New extremely low acoustic noise modular power supply from TDK-Lambda
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TDK Corporation announces the introduction of the TDK-Lambda brand MU4 series of AC-DC modular power supplies. The product is suitable for test and medical applications where audible disturbances need to be kept to a minimum. The modular MU4 can provide up to five isolated and regulated outputs and deliver up to 800W. All models in the MU4 series feature full MOPPs (Means of Patient Protection) isolation, including output to earth, to simplify implementation into BF-rated medical applications. Other target applications include dental, test and measurement, broadcast, professional audio, and industrial equipment.
With intelligent fan control, the MU4 fan rotation speed is reduced, producing audible noise as low as 36dBA. Its microcontroller algorithm monitors the temperature of the primary converter and each output module, allowing the fan speed to be adjusted for optimum cooling.
Initially, nine modules are available, offering a continuous range of voltages from 3.3V to 104V with ratings from 150W to 480W. Options include 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 MU4 series operates over 85 to 264Vac input, providing 800W at 180 to 264Vac and 600W at 90 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 operate in ambient temperatures of -20°C to +70°C, derating linearly to 50% load above 50°C.