Board-mount DC-DCs for harsh environment railway applications

A new range of RECOM DC-DCs for railway applications set a standard for power density and cost-effectiveness with 40W output in an industry-standard 2“ x 1” x 0.4” (50.8mm x 25.4mm x 10.2mm) board-mount through-pin package. The regulated and isolated RPA40-FR series offers a 36-160V input range (200V/1 sec) which comprises rail nominals of 72V, 96V, and 110V with surges and dips. Low-noise, single and dual outputs provided are 5V, 5.1V, 12V, 15V, 24V, +/-12V and +/-15V with the single outputs’ trimmable minimum +/-10% (15V and 24V models are trimmable to +20/-10%). No minimum load is needed.

The efficiency of the series peaks at 90%, which, with advanced thermal design, permits operation with natural convection to high temperatures without derating up to 105C ambient with lowered load and/or airflow. Protection is incorporated against over-temperature, input under-voltage, output over-current, and short circuits. A control pin is also supplied to shut down the DC-DCs into a low dissipation state.

Safety certifications include UL/EN/IEC 62368-1, EN 45545-2, and EN 50155, with a reinforced isolation rating of 3kVAC/1 min. EMC specification EN 55032 class A is fulfilled without external components, while class B can be fulfilled with a simple external filter network. Reliability is heightened with an MTBF of 1.25MHrs at 25C according to MIL-HDBK 217-F (GB), making these rugged, encapsulated parts highly appropriate for harsh rail environments for general industrial environments use.

Matthew Dauterive, DC-DC product manager of RECOM, comments: “We have pushed power density boundaries even further with these 40W products for the rail market without compromising performance and flexibility”.

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