250W AC-DC converter delivers 400W for extended periods

May 11, 2020 //By Nick Flaherty
The TDK-Lambda brand CUS400M 3” x 5” medical and industrial AC-DC converter delivers 250W convection/conduction cooled with 400W peak power for extended time periods
The TDK-Lambda brand CUS400M 3” x 5” medical and industrial AC-DC converter delivers 250W convection/conduction cooled with 400W peak power for 30 minutes

TDK has launched a 250W AC-DC converter for medical and industrial designs that can provide 400W of power for extended periods up to 30minutes when convection cooled.

The TDK-Lambda brand CUS400M medical and industrial certified AC-DC converter is packaged in the industry standard 3” x 5” (77.5mm x 128mm x 39.5mm) footprint. With forced air, the series can provide 400W and 250W can be supplied when convection cooled with a peak capability of up to 400W. The duration period of that peak is up to 30 minutes (40°C ambient, 230Vac input) with a maximum duty cycle of 50 percent. This is considerably longer than most products on the market and makes the power supply suitable for designs with a relatively low quiescent power consumption and occasional peak demand, including hospital beds, dental chairs and incubators.

Initially, 12V and 24V outputs are available, with the release of 15V, 19V, 28V, 36V and 48V models planned for later in 2020. All models accept an 85 to 264Vac input and have a no-load power consumption of less than 1.3W, when the output is inhibited. A 5V 2A or 12V 1A standby voltage, remote on/off, remote sense, AC fail and an output good signal are optional.

The series has a choice of mechanical configurations. Open frame, baseplate, U-channel and enclosed versions are available now and a top mounted fan version later in the year. To optimise cooling, the underside of the CUS400M circuit board is fitted into a thermally conductive, insulated plastic base (patent pending). This allows heat from the surface mounted power components to be dissipated into a cold plate or the system chassis. The overall size of the open frame model is 77.5mm x 128mm x 39.5mm (W x L x H).

The medical and industrial 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, IEC 60601‑1‑2 Edition 4 and IEC 61000‑4 immunity standards.

The CUS400M has an input to output isolation of 4,000Vac (2 x MoPP), an input to ground


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