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Cluster Mode, 4 LED Strings with Independent Brightness Control
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SNVU382A – April 2014 – Revised June 2014
Copyright © 2014, Texas Instruments Incorporated
Quick Start Guide
D.8
Cluster Mode, 4 LED Strings with Independent Brightness Control
Following the demo setup for cluster mode allows evaluation of the EVM and LED boards with boost
providing supply to all four LED strings by disabling boost adaptive mode. Because of this, the LED
current is also limited to avoid overheating.
In normal operation an LED string in cluster mode must be connected to a separate supply instead of the
LP8860-Q1 boost, if string(s) in display mode use(s) boost for powering.
The procedure for testing cluster mode:
1. Make sure LED brightness is 0%. Also check that PLL is disabled in
LED drivers
tab, if you have
changed PLL settings from original settings.
2. Unlock EEPROM, if it is not done already.
3. Load EEPROM set-up file for cluster mode, “Cluster mode EEPROM.eep”. This file contains a ready
setup for demo cluster mode operation: