UC1854
UC2854
UC3854
FIGURE 1 - Typical Application
This diagram depicts a complete 250 Watt Preregulator. At full load, this preregulator will exhibit a power factor of 0.99
at any power line voltage between 80 and 260 VRMS. This same circuit can be used at higher power levels with minor
modifications to the power stage. See Design Note 39B and Application Note U-134 for further details.
UDG-92056-1
NOTE: Boost inductor can be fabricated with ARNOLD MPP toroidal core part number A-438381-2, using a 55 turn primary and a
13 turn secondary.
UNITRODE CORPORATION
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7 CONTINENTAL BLVD. MERRIMACK, NH 03054
These products contain patented circuitry and are sold under license from Pioneer Magnetics, Inc.
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TEL. (603) 424-2410 FAX (603) 424-3460
8
TI [ TEXAS INSTRUMENTS ]
