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    Electronicdesign 5065 Xl 64350 Sm
    1. Technologies
    2. Power

    Offline PFC Regulator Needs No Opto

    Dec. 14, 2011
    The LT3798 isolated flyback controller with single stage active power factor correction (PFC) achieves a power factor greater than 0.97 by actively modulating the input current.
    Staff

    Electronicdesign Com Products Power Offline Pfc Regulator Needs No Opto
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    The LT3798 isolated flyback controller with single stage active power factor correction (PFC) achieves a power factor greater than 0.97 by actively modulating the input current. This eliminates the need for an extra switching power stage. Also, no opto-isolator or signal transformer is required for feedback since the output voltage is sensed from the primary-side flyback signal. Efficiencies greater than 86% are possible with output power levels up to 100W. The device’s input voltage range is dependent on the choice of external components and it can operate over a 90 to 277 Vac range, scalable higher or lower. Available in a thermally enhanced 16-pin MSOP, pricing starts at $2.25 each/1,000. LINEAR TECHNOLOGY CORP., Milpitas, CA. (800) 454-6327.

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