Description

The A850493911N is an electronic component backshell and cable clamp product category. It is a multi-output WLED (white light-emitting diode) driver that can be used for medium display backlighting. This driver integrates a boost converter and eight current-sinks, which allows a wide range of LED backlight applications. The boost converter can provide an output voltage up to 47 volts.

Specifications and features

The A850493911N has the following 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 (pulse-width modulation) control for LED dimming
• An external resistor for LED current setting
• Boost converter with integrated 50 V, 2 A DMOS (double-diffused metal-oxide-semiconductor)
• 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 (electrostatic discharge) capacitors

Application Scenarios

The A850493911N can be used for various LED backlight applications, including:

• Thin notebook displays
• LCD TV
• RGB (red, green, blue) backlight
• GPS (global positioning system) systems
• Portable DVD players

Comparison

After reviewing the features and applications of the A850493911N, the following are its advantages and disadvantages:

• The A850493911N has an active current sharing function for current matching, leading to more stable LED performance.
• The flexible channel selection control and high voltage capability allow a wide range of LED backlight applications.
• The boost converter can provide up to 47 volts of output voltage, which is suitable for medium display backlighting.
• The A850493911N has adjustable overvoltage protection for safety.

• The A850493911N has a maximum LED sink rating of 45 mA, limiting the number of LEDs it can drive simultaneously.
• The A850493911N requires an external resistor for LED current setting, which can add to the overall cost of the product.
• The A850493911N has a relatively low switching frequency range of 200 kHz to 2 MHz, which may limit its compatibility with certain LED modules.