SLVUDK8 October   2026

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specifications
      1. 1.3.1 Electrical Specifications
      2. 1.3.2 Component Temperature Ratings - DLP3940SQ1EVM
      3. 1.3.3 SPI and I2C Timing
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 DLP3940SQ1EVM Block Diagram
    2. 2.2 Controller PCB
    3. 2.3 RGB LED Driver PCB - DLP3940SQ1
    4. 2.4 Optical Engine Requirements
  8. 3Software
    1. 3.1 Software Installation
    2. 3.2 Quick Start
      1. 3.2.1 Kit Assembly Instructions
      2. 3.2.2 Powering-Up EVM
      3. 3.2.3 Steps to Reprogram the Onboard Flash Memory
    3. 3.3 Connecting EVM to the DLPC230-Q1 Control Program via SPI
    4. 3.4 Connecting EVM to the DLPC230-Q1 Control Program via USB
  9. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials (BOM)
  10. 5Additional Information
    1. 5.1 Trademarks

2.3 RGB LED Driver PCB - DLP3940SQ1

The DLP3940SQ1EVM can operate as a standalone system with just the controller board and the DMD board, but the EVM can be combined with an RGB LED design. The LED driver board shown in Figure 2-3 is controlled and monitored by the controller PCB over a flex cable. Power can be input to the LED driver board from a bench top supply or through a 12V, 5A barrel jack power supply. Depending on operating conditions, some parts and surfaces of the PCB can be hot.

The LED driver board has the following primary functions:

  • Provides reverse bias protection and supplies power to controller board over a separate cable.
  • Regulates input power to 6.5V or 8V prior to the LED driver circuitry.
  • Has outputs for red, green, and blue LEDs, but other LEDs can be used.
CAUTION:
DLP3940SQ1EVM

The LED driver board can reach temperatures above 55°C without proper cooling and airflow. Contact can cause burns!

CAUTION:
DLP3940SQ1EVM

LED drivers (J5, J6, J7) can produce high currents of 6.5A or 8A. Do not remove these headers, and do not touch the contact points during operation!

DLP3940SQ1EVM LED Driver PCB - DLP3940SQ1EVMFigure 2-3 LED Driver PCB - DLP3940SQ1EVM

The LED driver PCB contains the ports listed in Table 2-4.

Table 2-4 RGB LED Driver PCB Ports
SCHEMATIC REFERENCEFUNCTION
J1Input power
J2Input power (optional)
J3Controller power
J4Controller-driver control interface
J5Blue LED output - high current output up to 6A, locking and keyed connector
J6Green LED output - high current output up to 6A, locking and keyed connector
J7Red LED output - high current output up to 6A, locking and keyed connector

The LED driver PCB contains the headers listed in Table 2-5. H2 selects the LED drive voltage. Place a jumper across pins 1 and 2 for 6.5V drive. Place a jumper across pins 2 and 3 for 8V drive. Do not hot-swap this jumper; remove and replace only with power disconnected from the board.

Table 2-5 LED Driver Header Pins
HEADERPIN1PIN2PIN3
H1Pre-regulated drive voltage
(6.5V or 8V)		GNDGND
H2Feedback voltage connection
for 6.5V drive		Pre-regulator feedback voltageFeedback voltage connection
for 8V drive