AN2840 Datasheet, PDF (1/19 Pages) STMicroelectronics – charger demonstration board based on the VIPER17HN

AN2840
Application note
EVLVIP17-5WCHG: 5 W low standby consumption battery
charger demonstration board based on the VIPER17HN
Introduction
The EVLVIP17-5WCHG demonstration board is a 5 W SMPS for use as a travel battery
charger for applications such as mobile phones, PDAs and electronic games. The purpose
of the board is to demonstrate the performance of the VIPER17HN off-line high voltage
converter. Thanks to its low consumption and other features, good electrical performance is
achieved. To obtain constant output voltage and current regulation (CV/CC), the TSM1052
CV/CC controller is used on the secondary side. This TSM1052 is well-suited for this type of
application, offering very low current consumption in a very small package (SOT23-6L).
Another important feature of the SMPS is the elimination of the Y1 safety capacitor between
the primary and the secondary side.
Figure 1. EVLVIP17-5WCHG demonstration board (top side)
Figure 2. EVLVIP17-5WCHG demonstration board (bottom side)
December 2008
Rev 1
1/19
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