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Description

The A8500 is a multi-output WLED driver for medium display backlighting. The A8500 integrates a boost converter and eight current-sinks to provide a flexible 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. The A8500 can support any application requiring 4 to 96 WLEDs. The boost converter is a constant frequency current-mode converter.

Features and Benefits

? Active current sharing between LED strings for ±1.5 typical current matching and ±1.2 typical accuracy

? Drive up to 12 series × 8 parallel = 96 LEDs (Vf = 3.2 V, If = 20 mA)

? Flexible dimming, using alternative methods:

? LED duty cycle control (PWM pin)

? DC current using serial programming (EN pin)

? DC current using external PWM signal (APWM pin)

? An external resistor

? Boost converter with integrated 50 V, 2 A DMOS

? LED sinks rated for 30 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

Applications include:

? Thin notebook displays

? LCD TV

? RGB backlight

? GPS systems

? Portable DVD players