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LED-Hintergrundbeleuchtungstreiber

LP8555

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Hocheffizienter LED-Hintergrundbeleuchtungstreiber für Tablet-PCs

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LP8555

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Produktdetails

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 (— mm × — mm)
  • 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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Technische Dokumentation

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Top-Dokumentation Typ Titel Format-Optionen Neueste englische Version herunterladen Datum
* Datenblatt LP8555 High-Efficiency LED Backlight Driver for Tablet PCs datasheet PDF | HTML 21.02.2014
Whitepaper Common LED Functions and LED Driver Design Considerations 21.09.2020
Anwendungshinweis Some Guidelines and Tips for the LED Driver Application 14.08.2019

Design und Entwicklung

Weitere Bedingungen oder erforderliche Ressourcen enthält gegebenenfalls die Detailseite, die Sie durch Klicken auf einen der unten stehenden Titel erreichen.

Treiber oder Bibliothek

LP8550SW-LINUX — Linux-Treiber für LP8550

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
  • (...)
Unterstützte Produkte und Hardware
GUI für Evaluierungsmodul (EVM)

SNVC127 — LP8555 Evaluation Software

Unterstützte Produkte und Hardware
Gehäuse Pins CAD-Symbole, Footprints und 3D-Modelle
DSBGA (YFQ) 36 Ultra Librarian
Es gelten die allgemeinen Geschäftsbedingungen von TI für Evaluierungsartikel.

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