LP8543 - SMBus/I2C Controlled WLED Driver for Medium Sized LCD Backlight

LP8543是TI德州仪器公司的一款背光产品，LP8543是SMBus/I2C Controlled WLED Driver for Medium Sized LCD Backlight，本站介绍了LP8543的封装应用图解、特点和优点、功能等，并给出了与LP8543相关的TI元器件型号供参考。

LP8543 - SMBus/I2C Controlled WLED Driver for Medium Sized LCD Backlight - 背光 - LED驱动器 - 德州仪器

产品描述

The LP8543 is a white LED driver with integrated boost converter. It has 7 adjustable current sinks which can be controlled by SMBus or I2C-compatible serial interface, PWM input and Ambient Light Sensor (ALS).

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. Phase Shift PWM dimming offers further power saving especially when there is poor matching in the forward voltages of the LED strings. Boost voltage can also be controlled through the SMBus/I2C.

Internal EEPROM stores the data for backlight brightness and ambient light sensor calibration. Brightness can be calibrated during the backlight unit production so that all units produce the same brightness. EEPROM also stores the coefficients for the LED control equations and the default LED current value. LED current has 8–bit adjustment from 0 to 60 mA.

The LP8543 has several safety and diagnostic features. Low-input voltage detection turns the chip off if the system gets stuck and battery fully discharges. Input voltage detection threshold is adjustable for different battery configurations. Thermal regulation reduces backlight brightness above a set temperature. LED fault detection reports open or LED short fault. Boost over-current fault detection protects the chip in case of over-current event.

LP8543 is available in the WQFN 24-pin package.

产品特性

High-Voltage DC/DC Boost Converter with Integrated FET
5.5V to 22V Input Voltage Range to Support 2x, 3x and 4x Li-Ion Batteries.
PWM Phase Shift Control with Adaptive Boost Output to Increase Efficiency Compared to Conventional Boost Converters Topologies
PWM Brightness Control for Single Wire Control and Stand-Alone Use
Digital Ambient Light Sensor Interface with User-Programmed Ambient Light to Backlight Brightness Curve
Easy-to-Use EEPROM Calibration for Current, Intensity and Ambient Light Response Setting
Seven LED Drivers with LED Fault (Short/open) Detection
Eight-Bit LED Current Control
Internal Thermal Protection and Backlight Safety Dimming Feature
Two Wire, SMBus/ I2C-Compatible Control Interface
Low-Input Voltage Detection and Shutdown
Minimum Number of External Components
WQFN 24-Pin Package, 4 x 4 x 0.8 mm

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