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Wide input DC-DC converters for railway and transportation

Wide input DC-DC converters for railway and transportation

New Products |
By Christoph Hammerschmidt



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 (2×1 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 that their equipment will operate from 14.4V to 154V, include brownout (voltage drop down to 14.4V) and a one second transient of 154V as specified in EN50155.

The converters are suitable for low power loads and devices in railway applications such as communication devices, GSM-R phones and their docking stations, routers/Wi-Fi access points, small screens, USB charging sockets (both in-seat and driver’s cabin), sensors, and standby power for larger devices.

Available in four output voltages of 5, 12, 24 and 48V in natural convection conditions, the MAD33 delivers 8W and the MAD32 10W. The MAD33 is available in a Dual In Line Packaging (31.8 x 20.3 x 12.7 mm – 1.25 x 0.8 x 0.5 inches) and the MAD32 in an industry standard 2×1 inch packaging (50.8 x 25.4 x 10.2 mm – 2.00 x 1.00 x 0.40 inches). The 15W MAE35 and 20W MAF35 are available in three output voltages of 12, 24 and 48V and are similarly provided in 2×1 packages. All series deliver full output power in ambient temperatures up to 60 degrees C and continue to deliver power with a linear derating up to the 100 degrees C case. The MAD32, MAD33, MAE35 and MAF35 are housed in plastic cases.

Designed for ruggedized environments, the MAD-MAE-MAF series meet thermal shock and vibration requirements as specified in EN61373 and MIL-STD-810F, and they all meet the Fire and Smoke EN45545-2 standard.

All models within the MAD-MAE-MAF series feature full protection level sets including input voltage lockout, short-circuit protection and current limiting. All units operate at a fixed switching frequency and including PI type input filters. The operating temperature range is from -40 to +85 ºC ambient (maximum 105 ºC case) and storage is from -55 to +125 ºC. They meet the requirements of UL60950-1, EN60950-1 and IEC60950-1 standards, and CE mark 2014/30/EU and all have an input to output isolation voltage of 3,000 VAC. The MAD-MAE-MAF series are RoHS compliant.

www.prbx.com

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