Universal-input, single-output SMPS has passive power factor correction

11 August 2004 Power Electronics / Power Management

Taiyo Yuden's PAS250 is the second model in its new PAS Series of passive PFC-based, switch-mode power supplies for 1U-height single-output applications.

Like the company's 150 W companion model (PAS150), the PAS250 provides economic benefits to OEMs through use of passive versus active PFC technology. Not only is active PFC more complex and less reliable than passive, says the company, but active also provides unnecessary functionality at higher cost, the result of the recent declassification of many Class D end devices to less stringent Class A harmonic distortion standards per EN61000-3-2. The PAS250 switcher not only meets all Class A PFC requirements, but also provides greater reliability and higher MTBF (mean time between failure) through use of fewer components. Also, the relative cost per Watt of a passive PFC switcher like the PAS250 is significantly less than a comparable switch-mode power supply employing active PFC techniques, according to the company.

The PAS250 switcher provides a universal 115/230 V a.c. input selection and a single output of 250 W continuous power. The user may select one of several factory-set output voltages, including 12, 24 and 48 V. It 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 optional fan. It is protected against overload, overvoltage, reverse voltage and thermal conditions. It measures 17,8 x 10,2 cm and is 38 mm high.

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