December 2008

Rev 1

1/19

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)

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