LX24132A中文资料LED Drivers数据手册Microchip规格书

描述 Description

Consider LX24232, supporting Sony's 3D requirements for new designs.The LX24132A is a 32 Port Display Backlight LED Controller. The device is part of a chipset where each LX24132A is capable of controlling four LX23108L 8 Port LED Drivers. Each LX23108L 8 Port LED Driver contains eight FETs driving and controlling up to 4 x 8 LED channels, where each channel is capable of driving a current of up to 200mA. The LX24132A's internal power supply control circuitry adjusts the voltage level of an external LED power source. This is done by regulating the LED supply voltage to the optimum level, thus minimizing the system power loss. At the same time, accurate current regulation for each of the 32 LED strings is maintained. The LX24132A 32 Port Display Backlight LED Controller is configured through the SPI interface which speeds up communication and reduces the number of control signals between the LX24132A and the Host system (FPGA, Video Processor, CPU). The LX24132A supports a daisy chain connection in cases where more than 32 different LED Controllers (different PWM/Duty cycle) are required. PWM output signals can be synchronized with an external Video Processor V-Sync signal. Each one of the 32 PWM channels can be enabled/disabled by external one out of four SCAN0-3 input pins. The LX24132A 32 Port Display Backlight LED Controller can detect three types of system faults on each of its 32 channels (over-temperature, open LEDs and short LEDs). After detecting the faults the unit takes the required measures to protect the system.

特性 Features

·White or RGB LEDs Backlight controller for large size display panels
·Up to 32 LED strings with ±2% precision current matching
·Wide dimming ratio with PWM and LED current amplitude control
·12-bit PWM duty-cycle resolution and 8-bit resolution for LED current setting
·LED power supply voltage control
·Automatic minimum FET Vd report
·SPI communication interface
·Open string, short LED and over-temperature protection for each individual channel
·On-chip thermal monitoring
·Synchronization to external input pulse (Sync-In)
·Enable/Disable PWM output by four input pins (SCAN0-3)
·Internal power supply trimming DAC
  ROHS, PB Free