650W modular AC-DC power supply shrinks in size

June 19, 2019 //By Nick Flaherty
650W QM4 modular AC-DC power supply shrinks in size
TDK has shrunk its 650W QM4 modular AC-DC power supply range, reducing the footprint by 15%.

The 108mm wide QM4 modular AC-DC power supply range accepts up to four single or dual output modules and a dual output standby/signal board to provide up to 10 outputs. All the models in the range have low acoustic noise and full MOPPs isolation. With medical and industrial safety certifications, the QM series is suitable for applications such as BF rated medical equipment, test and measurement, broadcast, communications and renewable energy.

The QM4 can deliver 650W output power with a 180-264Vac input and 550W with a wide range 90-264Vac input. Output voltages from 2.8V to 105.6V can be specified and an optional standby/signal module can be fitted. This provides a choice of one or two standby voltages (5V, 12V and 13.5V at up to 2A), a PMBus communication interface, unit inhibit or enable, and an AC Good signal.

The modular AC-DC power supply units can operate in ambient temperatures of -20 to +70ºC, derating output power and output current by 2.5% per ºC above 50ºC. Overall case dimensions are a compact 108 x 63.5 x 270mm (W x H x D), and the weight is between 1.125kg and 1.845kg, depending on the module configuration. The QM series’ operating efficiency is up to 91%, reducing internal heat losses and allowing the use of a low speed, low audible noise fan for cooling.

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