AN1695 Datasheet, PDF (1/5 Pages) STMicroelectronics – TSM108 EVALUATION BOARD

AN1695
APPLICATION NOTE
TSM108 EVALUATION BOARD
12V to 6V DC/DC CONVERTER
1 - Introduction
by Anthony BOIMOND
The TSM108 is a step down controller that features constant voltage and constant current regulation. It
can drive either a P-channel Mosfet or a PNP bipolar transistor. The principle of operation of the TSM108
is widely described in the application note attached to the datasheet. The goal of this document is to
describe the TSM108 Evaluation Board.
The Evaluation Board was designed to allow different converter configurations. Several options for power
semiconductor footprints are available on the PCB in order to make it adaptable to a wide range of
converter output power. In a first step, this application note will describe the typical application. Then the
various options available on the Evaluation Board PCB will be explained.
2 - TSM108 typical application
2.1 Description
The TSM108 is especially suited for cigarette lighter accessories. The typical application described in this
note is a battery charger with the following characteristics:
Input voltage: Vin = 12V
Output voltage: Vout = 6V
Maximum output current: Iout = 800mA
A picture of the Evaluation Board in the typical application configuration is shown on Figure 1. The related
schematic is described on Figure 2.
Figure 1 : TSM108 Evaluation Board
January 2003
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