Harsh environment DC/DC converters offer up to 92% efficiency

6th July 2017

Alice Matthews

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Additional models have been introduced to TDK's HQA series of harsh environment DC/DC converters. The series now includes both 85 and 120W ratings with output voltages of 5, 12, 15, 24, 28 and 48V. The input voltage is 9-40V for the 5-28V units and 18-40V for the 48V unit. All models can withstand a 50V surge for 1s. With efficiencies of up to 92%, the HQA series is suited for use in COTS, communications and industrial equipment.

The HQA series has been qualified using methods consistent with MIL-STD-883, and offers two screening and operating temperature options. The HQA120 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 (HQA85 and HQA120) has functional testing in hot and room ambient temperatures and the 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.

A constant switching frequency enables easier EMC system compliance and, without the use of optocouplers in the control loops, high temperature long-term reliability is increased. All models feature auto-recovery protection for both input under voltage and output overload. The outputs can be adjusted using the trim function by ±10%, and turned on or off remotely.

Two baseplate mounting versions are available. The flanged format measures 60.6x55.9x12.7mm, with the non-flanged following the standard quarter brick format and measuring 60.6x39x12.7mm.

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.