Modular power supply has BF-ready isolation and very low acoustic noise

TDK Corporation has introduced the TDK-Lambda brand 1U high MU4 series of AC/DC modular power supplies. The product’s very low acoustic noise is strongly preferred in test and medical applications where audible disturbances must be kept to a minimum. The modular series can supply up to five isolated and regulated outputs and deliver up to 800W. All models in the series provide full MOPPs isolation, including output to earth, to ease implementation into BF-rated medical applications. Other target applications comprise dental, broadcast, professional audio, test and measurement, and industrial equipment.

Intelligent fan control lowers the fan rotation speed, producing audible noise as low as 36dBA. Its microcontroller algorithm monitors the temperature of the primary converter and every output module, letting the fan speed to be altered for optimum cooling.

The low profile, 1U high device measures only 89mm x 41mm x 257.5mm (W x H x D), enabling a smaller system enclosure.

Initially, nine modules are available, providing a continuous range of voltages from 3.3V to 104V with ratings from 150W to 480W. Options comprise a 5V/2A standby voltage, fan fail signal, inhibit and enable (for individual or all outputs), DC good, PMBus communication, and current share for parallel configurations.

With efficiencies up to 90%, the series operates over 85VAC to 264VAC input, providing 800W at 180VAC to 264VAC and 600W at 90VAC to 180VAC input, derating applies below 90VAC. The maximum leakage current is 300µA – including all tolerances – and the touch current is <100µA. The power supply will function in ambient temperatures of -20C to +70C, derating linearly to 50% load above 50C.

The series provides 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.