Wide input DC-DC converters for railway and transportation

May 16, 2018 // By Nick Flaherty
Powerbox has launched four new series of 8W to 20W board-mounted DC-DC converters with a wide input range of 13:1 for railway and transportation industry.

The MAD33 (8W), MAD32 (10W), MAE35 (15W) and MAF35 (20W) have an input voltage range of 12V to 160V to provide systems designers with a single part number that is able to power a large range of transportation industry applications such as railway, industrial automation and automotive and remote radio-control. This reduces inventory, time to market and documentation.

“Time to market is very important for systems designers as is simplicity of the sourcing / supply chains in order to reduce downtime in the case of trains maintenance or hardware upgrades. Both are driving forces behind extra-wide input range converters and we see similar demands from other industries such industrial automotive,” said Martin Fredmark, Powerbox’s VP Portfolio Management. “Designing 13:1 input range DC/DC converters is very challenging in order to optimize all parameters while keeping the highest possible efficiency levels across the whole input voltage range, and we are proud that our designers achieved this in the new MAD-MAE-MAF series.”

he MAD-MAE-MAF series are designed to meet railway specifications EN50155, EN50121-3-2, EN61373 and EN45545, but as well ISO7637-2 for 24V vehicles, and EN12895 for industrial trucks and other industrial applications such as robotics. The 8W MAD33 is packaged in an industry standard DIP24 case, and the MAD32, MAE35 and MAF35 in a 50.8 x 25.4 mm (2x1 in) case. All four series have a typical efficiency rating of 86%.

With the development of connected devices and Internet of Things (IoT), the number of points-of-interaction and sensors are rapidly increasing. Systems designers are facing challenging situations by having to develop products able to operate in many different applications powered by a large range of voltages. As an example, the railway standard EN50155 specifies no less than six different bus voltages (24V, 37.5V, 48V, 72V, 96V and 110V) including brownout (voltage drops) and transient surges during start-up. Considering many equipment could be connected to any of those six voltages, system designers have to be able to guarantee


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