Datasheet

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UDG-01071
C53
1 COMP
2 FB
3 CS
4 RT/CT
8REF
7VCC
6OUT
5GND
UCC28C44
R6
C13
R16
T1
R12
C5
C12
D50
C52
D51
C3
R10
R11
C18C1A
F1
BR1
+
RT1
L50
C54
R55
R53
R56
C55
R52
SEC
COMMON
12 V
OUT
R50
C50
C51
R50
IC3
R54
A R
K
Q1
5 V
OUT
AC INPUT
100 Vac - 240 Vac
EMI FILTER
REQUIRED
D2
D6
IC2
IC2
UCC28C4x-EP
BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
SGLS352B – DECEMBER 2006 – REVISED MAY 2007
APPLICATION INFORMATION (continued)
Figure 4. Typical Off-Line Application
Figure 5 shows the forward converter with synchronous rectification. This application provides 48 V to 3.3 V at
10 A with over 85% efficiency, and uses the UCC28C42 as the secondary-side controller and UCC3961 as the
primary-side startup control device.
10
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