Test Setup
9
SNVU685A – December 2019 – Revised June 2020
Copyright © 2019–2020, Texas Instruments Incorporated
LP8866EVM User's Guide
Figure 8. LP8866EVM Register Map Page
2.7
Instructions for Standalone Evaluation
The LP8866EVM 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 below:
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 modifications above are as follows:
1. Connect a 12-V external power supply between the power input terminals VBAT+ and GNDin on the
LP8866EVM.
2. Connect LP886X-LEDLAOD-EVM board (6 strings, 8 LEDs per string) to J10 on the LP8866EVM.
3. Turn on the external power supply.