High performance 120W DC-DC converters for harsh environments

TDK-Lambda has introduced new 12V, 24V and 28V output HQA DC-DC converters - with additional output voltage models to be added in the coming months. Packaged in a ruggedised quarter-brick form factor, the encapsulated HQA120 models can deliver 120W output power and will operate over a 9V to 40V input range (50V for 1 second). The 89% efficient converters are particularly suitable for use in COTS, communications and industrial equipment. 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 -55C to +115C and -40C to +115C for the S-Grade. Two baseplate mounting versions are available. The flanged format measures 60.6mm x 55.9mm x 12.7mm, with the non-flanged following the standard quarter-brick format and measuring 60.6mm x 39mm x 12.7mm. 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, says the company.