TDK Corporation announces the introduction of the TDK-Lambda brand MU4 series of 1U high power supplies. Featuring very low acoustic noise and BF-ready medical isolation, the MU4 can provide 600W with an input of 85 to 264Vac (derate below 90Vac) and 800W with a 180 to 264Vac input. Up to five fully isolated output voltages can be easily configured using TDK-Lambda’s online quick product finder. Target applications include medical, dental, broadcast, professional audio, test and measurement, and industrial equipment requiring a low 41mm height and/or low audible noise.
A patented intelligent fan speed control circuit uses a microcontroller algorithm to monitor the temperature of the primary converter and each individual secondary module. This enables the fan speed to be accurately adjusted and optimized to provide an audible noise as low as 36dBA, even with an 80% load. A low noise level improves patient comfort and reduces operator fatigue.
Initially, nine 150W to 400W rated output modules are available, providing continuous coverage from 3.3V to 104Vdc. Each module includes remote on/off, remote sense, and a good output signal as standard. Options for the MU4 include a 5V / 2A standby voltage, fan fail signal, inhibit and enable for all outputs, AC fail, PMBus communication, and current share for configurations requiring a parallel operation.
The product has efficiencies of up to 90% and will operate in ambient temperatures of -20°C to +70°C, derating linearly to 50% load above 50°C. The earth leakage current is less than 300µA – including all tolerances, and the touch current is <100µA. The size is a compact 89 x 41 x 257.5mm, 3.5 x 1.61 x 10.1 inches, (W x H x D). A seven-year warranty is provided as standard.
The MU4 series has an input-to-output isolation of 4,000Vac (2 x MoPP), an input-to-earth isolation of 1,500Vac (1 x MoPP), and an output-to-earth isolation of 1,500Vac (1 x MoPP) for suitability in B and BF rated medical equipment. Safety certification is to IEC/EN 60601-1, ES 60601-1. IEC/EN/CSA/UL 62368-1, (IEC/EN 61010-1 designed to meet) and is CE / UKCA marked to the Low Voltage, EMC, and RoHS EU Directives and UK regulations. The models meet EN 55011-B, EN 55032-B radiated and conducted emissions and comply with EN 60601-1-2:2015 (Edition 4) and EN 61000-4 immunity standards.
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