Compact 1" square package with 'Hold Up' functionality

The RCD20U is a DC-DC converter series, available now from Luso Electronics, offering high performance and reliability for railway and industrial applications. It is supplied in a compact 1"x1" industrial standard package and offers up to 20W output power. These converters feature an 8:1 or 12:1 ultra-wide input voltage range of 9-75VDC and 14-160VDC, which simplify the design of the power stage of a system. Employing only one converter for different supply voltages (24, 28, 36, 48, 72, 96, 110VDC) in other regions evades multiple input voltage models in the warehouse.

The patented enhanced Hold-Up Function is intended to simplify the design of supply interruption and changeover as per EN 50155. Commonly, to keep the device functioning through the supply voltage interruption or changeover, capacitors must be installed at the input terminals. The capacitance and rated voltage of the capacitors differ according to the supply voltage in use. The BUS pin of the device offers a stable and fixed charging voltage which enables the use of only one Hold-Up capacitor for any input voltages and, in addition, decreases the in-rush current at the start-up phase.

This series comprises single output and dual output models with 5, 5.1, 12, 24, ±12, ±15VDC. It has different self-protection functions such as over-current protection, output short-circuit protection, output over-voltage protection, adjustable input under-voltage lockout and over-temperature protection. By installing a heatsink on the module, these converters attain the operating temperature class OT4 and the extended operating temperatures ST1, as per EN 50155 standards.

This series is certified according to IEC/EN/UL 62368-1, EN 50155 and EN 45545-2 standards (pending). Furthermore, shock and vibration levels are compliant with EN 61373 and MIL-STD-810F. With an operating altitude of up to 5000m, a wide operating ambient temperature of -40C to +105C and a 12:1 input voltage range make these converters suitable for any ruggedised, high-reliability applications, including as rolling stocks and transportation in harsh industrial environments.