SNVU731 November   2020 LP8864-Q1

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Features
    2. 1.2 Applications
  3. 2Test Setup
    1. 2.1 LP8864EVM Kit
    2. 2.2 System and Equipment Requirements
    3. 2.3 Hardware Setup
    4. 2.4 Software Installation
    5. 2.5 Quick Start-Up Procedure
    6. 2.6 Additional GUI Functions
      1. 2.6.1 Monitor Faults Page
      2. 2.6.2 Diagnostics Page
      3. 2.6.3 Register Map Page
    7. 2.7 Instructions for Standalone Evaluation
  4. 3LP8864EVM Board Layout
  5. 4LP8864EVM Schematic
  6. 5 LP8864EVM Bill of Materials
  7. 6LED Load Board

2.7 Instructions for Standalone Evaluation

The LP8864EVM can be used for standalone evaluation (without GUI software and PC connection). To support standalone mode, it must be modified from its default settings as described in the following list:

  1. Mount R20 to pull up EN input.
  2. Change pullup and pulldown resistors to select spread spectrum enable (R18) or disable (R25) option.
  3. Mount R19 to pull up PWM input for 100% brightness. If brightness needs to be changed from 100%, connect external PWM source at PWM pin.

The minimum procedures for turning on the LEDs after the previously-listed modifications are as follows:

  1. Connect a 12-V external power supply between the power input terminals VBAT+ and GNDin on the LP8864EVM.
  2. Connect the LP886X-LEDLAOD-EVM board (4 strings, 8 LEDs per string) to J10 on the LP8864EVM.
  3. Turn on the external power supply.