Backlight and LCD Bias Reference Design for 90-Hz Refresh-Rate Virtual/Augmented Reality Displays TIDA-01635 (ACTIVE)

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Key Document

Description

This reference design describes the power solution for LCD displays in wearable devices, especially in augmented-reality (AR) and virtual reality (VR) headsets. The high current accuracy backlight driver is achieved by LP8556, which provides high current during small duty cycle synchronized with refresh rate. The LCD bias power driver is provided by TPS65132, which is simple to use and has a small package. The detailed design theory, component selection, and test results are also discussed.

Features
  • Strobe backlight with 90Hz
  • Support 50mA with 6 channels
  • Backlight on with 10% duty burst mode
  • Supports one Li-ion battery input or 12-V adaptor input

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Design Files

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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LP8556  6 Channel High-Efficiency/Efficacy LED Backlight Driver  LED drivers  Sample & Buy View Design Kits & Evaluation Modules
TPS563201  4.5 V to 17 V input, 3 A output, synchronous step-down converter in Eco-mode  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS61089  12.6-V, 7-A Fully-Integrated Synchronous Boost Converters in 2.0-mm x 2.5-mm VQFN Package  Step-up (boost)  Sample & Buy View Design Kits & Evaluation Modules
TPS65132  Split-Rail, Single Inductor Dual Output Converter with Positive and Negative Outputs  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LP8556 Download Download
TPS563201 Download Download
TPS61089 Download Download
TPS65132 Download -
Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 2928 22 Oct 2018
Design files (5)
Title Type Size (KB) Date
PDF 832 22 Oct 2018
PDF 137 22 Oct 2018
PDF 55 22 Oct 2018
PDF 148 22 Oct 2018
ZIP 1866 22 Oct 2018

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