SLVU240B May   2008  – August 2018 MSP430F2131 , TPS62260

 

  1.   Read This First
    1.     About This Manual
    2.     How to Use This Manual
    3.     Information About Cautions and Warnings
    4.     Related Documentation From Texas Instruments
    5.     If You Need Assistance
    6.     Trademarks
  2. 1Introduction
    1. 1.1 Requirements
      1. 1.1.1 Power Supply Requirements
      2. 1.1.2 Printed Circuit Board Assemblies (PCBs)
  3. 2Setup
    1. 2.1 Input/Output Connector Descriptions
      1. 2.1.1 J1, J2, and J3 – Power Supply Connectors
      2. 2.1.2 JP1 – Wireless Interface Connector
      3. 2.1.3 JP2 – JTAG Interface Connector
    2. 2.2 Hardware Setup
  4. 3Supported Colors and Operation Modes
    1. 3.1 Color Range
    2. 3.2 Auto-Scroll Mode
    3. 3.3 Manual Control Mode
  5. 4Design Description
    1. 4.1 Hardware Design
      1. 4.1.1 LED Power Stages
      2. 4.1.2 Output Filter Design
      3. 4.1.3 MODE and EN Pins
      4. 4.1.4 MSP430 MCU Design
    2. 4.2 LED Color Table
    3. 4.3 Firmware Design
      1. 4.3.1 Firmware C-Code Listing
  6. 5Schematic and Bill of Materials
    1. 5.1 Schematics
    2. 5.2 Bill of Materials
  7. 6Board Layout
    1. 6.1 Photographs of Top and Bottom
    2. 6.2 Layout
    3. 6.3 Thermal Images
  8. AReprogramming
    1. A.1 Additional Software and Hardware Needed
    2. A.2 IAR Embedded Workbench KickStart Software Installation
    3. A.3 Hardware Installation
    4. A.4 Using IAR Embedded Workbench to Download Code on MSP430 MCUs
  9.   Revision History

6.3 Thermal Images

Figure 6-6 and Figure 6-7 show the thermal images of two EVM boards. The image in Figure 6-6 was obtained without using a heatsink and the image in Figure 6-7 with a heatsink mounted on the bottom of the PCB. Using a heatsink not only reduces the operating temperature of each LED, it also helps significantly to spread the heat more evenly.

These images were obtained using modified firmware that forced all three LEDs to operate with a 100% dimming duty cycle, meaning that they are fully on. Using the standard firmware, each LED is on for only one third of the time and off for two thirds of the time. As a result, the heat dissipation during normal use with the standard firmware is significantly lower than in this test case.

The heatsink used was SK 477 100 fixed with the thermally conductive foil WLFT 404 R25 both from Fischer Elektronik.

noheatsink_lvu240.gifFigure 6-6 EVM Without Heatsink
withheatsink_lvu240.gifFigure 6-7 EVM With Heatsink