600W modular AC-DC supplies support conduction cooling

January 03, 2018 // By Nick Flaherty
The  CM4 series is suitable for a wide range of applications, including medical equipment, test and measurement, broadcast, communications and COTS applications
TDK has launched a series of modular AC‑DC power supplies designed for conduction cooling as well as convection or system air cooling.

With both medical and industrial safety certifications, the CM4 series is suitable for a wide range of applications, including medical equipment, test and measurement, broadcast, communications and COTS applications. The advantages of conduction cooling include no fan generated audible noise or vibration and the ability to transfer heat to the system enclosure or cold-plate.

The CM4 measures 101.6 x  177.8mm and 41mm high, delivering up to 600W continuous output powerwith a peak of up to 750W for 5s.  The operating input voltage range is 85 to 264Vac, with linear derating to 425W from 120Vac to 85Vac.  Up to four single output modules can be selected, or in a series / parallel combination to provide voltages ranging from 1.5V to 232Vdc and output currents of up to 90A.  Nominal output voltages can be adjusted over a minimum range of 3:1.

When conduction cooled, the baseplate can operate at temperatures up to 105°C, with derating of the output module power and current by 2.5% per °C only required above 85°C.  The ambient air temperature range is -40 to +70°C, derating the total output power by 2.5% per °C above 50°C.  Operating efficiencies are up to 90% (configuration dependent) and the standby power consumption is less than 1W.

Functionality and signalling include a 5V 1A standby voltage, AC OK, module good, remote on/off (individual modules or the power supply), internal temperature monitor, output current monitoring, module bias supply, and remote output voltage and current programming on the S and Z modules.

The units are certified to IEC/EN/UL/CSA 60601-1, ANSI/AAMI ES 60601-1 and IEC/EN/UL/CSA 60950-1, and CE marked to the Low Voltage and RoHS2 Directives.  Input to output isolation of 4,000Vac (2 x MoPPs), 1,500Vac input to ground (1 x MoPP) and 500Vdc output to ground. The CM4 is manufactured under the control of ISO9001 and ISO13485, including risk management.

All models have a maximum earth leakage current of 200µA, while complying with the EN55011/55032-B conducted and radiated emission standards.  The units also meet the EN60601-1-2 and EN61000-4 immunity standards.  In addition, theCM4 series has been tested to relevant sections of MIL-STD-810G, MIL-STD -461F, MIL-STD -1399 and MIL‑STD‑704.

Product selection is through an online configurator,


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