XP Power launches the CHD250 AC-DC power supply series of ultra-efficient 250 W convection cooled single-output units for applications that require medium power in an open frame, fan-less design. With a compact 3" x 5" standard footprint that fits within a 1U height, the series meets international safety approvals for industrial and medical equipment.

The CHD250 series offers a low no-load power consumption of less than 0.5 W. Featuring an almost flat efficiency curve over the entire load range, the series achieves an exceptional efficiency of between 93% and 94% typical at 230 V_AC and full load, assisting end customers in meeting energy saving criteria of green standards and minimizing waste heat. In addition, the high efficiency allows the units to be convection-cooled, eliminating the need for cooling fans, making the series especially suitable for low audible noise requirements.

The range comprises five models, providing output voltages of +12 V_DC, +15 V_DC, +24 V_DC, +28 V_DC, and +48 V_DC. Standard features include a power fail signal, output inhibit, and remote sense, plus adjustment of the output voltage by the user of +5%/-4%. To ensure that customers only pay for what they need, options for this series include a 5 V_DC / 0.5 A standby output for powering memory or logic and a covered version.

The CHD250 series meets IT 60950-1 and 3rd edition medical ANSI/AAMI ES60601-1 safety approvals (achieving 2 x MOPP), as well as EMC specifications EN55022/11 for class B conducted emissions. The supplies are capable of operating over a wide temperature range of -20°C to +70°C with no derating until +50°C.

With an industry-standard footprint of 3” x  5” x 1.43”, these units are open frame with no U bracket or L bracket heatsink.