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1 Introduction
User's Guide
SLVU150 – January 2006
TPS61059EVM-141
This user’s guide describes the characteristics, operation, and use of the
TPS6105xEVM-141 evaluation module (EVM). This EVM demonstrates the Texas
Instruments TPS6105x synchronous boost converter with down mode used to power
high-current, white-light LEDs for photo flash applications. This user’s guide includes
setup instructions, a schematic diagram, a bill of materials (BOM), and PCB layout
drawings for the evaluation module.
Contents
1 Introduction .......................................................................................... 1
2 Setup ................................................................................................. 2
3 Board Layout ...................................................................................... 10
4 Schematic and Bill of Materials ................................................................. 12
5 Related Documentation From Texas Instruments ............................................ 14
List of Figures
1 Timing From LED Off to 700-mA Flash .......................................................... 4
2 Timing From 200-mA Movie Light to 700-mA Flash ........................................... 5
3 Timing From LED Off to 700-mA Flash .......................................................... 6
4 Timing Between Flashes .......................................................................... 7
5 Timing Between Flashes Using Pushbutton .................................................... 8
6 LED Flash Interrupted With FLASH OFF Input ................................................. 9
7 Efficiency ............................................................................................. 9
8 Assembly Layer ................................................................................... 10
9 Top Layer Routing ................................................................................ 11
10 Bottom Layer Routing ............................................................................ 12
11 TPS6105xEVM-141 Schematic ................................................................. 13
List of Tables
1 J3 Pin Functions .................................................................................... 2
2 HPA141A Bill of Materials........................................................................ 14
The Texas Instruments TPS6105xEVM-141 evaluation module (EVM) helps designers evaluate the
operation and performance of the TPS61058 or TPS61059 high-current boost converters for white-light
photo flash applications. The TPS6105x has an externally programmed LED current so that the LED can
be used as a flash for still photography and as a torch, or movie light, for digital movies.
The EVM has one white-flash LED, the TPS6105x converter, and a timing circuit used to make the EVM a
stand-alone flash module.
If desired, other LEDs or LED current settings can be tested on the EVM by changing the feedback
resistors on the EVM. See the TPS6105x data sheet for information on calculating new resistor values.
SLVU150 – January 2006 TPS61059EVM-141 1
