LX24232 Datasheet, PDF (1/2 Pages) Microsemi Corporation – 32 Channel BackLight LED Driver

PRODUCT BRIEF
TM
®
LX24232 - 32 Channel BackLight
LED Driver
DESCRIPTION
KEY FEATURES
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
and phase delay control. It uses a V_sync input for flexible synchronization
schemes, including synchronization to either rising or falling edges, _♦
optimal V_sync jitter support, as well as single or multiple PWM cycles per
frame support, and loss of V_sync support.
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
T_A (°C)
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)
Copyright  2011
Rev. 0.1, April 2011
Microsemi