LCD Bias Power Reference Design

(ACTIVE) PMP9770

Description & Features

Technical Documents

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Description

This reference design delivers a low cost LCD bias power circuit using the boost converter IC TPS61085. The solution provides all four voltages required by the thin film transistor (TFT) LCD display. The TPS61085 boost converter generates the AVDD voltage. Two external charge pump circuits provide the positive VGH and negative VGL bias voltage for the TFT. One external op-amp LM7321MF acts as a high current buffer; it provides the VCOM voltage for the TFT backplane.

Features
  • Discrete solution for LCD bias power
  • Low cost and small size
  • A high current buffer is also provided
  • This circuit has been tested on a reference design board

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.


  



Schematic/Block Diagram

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Test Data

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Design Files

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Bill of Materials (BOM)

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM7321  Single Ch, RRIO, High Output Current & Unlimited Cap Load +/-15V Op Amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS61085  18.5V, 2A, 650kHz / 1.2MHz Step-Up DC-DC Converter w/ Forced PWM Mode  Step-up (boost)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM7321 Download Download
Download Download
TPS61085 Download Download
Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views
PDF 751 10 Dec 2014 4
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 624 13 Jan 2015 1 1
ZIP 94140 13 Jan 2015 0
PDF 521 13 Jan 2015 0
PDF 92 13 Jan 2015 0
PDF 120 13 Jan 2015 0
PDF 27 13 Jan 2015 3

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