Datasheet

+
–
COMP
VREF
PGND
AGND
VCC
ZCDB
CS
GDB
VINAC
VSENSE
PWMCNTL
UCC28063
TSET
PHB
HVSEN
C
IN
100
1 nF
R
Z
C
Z
R
S
C
P
R
T
12V
2.2uF
R
ZA
C
OUT
R
D
R
C
R
LOAD
R
E
R
F
R
A
R
B
50 k
PWMCNTL
20 k
C
B
C
A
F1
D3
2.2uF
C
F3
C
F2
R
P
Bridge
V
OUT
C
F4
22pF
Q2
D2
L2
R
G2
5
Q1
D1
L1
R
G1
5
R
ZB
20 k
C
F5
22pF
ZCDA
GDA
C
F1
R
UCC28063
www.ti.com SLUSAO7 –SEPTEMBER 2011
DESIGN EXAMPLE
An example of the UCC28063 PFC controller in a two-phase interleaved, transition-mode PFC pre-regulator is
shown in Figure 34.
Figure 34. Typical Interleaved Transition-Mode PFC Pre-Regulator
Design Goals
The specifications for this design were chosen based on the power requirements of a typical 300-W LCD TV.
These specifications are shown in Table 2.
Table 2. Design Specifications
PARAMETER MIN TYP MAX UNIT
V
IN
RMS input voltage 85 265
VRMS
(VIN_MIN) (VIN_MAX)
V
OUT
Output voltage 390 V
f
LINE
AC-line frequency 47 63 Hz
PF Power factor at maximum load 0.90
P
OUT
300 W
η Full-load efficiency 92%
f
MIN
Minimum switching frequency 45 kHz
Copyright © 2011, Texas Instruments Incorporated Submit Documentation Feedback 33
Product Folder Link(s): UCC28063