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LP8550

アクティブ

ノートブック向け、高効率 LED バックライト ドライバ

ご注文はこちら
データシート

LP8550

アクティブ
データシート ご注文はこちら

製品詳細

Number of channels 6 Vin (min) (V) 5.5 Vin (max) (V) 22 Vout (min) (V) 10 Vout (max) (V) 40 Type Inductive Switching frequency (max) (kHz) 1250 Duty cycle (max) (%) 100 LED current per channel (mA) 50 Peak efficiency (%) 91 Topology Boost Features Adjustable Switch Frequency, Enable/Shutdown, I2C control, PWM control Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 6 Vin (min) (V) 5.5 Vin (max) (V) 22 Vout (min) (V) 10 Vout (max) (V) 40 Type Inductive Switching frequency (max) (kHz) 1250 Duty cycle (max) (%) 100 LED current per channel (mA) 50 Peak efficiency (%) 91 Topology Boost Features Adjustable Switch Frequency, Enable/Shutdown, I2C control, PWM control Operating temperature range (°C) -30 to 85 Rating Catalog
DSBGA (YZR) 25 7.5625 mm² (— mm × — mm)
  • High-Voltage DC/DC Boost Converter with Integrated FET
    with Four Switching Frequency Options: 156/312/625/1250 kHz
  • 2.7-V to 22-V Input Voltage Range to Support 1x to 5x Cell Li-Ion
    Batteries
  • Programmable PWM Resolution
    • 8 to 13 True Bits (Steady State)
    • Additional 1 to 3 Bits Using Dithering During Brightness
      Changes
  • I2C and PWM Brightness Control
  • Automatic PWM & Current Dimming for Improved Efficiency
  • PWM output frequency and LED Current set through Resistors
  • Optional Synchronization to Display VSYNC Signal
  • Six LED Outputs with LED Fault (Short/Open) Detection
  • Low Input Voltage, Overtemperature, Overcurrent Detection,
    and Shutdown
  • Minimum Number of External Components
  • High-Voltage DC/DC Boost Converter with Integrated FET
    with Four Switching Frequency Options: 156/312/625/1250 kHz
  • 2.7-V to 22-V Input Voltage Range to Support 1x to 5x Cell Li-Ion
    Batteries
  • Programmable PWM Resolution
    • 8 to 13 True Bits (Steady State)
    • Additional 1 to 3 Bits Using Dithering During Brightness
      Changes
  • I2C and PWM Brightness Control
  • Automatic PWM & Current Dimming for Improved Efficiency
  • PWM output frequency and LED Current set through Resistors
  • Optional Synchronization to Display VSYNC Signal
  • Six LED Outputs with LED Fault (Short/Open) Detection
  • Low Input Voltage, Overtemperature, Overcurrent Detection,
    and Shutdown
  • Minimum Number of External Components

The LP8550 is a white-LED driver with integrated boost converter. It has six adjustable current sinks which can be controlled by PWM input or with I2C-compatible serial interface. The boost converter has adaptive output voltage control based on the LED driver voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in all conditions.

LED outputs have 8-bit current resolution and up to 13-bit PWM resolution with additional 1- to 3-bit dithering to achieve smooth and precise brightness control. Proprietary Phase Shift PWM control is used for LED outputs to reduce peak current from the boost converter, thus making the boost capacitors smaller. The Phase Shifting scheme also eliminates audible noise.

Automatic PWM dimming at lower brightness values and current dimming at higher brightness values can be used to improve the optical efficiency. Internal EEPROM is used for storing the configuration data. This makes it possible to have minimum external component count and make the solution very small.

The LP8550 has safety features which make it possible to detect LED outputs with open or short fault — low input voltage and boost overcurrent conditions are monitored, and chip is turned off in case of these events. Thermal de-rating function prevents overheating of the device by reducing backlight brightness when set temperature has been reached.

The LP8550 is a white-LED driver with integrated boost converter. It has six adjustable current sinks which can be controlled by PWM input or with I2C-compatible serial interface. The boost converter has adaptive output voltage control based on the LED driver voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in all conditions.

LED outputs have 8-bit current resolution and up to 13-bit PWM resolution with additional 1- to 3-bit dithering to achieve smooth and precise brightness control. Proprietary Phase Shift PWM control is used for LED outputs to reduce peak current from the boost converter, thus making the boost capacitors smaller. The Phase Shifting scheme also eliminates audible noise.

Automatic PWM dimming at lower brightness values and current dimming at higher brightness values can be used to improve the optical efficiency. Internal EEPROM is used for storing the configuration data. This makes it possible to have minimum external component count and make the solution very small.

The LP8550 has safety features which make it possible to detect LED outputs with open or short fault — low input voltage and boost overcurrent conditions are monitored, and chip is turned off in case of these events. Thermal de-rating function prevents overheating of the device by reducing backlight brightness when set temperature has been reached.
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技術資料

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上位の文書 タイプ タイトル フォーマットオプション 最新の英語版をダウンロード 日付
* データシート LP8550 High-Efficiency LED Backlight Driver for Notebooks データシート (Rev. E) PDF | HTML 2014/09/09
アプリケーション・ノート Some Guidelines and Tips for the LED Driver Application 2019/08/14
セレクション・ガイド 電源 IC セレクション・ガイド 2018 (Rev. R 翻訳版) 英語版 (Rev.R) 2018/09/13
アプリケーション・ノート Power Budget for Backlight Drivers 2013/06/27
アプリケーション・ノート Increasing Full-Load Efficiency of a Backlight Driver 2013/06/05

設計と開発

その他のアイテムや必要なリソースを参照するには、以下のタイトルをクリックして詳細ページをご覧ください。

ドライバまたはライブラリ

LP8550SW-LINUX — LP8550 向け Linux ドライバ

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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DSBGA (YZR) 25 Ultra Librarian
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