Datasheet

UNITRODE INTEGRATED CIRCUITS
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. [phone] • FAX [phone]
APPLICATION INFORMATION: A 100 Watt Power Factor Preregulator
This circuit demonstrates a complete power factor preregulator based on the UC3852. This preregulator will supply
up to 100 watts at 400VDC and exhibit power factor greater than 0.995 with less than 10% total harmonic distortion.
Operating input range is 90V to 160V RMS at 50Hz to 60Hz.
This design is intentionally simple, yet fully functional. The UC3852 can also be used in designs featuring soft start,
over-voltage protection, wide power-line voltage operation, and fault latching. For more information on applying
the UC3852, refer to Unitrode Application Note U–132.
PARTS LIST
UC1852
UC2852
UC3852
UDG-92004
C1 0.47µF/250VAC X2 Class Polyester
C2 1nF/16V Ceramic
C3 68µF/35V Aluminum Electrolytic
C4 180pF/16V Ceramic
C5 0.1µF/16V Polyester or Ceramic
C6 82µF/450V Aluminum Electrolytic
D1 2A/500V Bridge Rectifier (Collmer
KBPC106 or Powertex MB11A02V60)
D2 100mA/50V Switching Diode (1N4148)
D3 2A/500V 250ns Recovery-Time Rectifier
(Motorola MR856)
IC1 UC3852N Power Factor Controller IC
Q1 IRF830 4.5A/500V 1.5Ω Power FET
L1 680µH (Renco RL3792 with
10 Turn 24 AWG Secondary)
R1 150kΩ,
1
⁄
4
W
R2 0.2Ω,
1
⁄
2
W Carbon Composition
R3 10Ω,
1
⁄
4
W
R4 13.3kΩ,
1
⁄
4
W
R5 1MΩ,
1
⁄
4
W
R6 20kΩ,
1
⁄
4
W
R7 200kΩ,
1
⁄
2
W
R8 200kΩ,
1
⁄
2
W
5