LP8543中文资料适用于中型 LCD 背光的 SMBus/I2C 控制型 WLED 驱动器数据手册TI规格书

描述 Description

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.

特性 Features

• High-Voltage DC/DC Boost Converter with Integrated FET
• PWM Phase Shift Control with Adaptive Boost Output to Increase Efficiency Compared to Conventional Boost Converters Topologies
• Digital Ambient Light Sensor Interface with User-Programmed Ambient Light to Backlight Brightness Curve
• Seven LED Drivers with LED Fault (Short/open) Detection
• Internal Thermal Protection and Backlight Safety Dimming Feature
• Low-Input Voltage Detection and Shutdown
• WQFN 24-Pin Package, 4 x 4 x 0.8 mm