measuring 2.39 x 2.2 x 0.5 in. and a non-flanged version measuring 2.39 x 1.54 x 0.5 in.

Input-to-output and input to baseplate isolation is 2,250 Vdc (basic insulation), and the converters are safety certified to UL/CSA/EN 60950-1, with the CE marking in accordance with the LV Directive and RoHS Directives.



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