The HQA series of
isolated DC/DC converters, rated at 85 W, are qualified with methods consistent
with MIL-STD-883 and MIL-STD-202, making it suitable for use in COTS and harsh-environment
industrial equipment. Initially available with 12-, 24-, and 28-V outputs, the
encapsulated quarter bricks accept a wide-range DC input from 9 to 40 V,
withstanding a 50-V surge for 10 seconds.

TDK-Lambda_HQA_may2017

With typical
efficiencies of up to 90%, internal heating is minimized, allowing the HQA85
converters to operate in high ambient temperatures of up to 115°C
and a minimum of –40°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, 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. Applications include
COTs, vehicle, airborne, communications, and harsh industrial use.