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背光 LED 驅動器

LP8551

現行

四通道高效 LED 背光驅動器，適用具 VDDIO PWM 邏輯位準的筆記型電腦

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產品規格表

LP8551

現行
產品規格表 立即訂購

產品詳細資料

Number of channels 4 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 I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 4 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 I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
DSBGA (YZR) 25 7.5625 mm² 2.75 x 2.75
  • High-Voltage DC/DC Boost Converter with Integrated FET;
    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
  • 50-mA High-Precision LED Current Sinks
  • Adaptive LED Current Sink Headroom Control for Maximum
    System Efficiency
  • Programmable PWM Resolution 8 to 13 Bits
  • I2C and PWM Input Duty Cycle Brightness Control
  • PWM Output Frequency and LED Current Set Through Resistors
  • 4 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;
    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
  • 50-mA High-Precision LED Current Sinks
  • Adaptive LED Current Sink Headroom Control for Maximum
    System Efficiency
  • Programmable PWM Resolution 8 to 13 Bits
  • I2C and PWM Input Duty Cycle Brightness Control
  • PWM Output Frequency and LED Current Set Through Resistors
  • 4 LED Outputs with LED Fault (short/open) Detection
  • Low Input Voltage, Overtemperature, Overcurrent Detection,
    and Shutdown
  • Minimum Number of External Components

The LP8551 is a white LED driver with integrated boost converter. It has four 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 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.

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 LP8551 has safety features which make it possible to detect LED outputs with open or short fault. As well, 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 LP8551 is a white LED driver with integrated boost converter. It has four 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 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.

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 LP8551 has safety features which make it possible to detect LED outputs with open or short fault. As well, 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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類型 標題 日期
* Data sheet LP8551 High-Efficiency LED Backlight Driver for Notebooks datasheet (Rev. E) PDF | HTML 2014年 9月 2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

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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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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 (YZR) 25 檢視選項
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