Contents
1 Read This First .................................................................................................................... 4
1.1 About this Manual........................................................................................................ 4
1.2 Related Documentation from Texas Instruments .................................................................... 4
1.3 FCC Warning ............................................................................................................. 4
1.4 If You Need Assistance ................................................................................................. 4
2 Introduction......................................................................................................................... 4
3 Description of the LP8862-Q1................................................................................................ 5
3.1 Features................................................................................................................... 5
3.2 Applications ............................................................................................................... 5
4 Hardware Setup ................................................................................................................... 6
5 Board Layout....................................................................................................................... 7
6 Start-Up of the EVM and Power Sequences............................................................................. 8
6.1 PWM input to Initiate Start-up Sequence ............................................................................. 8
6.2 Shutdown Sequence..................................................................................................... 8
7 Boost Converter................................................................................................................... 9
7.1 Switching Frequency .................................................................................................... 9
7.2 Spread Spectrum and Synchronization ............................................................................... 9
7.3 Voltage Control.......................................................................................................... 10
8 LED Current Sinks.............................................................................................................. 10
8.1 Output Configuration ................................................................................................... 10
8.2 Current Setting.......................................................................................................... 10
8.3 Brightness Control...................................................................................................... 11
9 Fault Detection................................................................................................................... 11
9.1 Fault Indicator........................................................................................................... 11
10 Evaluation Board Schematic................................................................................................ 12
11 Bill of Materials .................................................................................................................. 13
Appendix A LED Load Board ....................................................................................................... 14
Revision History.......................................................................................................................... 17
2Table of Contents SNVU478A–July 2015–Revised October 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated
