San Marcos, Calif. - Taiyo Yuden (U.S.A.) Inc.'s 150-watt PAS150 is a universal input/single output switch-mode power supply for 1U-height applications, especially telecom. The supply employs passive power-factor-correction technology instead of the more complex, less reliable active PFC technology, according to the company.
Thanks to the recent declassification of many Class D end devices to less stringent Class A standards per EN61000-3-2 harmonic distortion standards, active PFC technology now provides unnecessary functionality at higher cost, the company said.
The switcher not only meets all Class A PFC requirements, but also provides greater reliability and higher mean time between failures through the use of fewer components.
Also, the relative cost per watt of a passive PFC switcher like the PAS150 is significantly less than a comparable switch-mode power supply employing active PFC techniques.
In operation, the PAS150 switcher provides a universal 115/230-Vac input selection and a single output of 150-W continuous power. The user may select one of several factory-set output voltages, including 3.3, 5, 12, 24 and 48 V. The PAS150 switcher features optional current-sharing capability for 1+1 redundancy with no special interconnection requirement.
Other options include remote on/off, and droop or single-wire current sharing with OR-ing diodes. The standard unit provides superior heat dissipation, but is also available with an optional fan with its own 12-Vdc supply.
Other standard features include overload, overvoltage, reverse voltage and thermal protection.
The PAS150 features quick prototype delivery and highly accelerated life testing to verify design parameters and ensure 100 percent out-of-the-box operation.
The switcher measures 6 x 4 x 1.5 inches in length, width and height, and comes with a two-year warranty.
Units are priced at close to $40 each in OEM quantities. Availability is stock to eight weeks after receipt of order.
Call (760) 510-3200