RT8543 - Richtek

RT8543 6-String 43V White LED Driver

The RT8543 is a high efficiency white LED driver. It is designed for LCD panel that employs an LED array as the lighting source. An integrated switch current mode Boost controller drives six strings in parallel and supports up to 10 pieces of LEDs per string. The internal current sinks support maximum ±2% current matching for excellent brightness uniformity .

Features

 Wide Input Voltage : VIN 2.5V to 24V
 High Output Voltage : VOUT up to 43V
 Current Mode Boost Regulator  600kHz to 1.2MHz Switching Frequency  Up to 85% High Frequency
 Adjustable Full Channel Current from 5mA to 50mA and Matched to 2%
 Channel Current Regulation with ±3% Accuracy
 Dimming Controls  Direct PWM Dimming up to 20kHz and Minimum On-Time to 500ns  PWM to Analog Dimming up to 20kHz with 8 bit resolution
 Built-In Soft-Start to Prevent Inrush Current without External Capacitor
 Disconnects LED in Shutdown
 Protection  Strings Open Detection  Current Limit Protection .