Converters target harsh environments

Jon Lawson

TDK has introduced a range of 120W DC-DC converters aimed at harsh environments.

The encapsulated quarter brick HQA120 family can deliver 120W output power and operate over a 9V to 40V input range, providing up to 50V for 1 second. The current members of the family provide outputs of 12V, 24V and 28V, with additional output voltage models to be added in the coming months.

These 89% efficient converters are suitable for use in COTS, communications and industrial equipment and have been qualified using methods consistent with MIL-STD- 883 with 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, while 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.

There are two baseplate mounting versions 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 also provided.

All models in the family are fully regulated, have a constant switching frequency for easier system EMC integration and do not use opto-couplers in the control loop to provide increased reliability in harsh environments. 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.