Recently, one powerful power supply carries 300W for desktop mount without cooling fan has been made out by TRUMPower named TMA300, which can with high efficiency upto 88%, and also meet the energy efficiency level VI standards!

Always power supply like this high power when working for application must with high temperature. however, this even without cooling fan and without high temperature. The series offers six standard single output models of 12VDC, 19VDC 24VDC, 28VDC, 48VDC, or 54VDC with continuous output power of up to 300W. 

The TMA300 series is approved by UL, cUL and TUV to IEC/EN 60601-1 3rd Edition, ANSI/AAMI ES 60601-1:2005 and CAN/CSA-C22.2 No. 60601-1:08 medical standards and IEC/EN/UL 60950-1 2nd Edition ITE standards. EMC performance complies with EN60601-1-2 EN55011, EN55022, EN55024, FCC Parts 15 & 18 Class B.

The power supply accepts a 90 to 264 VAC universal input with 0.9 active power factor. The earth leakage current is 250 µA maximum @ 264 VAC, 63 Hz. Withstand voltage is specific at 5656 VDC from input to output and 2121 VDC from input to ground. The units can operate at 0°C to +60°C ambient temperature. MTBF is higher than 220,000 hours at full load, 25°C ambient, calculated per Bellcore TR-332. Output protections include short-circuit, over voltage, and over load. The power supply displays efficiency higher than 88% and carries CE marking and is RoHS compliant as well.