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LP8556

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6 通道高效 LED 背光驱动器

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数据表

LP8556

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数据表 立即订购

产品详情

Number of channels 6 Vin (min) (V) 2.7 Vin (max) (V) 20 Vout (min) (V) 7 Vout (max) (V) 48 Type Inductive Switching frequency (max) (kHz) 1250 Duty cycle (max) (%) 100 LED current per channel (mA) 50 Peak efficiency (%) 95 Topology Boost Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 6 Vin (min) (V) 2.7 Vin (max) (V) 20 Vout (min) (V) 7 Vout (max) (V) 48 Type Inductive Switching frequency (max) (kHz) 1250 Duty cycle (max) (%) 100 LED current per channel (mA) 50 Peak efficiency (%) 95 Topology Boost Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
DSBGA (YFQ) 20 3.96 mm² (— mm × — mm) WQFN (RTW) 24 16 mm² (4 mm × 4 mm)
  • High-efficiency DC/DC boost converter with integrated 0.19-Ω power MOSFET and three switching frequency options: 312 kHz, 625 kHz, and 1250 kHz
  • 2.7-V to 36-V Boost switch input voltage range supports multi-cell Li-Ion batteries
    (2.7-V to 20-V VDD input range)
  • 7-V to 43-V Boost switch output voltage range supports as few as 3 WLEDs in series per channel and as many as 12
  • Configurable channel count (1 to 6)
  • Up to 50 mA per channel
  • PWM and / or I2C brightness control
  • Phase-shift PWM mode reduces audible noise
  • Adaptive dimming for higher LED drive optical efficiency
  • Programmable edge-rate control and spread spectrum scheme minimize switching noise and improve EMI performance
  • LED fault (short and open) detection, UVLO, TSD, OCP, and OVP (up to 6 threshold options)
  • Available in tiny 20-pin, 0.4-mm pitch DSBGA package and 24-pin, 0.5-mm pitch WQFN package
  • High-efficiency DC/DC boost converter with integrated 0.19-Ω power MOSFET and three switching frequency options: 312 kHz, 625 kHz, and 1250 kHz
  • 2.7-V to 36-V Boost switch input voltage range supports multi-cell Li-Ion batteries
    (2.7-V to 20-V VDD input range)
  • 7-V to 43-V Boost switch output voltage range supports as few as 3 WLEDs in series per channel and as many as 12
  • Configurable channel count (1 to 6)
  • Up to 50 mA per channel
  • PWM and / or I2C brightness control
  • Phase-shift PWM mode reduces audible noise
  • Adaptive dimming for higher LED drive optical efficiency
  • Programmable edge-rate control and spread spectrum scheme minimize switching noise and improve EMI performance
  • LED fault (short and open) detection, UVLO, TSD, OCP, and OVP (up to 6 threshold options)
  • Available in tiny 20-pin, 0.4-mm pitch DSBGA package and 24-pin, 0.5-mm pitch WQFN package

The LP8556 device is a white-LED driver featuring an asynchronous boost converter and six high precision current sinks that can be controlled by a PWM signal or an I2C master.

The boost converter uses adaptive output voltage control for setting the optimal LED driver voltages as low as 7 V and as high as 43 V. This feature minimizes the power consumption by adjusting the output voltage to the lowest sufficient level under all conditions. The converter can operate at three switching frequencies: 312 kHz, 625 kHz, and 1250 kHz, which can be set with an external resistor or pre-configured via EPROM. Programmable slew rate control and spread spectrum scheme minimize switching noise and improve EMI performance.

LED current sinks can be set with the PWM dimming resolution of up to 15 bits. Proprietary adaptive dimming mode allows higher system power saving. In addition, phase shifted LED PWM dimming allows reduced audible noise and smaller boost output capacitors.

The LP8556 device has a full set of fault-protection features that ensure robust operation of the device and external components. The set consists of input undervoltage lockout (UVLO), thermal shutdown (TSD), overcurrent protection (OCP), up to 6 levels of overvoltage protection (OVP), LED open and short detection.

The LP8556 device operates over the ambient temperature range of –30°C to +85°C. It is available in space-saving 20-pin DSBGA and 24-pad WQFN packages.

The LP8556 device is a white-LED driver featuring an asynchronous boost converter and six high precision current sinks that can be controlled by a PWM signal or an I2C master.

The boost converter uses adaptive output voltage control for setting the optimal LED driver voltages as low as 7 V and as high as 43 V. This feature minimizes the power consumption by adjusting the output voltage to the lowest sufficient level under all conditions. The converter can operate at three switching frequencies: 312 kHz, 625 kHz, and 1250 kHz, which can be set with an external resistor or pre-configured via EPROM. Programmable slew rate control and spread spectrum scheme minimize switching noise and improve EMI performance.

LED current sinks can be set with the PWM dimming resolution of up to 15 bits. Proprietary adaptive dimming mode allows higher system power saving. In addition, phase shifted LED PWM dimming allows reduced audible noise and smaller boost output capacitors.

The LP8556 device has a full set of fault-protection features that ensure robust operation of the device and external components. The set consists of input undervoltage lockout (UVLO), thermal shutdown (TSD), overcurrent protection (OCP), up to 6 levels of overvoltage protection (OVP), LED open and short detection.

The LP8556 device operates over the ambient temperature range of –30°C to +85°C. It is available in space-saving 20-pin DSBGA and 24-pad WQFN packages.
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技术文档

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顶层文档 类型 标题 格式选项 下载最新的英语版本 日期
* 数据表 LP8556 High-Efficiency LED Backlight Driver For Tablets 数据表 (Rev. M) PDF | HTML 2020-6-10
白皮书 常见 LED 功能和 LED 驱动器设计注意事项 英语版 2020-9-21
应用手册 Some Guidelines and Tips for the LED Driver Application 2019-8-14
应用手册 AN-1112 DSBGA Wafer Level Chip Scale Package (Rev. AI) 2019-6-14
应用手册 基于LP8556实现万阶调光 2019-6-13
选择指南 电源管理指南 2018 2018-7-31
应用手册 Inductor Selection in Boost Converters for LCD Backlight Applications 2016-10-24
应用手册 Schottky Diode Selection in Asynchronous Boost Converters 2016-9-6
应用手册 Power Budget for Backlight Drivers 2013-6-27
应用手册 Increasing Full-Load Efficiency of a Backlight Driver 2013-6-5

设计与开发

如需其他信息或资源，请点击以下任一标题进入详情页面查看（如有）。

评估板

LP8556SQ-EVM — LP8556SQ-EVM

The Texas Instruments LP8556SQ-EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LP8556 High-Efficiency LED Backlight Driver. The device features high efficiency boost DC-DC converted and 6 high-precision current sinks that can be controlled by either a PWM (...)

用户指南: PDF
支持的产品和硬件
有库存
限制：
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无货
评估板

LP8556TM-EVM — LP8556TM-EVM

The Texas Instruments LP8556TM-EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LP8556 High-Efficiency LED Backlight Driver. The device features high efficiency boost DC-DC converted and 6 high-precision current sinks that can be controlled by either a PWM (...)

用户指南: PDF
支持的产品和硬件
有库存
限制：
??asset.out-of-stock-ti_zh_CN??
无货
驱动程序或库

LP8550SW-LINUX — 适用于 LP8550 的 Linux 驱动程序

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
  • (...)
支持的产品和硬件
参考设计

TIDA-01635 — 适用于 90Hz 刷新速率虚拟/增强现实显示的背光和 LCD 偏置参考设计

此参考设计介绍了可穿戴设备，尤其是增强现实 (AR) 和虚拟现实 (VR) 耳机中 LCD 显示屏的电源解决方案。LP8556 实现了高电流精度背光驱动器，可在低占空比期间提供与刷新率同步的高电流。该 LCD 辅助电源驱动器由采用小型封装的易用型 TPS65132 提供。此外还讨论了详细的设计原理、元件选型和测试结果。

支持的产品和硬件
封装 引脚 CAD 符号、封装和 3D 模型
DSBGA (YFQ) 20 Ultra Librarian
WQFN (RTW) 24 Ultra Librarian
适用于评估类项目的 TI 标准条款与条件。

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