DC-DC converters target harsh environments

DC-DC converters target harsh environments

New Products |
By Peter Clarke

The encapsulated quarter brick HQA120 models can deliver 120W output power from a 9V to 40V input range that can also support a 50V input for 1 second.  The 89% efficient converters are suitable for use in COTS, communications and industrial equipment using 12 V, 24 V and 28 V power rails, and other output versions are planned for the coming months.

The HQA120 has been qualified using methods consistent with MIL-STD-883 & 202, and offers a two screening and operating temperature options.  The M-Grade has functional testing in cold, hot and room ambient temperatures, and an extended 96 hour burn-in with ten-cycle temperature testing.  The S-Grade has functional testing at room ambient temperature and a standard burn-in period.  The full load operating temperature for the M-Grade is -55 to +115°C and -40 to +115°C for the S-Grade.

Two baseplate mounting versions are available.  The flanged format measures 60.6mm x 55.9 mm x 12.7 mm, with the non-flanged following the standard quarter brick format and measuring 60.6mm x 39 mm x 12.7 mm.  Negative logic remote on/off and remote sense is provided. 

All models are fully regulated, have a constant switching frequency for easier system EMC integration and utilise no opto-couplers in the control loop for increased reliability.   Full auto-recovery protection is provided and the output can be adjusted ±10% or turned on or off remotely.

Safety certification includes IEC/EN 60950-1, UL/CSA 60950-1 with CE marking for the Low Voltage and RoHS2 Directives.  Input to output and input to baseplate isolation is 2250Vdc.

For more information visit the TDK-Lambda website at:

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