FIGURE 1 - Typical Application

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

7 CONTINENTAL BLVD.

• MERRIMACK, NH 03054

TEL. (603) 424-2410

FAX (603) 424-3460

These products contain patented circuitry and are sold under license from Pioneer Magnetics, Inc.

This diagram depicts a complete 250 Watt Preregulator. At full load, this preregulator will exhibit a power factor of 0.99

modifications to the power stage. See Design Note 39B and Application Note U-134 for further details.

UC1854

UC2854

UC3854

UDG-92056-1

8