350W convection cooled medical power supplies released

22nd June 2021

Alex Lynn

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TDK Corporation has announced the introduction of the TDK-Lambda brand CUS350MP series of AC/DC power supplies with medical and industrial safety certifications. The series is rated at 350W convection, 500W with forced air and can deliver up to 1,000W peak power.

This makes the CUS350MP suited for low audible noise applications requiring occasional high peak power demands, including medical equipment utilising DC motors and industrial printers. These markets are often served by larger, more expensive, non-peak capable power supplies.

The CUS350MP series accepts an 85 to 265Vac input and has a leakage current of less than 300µA. Four output voltages are available: 24, 30, 36 and 48V. A 5V 0.3A isolated standby voltage and remote on/off is fitted as standard. The typical full load operating efficiency is 94% with a 230Vac input.

The operating ambient temperature is -20 to +70°C, derating linearly above 50°C to 30% load. Including the baseplate, the open frame models measure 88x183x44mm and weigh 770g. A cover, screw terminal connections, double-sided board coating and a single AC fuse are available as options.

The input to output isolation is 4,000Vac (two MoPP), input to ground 1,500Vac (one MoPP) and 1,500Vac (one MoPP) output to ground for suitability in B and BF rated medical equipment. Safety certifications include IEC/UL/CSA/EN 62368-1, IEC/EN/ES 60601-1, EN 62477-1 (OVC III), with CE marking to the Low Voltage, EMC and RoHS Directives.

The units also comply with EN 55011-B and EN 55032-B conducted and radiated emissions, meet the EN 61000-3-2 harmonics, IEC60601-1-2 Edition 4 and IEC 61000-4 immunity standards.