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1.2 kW low profile AC-DC module for industrial and medical

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By Nick Flaherty


Japanese power giant COSEL has launched a 1.2 kW, compact and low profile, onboard AC-DC module for medical and industrial designs.

The TUNS1200 has an input voltage range of 85VAC to 305VAC and is packaged in a sealed plastic case with aluminum baseplate with a height of 12.7 mm (0.5”) and a weight under 280g. Compared to existing 1kW onboard AC-DC modules, the TUNS1200’s footprint is a third smaller while delivering 21 percent more power. The unit can be operated from -40C to +100C baseplate temperatures, although depending on cooling and assembly method, a power derating may apply. It can be paralleled up to nine units (up to 9,750W) and the output voltage can be adjusted down to zero volts, and is easily set to constant voltage or constant current operating modes.

The range includes a 50W quarter brick, 100W half brick and 300, 500 and 700W full brick units. The TUNS1200 delivers its full power up to +85 degrees centigrade baseplate temperature, and is able to operate safely at up to +100 degrees centigrade with a derating.

The TUNS1200 series has three output voltages, the TUNS1200F12 (12V / 84A), TUNS1200F28 (28V / 43A) and the TUNS1200F48 (48V / 25A). Output voltage can be adjusted +/- 20% (-20% /+10% for the 48V) using the trimming pin, though the TUNS1200 series include an active Voltage Trimming input (VTRM) making it possible to adjust the output voltage down to zero by applying an external voltage source. Using the latest technology, the TUNS1200 has a power efficiency of 92 percent typical and a power factor of 0.98 at 100V.

For applications such as battery chargers requiring constant current (CC), the TUNS1200 includes a dedicated pin (ITRM) and by applying a DC voltage or connecting a resistor to the –S terminal it is possible to set the constant current from just above zero to the desired current.

In applications where more power is required and physical height is an issue it is possible to connect up to nine TUNS1200s in parallel, delivering up to 9,750W in conduction cooling mode. When connected units in parallel and utilizing the Current Balance (CB) pin, the COSEL active current sharing ensures that each module delivers the correct amount of current to the load.

The AC module measures 117.3 x 86.8 x 12.7 mm (4.62 x 3.42 x 0.5 inch). The unit includes four mounting holes for fixing the unit to a cold plate or an additional heatsink. The standard unit comes with M3 threaded mounting holes, and a 3.4 millimeter non-threaded mounting insert option is available (option T).

The units have a 3,000VAC input to output isolation voltage (2MOOP), 2,000VAC input to ground (1MOOP) and 500VAC output to ground. Overcurrent, overvoltage and thermal protection are included as standard.

Suitable for industrial and medical applications, the TUNS1200 complies with the safety agency approvals: UL62368-1, EN62368-1, C-UL (equivalent to CAN/CSA-C22.2 No.62368-1 ), ANSI/AAMI ES60601-1, EN60601-1 3rd, C-UL (equivalent to CAN/CSA-C22.2 No.60601-1), and complies with IEC60601-1-2 4th. The TUNS1200 includes an active filter, complying with the harmonic attenuation IEC61000-3-2 (Class A).

Benefiting from a design optimized for conduction cooling, the TUNS1200 is suitable for applications requiring a silent power solution such as in a surgery room. Equally, it is suitable for industrial applications when forced air ventilation is impossible due to environmental constraints. Attached to a chassis or cold plate, the TUNS1200 can deliver impressive power with a high level of reliability.

The power supply complies with the RoHS directive and is CE marked in accordance with the Low Voltage Directive.

www.coseleurope.eu/Products/AC-DC/TUNS

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