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AAT2430C Datasheet(PDF) 1 Page - Skyworks Solutions Inc.

Part No. AAT2430C
Description  16 Channel White LED Driver Solution with LED Current and Timing Control
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Manufacturer  SKYWORKS [Skyworks Solutions Inc.]
Direct Link  http://www.skyworksinc.com
Logo SKYWORKS - Skyworks Solutions Inc.

AAT2430C Datasheet(HTML) 1 Page - Skyworks Solutions Inc.

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AAT2430C
PRODUCT SUMMARY
16 Channel White LED Driver Solution with LED Current and Timing Control
1
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201969A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 18, 2012
General Description
The AAT2430C is a highly integrated, high efficiency white
LED backlight solution for large size LCD panels used in
LCD TVs. By controlling external power MOSFETs (such as
the Skyworks' AAT2491 high-voltage TrenchDMOS
array), the AAT2430C facilitates 16 current sink channels
to provide precision constant-current drive for strings of
white LEDs, where the number of series-connected LEDs
per string is only limited by the system LED voltage sup-
ply. Current in each backlight string and string-to-string
matching is controlled using I-Precise™ sensing and con-
trol circuitry, a novel on-chip method to accurately control
drain current in external discrete power MOSFETs inde-
pendent of their construction and without the need for
precision sense resistors.
A 15MHz SPI compatible interface allows fast, indepen-
dent digital control of each current sink. Full scale LED
current is programmed using an external resistor. DOT
correction may be applied globally to all sink channels
with 8-bit resolution. Both phase delay and grayscale
clock (GS Clock) PWM on-time are user programmable
with 12-bit resolution for each current sink channel.
Timing and synchronization are determined by exter-
nally applied VSYNC and GS Clock signals.
The AAT2430C provides latched fault handling and fault
reporting through the SPI interface and fault flag output
pin. The fault detection system reports open or short cir-
cuit LED strings and over-temperature events. The short
circuit LED detection threshold is user programmable.
The LED string supply voltage may be regulated by using
the voltage or current mode current sense feedback sig-
nal to the LED voltage regulator. This analog signal rep-
resents the highest VF string of LEDs. Thermal protection
circuitry shuts down the device in the event of an over-
temperature condition.
The AAT2430C is available in the Pb-free, thermally
enhanced 64-pin 9mm x 9mm QFN and 64-pin 14mm x
14mm LQFP packages.
Features
• V
IN Range: 10.8V – 28V
• 16 Programmable LED Current Sinks
±1.5% Accuracy @ RSET = 3.01kΩ
±1.5% Matching @ RSET = 3.01kΩ
• SPI Interface
Digitally Programmable Individual Channels
Up to 15MHz Clock Speed
Read/Write Registers
• High Resolution Digital Control for Individual
Channels
12-bit Resolution Grayscale PWM Brightness
12-bit Resolution Channel Phase Delay
 8-Bit Resolution Global Current Setting
(Dot Correction)
• VSYNC PWM and Delay Synchronization
• Device Addressing
4 Possible Address Settings
Up to 64 Current Sinks
• Integrated Fault Protection
Open Circuit LED(s)
Programmable Short LED Threshold
Over-Temperature Protection
• 9mm x 9mm 64-pin QFN Package with 0.5mm pitch
or 14mm x 14mm 64-pin Low Profile QFP Package
with 0.8mm pitch
Applications
• Large Size LCD TVs, Panels
• White LED Backlight, Dynamic Edge LCD TV Backlight


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