SLVAFI8 February   2023 TLC6C5748-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Design Considerations for Low EMI
    1. 2.1 Design Considerations Overview
    2. 2.2 Considerations in Detail
      1. 2.2.1 Top-Level Architecture
      2. 2.2.2 High Frequency Signals
        1. 2.2.2.1  Original Setup
        2. 2.2.2.2  3.3 V I/O Voltage Instead of 5 V
        3. 2.2.2.3  Use Independent OSC for GSCLK With Spread Spectrum
        4. 2.2.2.4  Without Using Buffer on GSCLK
        5. 2.2.2.5  Using Snubber on GSCLK
        6. 2.2.2.6  Lower the Signal Frequency
        7. 2.2.2.7  Placement and PCB layout
        8. 2.2.2.8  ESD Enhancement
        9. 2.2.2.9  Demo and Test Results
        10. 2.2.2.10 Bench Test Results
  5. 3Summary
  6. 4References

2.2.2.9 Demo and Test Results

A demo has been designed and tested to prove the information shared in GUID-4423C242-AB9A-4EE5-92B9-B676165AB2AB.html#GUID-4423C242-AB9A-4EE5-92B9-B676165AB2AB. The test setup is shown as #FIG_SNL_5Y4_FWB.

GUID-C5FAC3B2-6D9C-42CE-A6FD-30229BA0BF1D-low.jpg Figure 2-12 Test Setup

There are two PCB boards in this demo. The system board has an MCU to generate and send out the backlighting data. Also integrated is a TPS552882-Q1 as the buck-boost converter for LED board power supply. The LED board has 336 pcs LEDs. Each zone has 1 pcs LED.

Table 2-2 lists some basic parameters of the demo.

Table 2-2 Basic Parameters
Parameter Value
Panel size 12.3 inch
Zone 320
LED configuration 1 pcs per zone
Typical LED current 15 mA
Maxim backlight power 30 W
VLED supply voltage 6 V