SLUU077C – September 2000 – Revised November 2002
8
UCC3817 BiCMOS Power Factor Preregulator
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
25
50
75
100
125
150
175
200
225
250
Power Factor
POUT – Output Power – W
VIN = 265 V
VIN = 175 V
VIN = 85 V
POWER FACTOR
vs.
OUTPUT POWER
Figure 4.
6
Additional Information
For more information, pin description and specifications for the UCC3817 PFC Controller, please refer to the
UCC3817 datasheet, TI Literature Number SLUS395, or contact the Texas Instruments Semiconductor Product
Information Center at 1–800–336–5236 or 1–972–644–5580. Product information can also be found on the at
http://www.ti.com.
This evaluation module can also be used to evaluate the performance of the UCC3818 PFC control IC by
removing R16 and applying the bias voltage to the VCC pin through a separate bias supply.