Microsemi

Copyright

 2011

Rev. 0.1, April 2011

LX24232 - 32 Channel BackLight

LED Driver

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D ESC R I PTIO N

K E Y F E AT U RE S

The LX24232 is a 32-channel display backlight LED controller. The

device is part of a chipset consisting of the LX24232 and the LX23108A 8-

channel LED driver. Each controller is capable of controlling up to 32 LED

channels, by controlling up to four LX23108A LED drivers. Each driver

contains eight FETs and controls up to 4 x 8 LED channels, where each

channel is capable of driving a current of up to 200mA.

The LX24232 has 32 independent, frame-by-frame controlled PWM

output channels; each output channel supports independent duty-cycle

schemes, including synchronization to either rising or falling edges,

The LX24232 consists of an on-chip internal power supply control

circuitry that can be used to adjust the voltage level of an external LED

power source. This is done by regulating the LED supply voltage to the

optimum level, and thus minimizing the system power loss. At the same

time, accurate current regulation for each of the 32 LED strings is

maintained.

The LX24232 includes an on-chip analog to digital converter for drain

voltage (VD) measurements, for power supply control, fault detection and

protection.

The device is configured through the SPI interface which

speeds up communication and reduces the number of control signals

between the LX24232 and the host system (FPGA, Video Processor, and

CPU).

The LX24232 supports a daisy chain connection in case more than 32

channels are required and 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.

The LX24232 is capable of controlling up to 8 LX23108A drivers, in a

special configuration where two consecutive channels are connected

together for increased current support. Refer to the application note for

more details.

♦ White LED or RGB BackLight

driver for large size display

panels

♦ Up to 32 LED strings with

±1.5% 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

♦ SPI communication interface

♦ Open string, short LED and

over-temperature protection

for each individual channel

♦ On-chip thermal monitoring

PACKAGE ORDER INFO

Plastic 8x8mm QFN 56 pin

RoHS Compliant/Pb free

-40 to +85

°C

LX24232ILQ

Note: Available in Tape & Reel. Append the letters ”TR” to the part number. (i.e. LX24232ILQ-TR)