CUS400M AC/DC Power Supply

TDK Corporation announces the introduction of the TDK-Lambda brand CUS400M AC/DC power supply series in the industry standard 3 in x 5 in footprint. Rated at 400 W with forced air, the series can continuously deliver 250 W, with peaks of up to 400 W for 30 minutes when cooled by convection or conduction. This is considerably longer than many products on the market. These power supplies are ideal for applications with occasional peak demands, including hospital beds, dental chairs, and other motor-driven products.

The CUS400M meets curve B conducted and radiated EMI in either a Class I or Class II (double insulated) construction, without the need for external filtering of shielding. The CUS400M series accepts an 85  V_AC to 264 V_AC input and is available with 12 V and 24 V outputs initially, with 15 V, 19 V, 28 V, 36 V, and 48 V models following shortly. A 5 V, 2 A or 12 V, 0.83 A standby voltage, remote on/off, remote sense, DC Good and AC Fail signals can be specified as an option.

The power supplies are available with multiple mechanical configurations. Open-frame, metal baseplate, U channel, and enclosed models are in production now, with the top fan version later in the year. The open-frame CUS400M measures 77.5 mm x 128 mm x 39.5 mm (W x L x H). The operating ambient temperature is -20°C (-30°C start-up) to +70°C, derating linearly above +50°C to 50% load.

The CUS400M has an input to output isolation of 4,000 V_AC (2x MoPP), an input to ground isolation of 1,500 V_AC (1x MoPP) and an output to ground isolation of 1,500 V_AC (1x MoPP) for suitability in B and BF rated medical equipment. The leakage current is <250 µA and the touch current is <100 µA. The maximum operating, transportation, and storage altitude is 5,000 meters.

Safety certifications include IEC/EN/ES 60601-1, IEC/EN/UL 62368-1, and IEC/EN/UL 60950-1 with CE marking for the low voltage, EMC, and RoHS directives. The units also comply with EN 55011-B and EN 55032-B conducted and radiated emissions (Class I and II), and meet the EN 61000-3-2 harmonics, IEC60601-1-2 Edition 4, and IEC 61000-4 immunity standards.

Features

• 400 W with forced-air cooling
• 250 W convection/conduction cooled with a 400 W peak for extended time periods
• Medical certifications (2x MoPP input to output)
• Class B conducted and radiated EMI
• Suitable for Class I and Class II installations
• Compact 3 in x 5 in footprint