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C2471
Datasheet
RDFC Controllers for Offline Applications up to 6 W
Product data
Page 3 of 18
DS-1639-0805
© Cambridge Semiconductor Ltd 2008
02-May-2008
TYPICAL APPLICATION CIRCUIT
The C2471 controllers are intended primarily for single input voltage AC/DC applications, such as
replacement of line frequency linear transformer power supplies. These versatile controllers support a wide
range of applications at low cost. A typical circuit configuration is shown in Figure 3.
+
+
R2
Rcs
VDD
GND
CS
AUX
COL
BAS
Q1
Cp
Ccol
+
-
+
Cin1
Cin2
Rht2
Cdd
Rdd
Raux
Caux
Daux
Lfilt
Csnub
Rsnub
Dout
Cout
0V
HT
Dbridge
Fuse
Vauxs
RDFC
Controller IC
Rfuse
Dcol1
Rcol
Dcol2
Figure 3: Typical Low Power RDFC Application Schematic
Typical Cordless Phone Adapters Using C2471
The RDFC topology and CamSemi’s C2471 controller deliver class-leading performance in cordless phone
charger applications up to 6 W. Here are two examples of what can be typically achieved.
Input
110 Vac
230 Vac
Rated power
6 W
3 W
Output
9 Vdc, 660 mA
9 Vdc, 330 mA
Transformer core
E13
Average efficiency
80 %
No-load power input
150 mW
EMI compliance
EN 55022 and FCC part 68 (TIA-968-A)
Note: The C2471 controller is rated for applications up to 6 W.
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