650 W Modular Power Supplies Provide MoPP Isolation

TDK has announced the introduction of the TDK-Lambda brand QM4 modular power supplies rated at 550 W to 650 W. This further extends the QM series which can provide up to 1500 W output power. The QM4 models are available with up to 10 outputs, have full MoPPs (Means of Patient Protection) isolation and low acoustic noise. With medical and industrial safety certifications, the power supplies are suitable for use in medical, test and measurement, communications and broadcast equipment.

Accepting a wide range 90 VAC to 264 VAC, 47-63 Hz input (440 Hz with reduced PFC), the QM4 can deliver 550 W at low line and 650 W with a high line 180-264 VAC input.  With its modular construction, the series can be configured using a simple on-line configurator to provide 1 to 10 independently regulated outputs and include individual output good signal and remote on/off functions. The QM series module output voltages range from 2.8 V to 105.6 V and have output power levels from 300 W to 1200 W. A further subset of option modules provides an AC Fail signal, standby voltages (up to 12 V, up to 2 A), global remote on/off and PMBus communications. Overall case dimensions for the QM4 are 108 mm x 63.3 mm x 270 mm (W x H x D).

The QM4 will operate in ambient temperatures of -20 to +70°C (-40°C start-up), with output power and output current linearly derating above 50°C to 50% at 70°C. With efficiencies of up to 91%, less internal heat is generated allowing the use of a low speed cooling fan to reduce audible noise. A lower airflow speed also significantly reduces the ingress of dirt and other contaminants, improving product reliability. All models in the QM series have a seven-year warranty as standard.

The power supply has 4,000 VAC (2 x MoPPs) input to output, 1,500 VAC (1 x MoPP) input to ground and 1,500 VAC (1 x MoPP) output to ground isolation. All models are certified to the IEC/EN/UL/CSA 60601-1, ANSI/AAMI ES 60601-1 and IEC/EN/UL/CSA 60950-1 safety standards. The QM series is also designed to meet IEC/EN61010-1 with CE marking for the Low Voltage, EMC and RoHS Directives. Earth leakage current is less than 300 µA, and complies with the EN61000-6-3:2007 and EN60601-1-2:2015 (curve B conducted and radiated) emission standards. The units also meet the EN60601-1-2 and EN61000-6-2 immunity standards and are designed and manufactured under the control of ISO9001 and ISO13485 (including risk management).

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