C2471 Datasheet
RDFC Controllers for Offline Applications up to 6 W
Product data
Page 1 of 18
DS-1639-0805
© Cambridge Semiconductor Ltd 2008
02-May-2008
ADVANTAGES
Low system component count
High average efficiency
Low no load power consumption
EMI compliance without extra components
High isolation & surge voltage withstand
High power density in very small size
FEATURES
Highly integrated CMOS controller IC
Low cost package options
Drive suitable for low cost bipolar power transistors
Resonant switching for high efficiency and low EMI
Frequency optimised for power circuit parasitics
Protection against overload, over-temperature and under-voltage
APPLICATIONS
External AC/DC charger/adapter (single voltage input) e.g. cordless phones, low power adapters.
Embedded PSU (single voltage input), audio products, domestic appliances.
OVERVIEW
The C2471 controllers use CamSemi’s low power Resonant Discontinuous Forward Converter (RDFC)
topology to create a high efficiency, low cost alternative to line-frequency transformer PSUs, for applications
up to 6 W. By operating in resonant mode, EMI is greatly reduced, enabling the replacement of linear PSUs
in demanding applications such as audio products and cordless phone chargers. The C2471 controllers also
offer overload protection which is usually associated with more expensive switch mode solutions.
Resonance
sensing
Vdd
regulator
Switch
saturation
sensing
Current
sensing
RDFC
Control
Vdd
VDD
COL
CS
GND
BAS
AUX
Base
drive
Figure 1: Block Diagram of the C2471 Controller ICs
C2471LW1
PDIP-8
C2471LX2
SOT23-6
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