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500W peak AC-DC supply for industrial and Body Floating rated medical applications

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By Nick Flaherty


The CMP250 series delivers up to 500 Watts of peak power for up to 60 seconds, as well as providing 250W of continuous convection-cooled power. This makes the series suitable for motor applications and other electromechanical loads without the need for fan cooling across a range of applications.

For medical applications, the CMP250 has an I/O isolation of 4 kVAC, provides 2 x MOPP (Means of Patient Protection) I/O isolation and 1 x MOPP isolation from both input to ground and output to ground, all rated at the AC input voltage. The maximum earth leakage current of 250μA coupled with a maximum patient leakage current of 80uA make the CMP250 suitable for Body Floating (BF) applications, targeting a range of equipment such as surgical tools, motorised beds and chairs used in life support and imaging products. The series is also suited to a variety of industrial and IT applications, especially supporting those applications that have requirements for long-duration peak currents to drive equipment such as printers and other electromechanical loads.

The supply’s peak-power capability of 500 W offers reduced expenditure for companies, rather than implementing a power supply that is rated for continuous operation at more than 250 W. Operating over the –40 to +70 °C temperature range with derating above +50 °C, the series offers a typical high efficiency of 89% along with a very flat efficiency curve across the entire load range. The efficiency performance means less dissipated heat enabling a convection-cooled design and negating the need for system fan cooling.

It has a 1U-high chassis and operates from a universal 80 to 264 VAC input, offering outputs of 24, 36 or 48 VDC. Other key features of the unit include constant-current overload characteristics, a 5V/1.5A standby output and a 12V/0.6A auxiliary output. Additional features include remote sense, output inhibit, AC OK/Power Fail signal and the ability to current share up to three units in parallel. The footprint is 190.5 x 101.6 x 39.9mm but the series also comes in a covered version with dimensions of 200.5 x 104.6 x 48.8mm. 

IT and medical safety application approvals for the series include IT EN/IEC/UL60950-1 and EN/IEC/UL62368-1; and ANSI/AAMI ES60601-1, EN60601-1 and IEC60601-1. The series also meets EN55032/11 Class B conducted and Class A radiated emissions. The ability to meet Class B radiated emissions is also possible with additional external components.

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