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

August 11, 2020 //By Nick Flaherty
1.2 kW low profile AC-DC module for industrial and medical
Cosel's TUNS1200 280g 1.2kW AC-DC module measures 117.3 x 86.8 x 12.7 mm for medical and industrial designs

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


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