DLPU113A December   2021  – April 2022 DLP2021-Q1

 

  1.   Trademarks
  2. 1DLP2021-Q1 Electronics EVM Overview
    1. 1.1 Introduction
    2. 1.2 What is in the DLP2021-Q1 Light Engine EVM
      1. 1.2.1 Formatter Subsystem
      2. 1.2.2 Illumination Subsystem
      3. 1.2.3 Light Engine
      4. 1.2.4 Cables
    3. 1.3 Non-Optical Specifications
      1. 1.3.1 Electrical Specifications
      2. 1.3.2 Component Temperature Ratings
      3. 1.3.3 LED Driver Design
      4. 1.3.4 Video Specification
  3. 2Quick Start
    1. 2.1 Kit Assembly Instructions
    2. 2.2 Software Installation
    3. 2.3 Power-Up
    4. 2.4 Select Display Content
    5. 2.5 LED Driver
  4. 3Optics and Mechanics
  5. 4Software
    1. 4.1 DLP Composer
      1. 4.1.1 Default Register Configuration
      2. 4.1.2 Illumination
      3. 4.1.3 Sequence Set
      4. 4.1.4 Degamma Curves
      5. 4.1.5 Image/Video
      6. 4.1.6 Flash Blocks
      7. 4.1.7 Flash Programming
    2. 4.2 DLP Control Program
      1. 4.2.1 Connection
      2. 4.2.2 Scripting
      3. 4.2.3 Registers
      4. 4.2.4 Commands
    3. 4.3 MSP430 Example Code
  6. 5Revision History

2.5 LED Driver

The LED brightness can be controlled through PWM output from DMD controller. Using the DLP Control Program "General" tab, the PWM input text boxes (RPWM DC, GPWM DC, and BPWM DC) control the current through each LED driver channel. Note that the PWM control may exceed the maximum current specification of some LEDs in certain LED configurations. Table 2-2 provides reference conversions from PWM level to drive current for commonly used current levels.

Table 2-2 LED PWM Drive Current Conversion Reference
PWM LEVEL (10-bit) DRIVER CURRENT (mA)

0

≈ 0(1)

128

142

256

284

384

426

450

500

512

568

640

710

768

852

896

995

1024

1137
(1) Some current will continue to flow through the LED with a PWM level of 0 and light output may still be visible. To fully remove LED current, the DMD controller must be set to disable the PWM outputs.
Note: The RGB LEDs included with the DLP2021LEQ1EVM have maximum continuous forward current ratings of 0.5 A, and maximum forward current pulsed ratings of up to 1 A. Though the LED driver of the EVM is capable of driving above 1 A per channel, TI does not recommend driving beyond 500 mA for extended periods to prevent damage to the EVM due to individual component temperature ratings and thermal management limitations.