●Description
●The A8504 is a multi-output WLED driver for medium display backlighting. The A8504 integrates a boost converter and eight current-sinks to provide a WLED/RGB backlight driver. The boost converter can provide output voltage up to 47 V. The flexible channel selection control and high voltage capability allow a wide range of LED backlight applications.
●▪ Thin notebook displays
●▪LCD TV
●▪RGB backlight
●▪GPS systems
●▪ Portable DVD players
●Features and Benefits
●▪ Active current sharing between 6 LED strings for ±1.3% typical current matching
●▪ ±1.2% typical current accuracy
●▪ Drive up to 11 series × 8 parallel = 88 LEDs (Vf = 3.5 V, If = 40 mA)
●▪ External PWM control for LED dimming
●▪ An external resistor for LED current setting
●▪ Boost converter with integrated 50 V, 2 A DMOS
●▪ LED sinks rated for 45 mA
●▪ 200 kHz to 2 MHz switching frequency
●▪ Open LED disconnect
●▪ Boost current limit, thermal shutdown, and soft start
●▪ No audible ceramic capacitor noise during PWM dimming
●▪ Adjustable overvoltage protection (OVP)
●▪ No pull-up resistors required for LED modules that use ESD capacitors
