FIGURE 1 - Typical Application
UC1854
UC2854
UC3854
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 V
RMS
. 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
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.
8
TI [ TEXAS INSTRUMENTS ]
