VX78-500-W Non-Isolated DC-DC Converters CUI Inc VX78-500-W Non-Isolated DC-DC Converters feature a 7.5W maximum output power rating, up to 95% efficiency range, and 4.75VDC to 36VDC input voltage range. The VX78-500-W series offers a low profile, output short-circuit protection, and is pin-out compatible with linear regulations. CUI Inc VX78-500-W Non-Isolated DC-DC Converters operate in a wide temperature range of -40°C to +85°C.