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背光 LED 驅動器

LP8555

現行

適用平板電腦的高效 LED 背光驅動器

立即訂購
產品規格表

LP8555

現行
產品規格表 立即訂購

產品詳細資料

Number of channels 12 Vin (min) (V) 2.7 Vin (max) (V) 20 Vout (min) (V) 7 Vout (max) (V) 28 Type Inductive Switching frequency (max) (kHz) 1000 Duty cycle (max) (%) 100 LED current per channel (mA) 50 Peak efficiency (%) 93 Topology Boost Features Adjustable Switch Frequency, Analog/PWM mixed dimming, CABC, Edge Rate Control, I2C control, Integrated Switch, OVP, PWM control, Thermal shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
Number of channels 12 Vin (min) (V) 2.7 Vin (max) (V) 20 Vout (min) (V) 7 Vout (max) (V) 28 Type Inductive Switching frequency (max) (kHz) 1000 Duty cycle (max) (%) 100 LED current per channel (mA) 50 Peak efficiency (%) 93 Topology Boost Features Adjustable Switch Frequency, Analog/PWM mixed dimming, CABC, Edge Rate Control, I2C control, Integrated Switch, OVP, PWM control, Thermal shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
DSBGA (YFQ) 36 6.75999999999999792000000000000016 mm² 2.5999999999999996 x 2.5999999999999996
  • Dual High-Efficiency DC/DC Boost Converters
  • 2.7-V to 20-V VDD Range
  • 12 50-mA High-Precision LED Current
    Sinks With 12-Bit Brightness Control
  • Adaptive LED Current Sink Headroom
    Controls for Maximum System Efficiency
  • LED String Count Auto-Detection
  • Phase-Shifted PWM Mode for Reduced Audible
    Noise
  • PWM Input Duty-Cycle and/or I2C-Register
    Brightness Control
  • Hybrid PWM and Current Dimming for Higher LED
    Drive Optical Efficiency
  • Flexible CABC Support
  • EPROM, I2C-Register, or External Resistors
    for Configuration
  • Improved Boost EMI Performance with Slew-Rate Control,
    Spread Spectrum, and Phase-Shifted Switching
  • Extensive Fault Detection Schemes
  • Dual High-Efficiency DC/DC Boost Converters
  • 2.7-V to 20-V VDD Range
  • 12 50-mA High-Precision LED Current
    Sinks With 12-Bit Brightness Control
  • Adaptive LED Current Sink Headroom
    Controls for Maximum System Efficiency
  • LED String Count Auto-Detection
  • Phase-Shifted PWM Mode for Reduced Audible
    Noise
  • PWM Input Duty-Cycle and/or I2C-Register
    Brightness Control
  • Hybrid PWM and Current Dimming for Higher LED
    Drive Optical Efficiency
  • Flexible CABC Support
  • EPROM, I2C-Register, or External Resistors
    for Configuration
  • Improved Boost EMI Performance with Slew-Rate Control,
    Spread Spectrum, and Phase-Shifted Switching
  • Extensive Fault Detection Schemes

The LP8555 is a high efficiency LED driver with integrated dual DC-DC boost converters. It has 12 high-precision current sinks that can be controlled by a PWM input signal, an I2C master, or both.

Dual-boost configuration of LP8555 shares the load to two inductors and allows thinner overall solution size and better efficiency compared to single-boost solutions. 12 LED strings allows driving high number of LEDs with optimal efficiency since boost conversion ratio can be kept low.

The boost converter has adaptive output voltage control based on the LED current sink headroom voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in all conditions.

The LED string auto-detect function enables use of the same device in systems with 2 to 12 LED strings for the maximum design flexibility. Proprietary Hybrid PWM and Current dimming mode enables additional system power savings. Phase-shift PWM allows reduced audible noise and smaller boost output capacitors. Flexible CABC support combines brightness level selections based on the PWM input and I2C commands.

The LP8555 is a high efficiency LED driver with integrated dual DC-DC boost converters. It has 12 high-precision current sinks that can be controlled by a PWM input signal, an I2C master, or both.

Dual-boost configuration of LP8555 shares the load to two inductors and allows thinner overall solution size and better efficiency compared to single-boost solutions. 12 LED strings allows driving high number of LEDs with optimal efficiency since boost conversion ratio can be kept low.

The boost converter has adaptive output voltage control based on the LED current sink headroom voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in all conditions.

The LED string auto-detect function enables use of the same device in systems with 2 to 12 LED strings for the maximum design flexibility. Proprietary Hybrid PWM and Current dimming mode enables additional system power savings. Phase-shift PWM allows reduced audible noise and smaller boost output capacitors. Flexible CABC support combines brightness level selections based on the PWM input and I2C commands.

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類型 標題 日期
* Data sheet LP8555 High-Efficiency LED Backlight Driver for Tablet PCs datasheet PDF | HTML 2014年 2月 21日
White paper Common LED Functions and LED Driver Design Considerations 2020年 9月 21日
Application note Some Guidelines and Tips for the LED Driver Application 2019年 8月 14日
User guide Using the LP8555 Evaluation Module 2014年 2月 21日

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

LP8555EVM — 高效率 LED 背光驅動器評估模組

The Texas Instruments LP8555EVM evaluation module (EVM) helps designers evaluate the operation and performance of this device. The LP8555EVM uses the LP8555 to drive up to 12 LED strings for LCD backlighting with high efficiency. Information about output voltage and current ratings of LP8555EVM can (...)

使用指南: PDF
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驅動程式或資料庫

LP8550SW-LINUX — 適用於 LP8550 的 Linux 驅動程式

The Linux driver supports the LP8550/1/2/3/5/6 and LP8557. The Linux driver supports communication through the I2C bus and interfaces with the backlight and PWM sub-system.

 

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

Supported Devices:

  • lp8550
  • lp8551
  • lp8552
  • (...)
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開發模組 (EVM) 的 GUI

SNVC127 — LP8555 Evaluation Software

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產品
背光 LED 驅動器
LP8555 — 適用平板電腦的高效 LED 背光驅動器
硬體開發
開發板
LP8555EVM — 高效率 LED 背光驅動器評估模組
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模擬工具

PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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DSBGA (YFQ) 36 檢視選項
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