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AAT2401 Schematic ( PDF Datasheet ) - Skyworks

Teilenummer AAT2401
Beschreibung Sixteen-Channel White LED Driver Solution
Hersteller Skyworks
Logo Skyworks Logo 




Gesamt 30 Seiten
AAT2401 Datasheet, Funktion
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
General Description
The AAT2400/2401 is a highly integrated, high efficiency
white LED backlight solution for large size LCD panels
used in LCD TVs. To accommodate power requirements,
the solution consists of two devices, a master device
(AAT2400) and a slave device (AAT2401). The devices
operate from a regulated 24V DC power supply. The
master device supplies a 40V rail to drive 10 series LEDs
with a typical VF of 3.6V. 16 precision current sinks split
evenly between the master and slave devices provide
constant current drive for up to 160 white LEDs.
A SPI compatible interface operates up to 30MHz, allow-
ing fast, independent digital control of each current sink.
Full scale LED current is programmed from 30mA to
100mA using an external resistor. LED brightness varia-
tion is compensated by setting relative current sink mag-
nitudes with an 8-Bit Dot Correction register for each
LED current sink.
The AAT2400/2401 provides a 12-bit programmable
phase delay per LED current sink that can be used to
synchronize the LEDs to VSYNC. Device addressing pro-
vides for up to 256 LED strings. A 12-bit programmable
Gray Scale PWM brightness setting is generated via a
clock from a PLL synchronized to VSYNC, or from the
external GSCLK pin.
The AAT2400/2401 provides fault handling and fault
reporting through the interface. If LEDs are shorted on
one or more strings, the current sinks will maintain
operation due to the high voltage rating of the outputs.
However, a fault condition will be reported on the open
drain Fault pin. Similarly, if an open circuit is detected or
an over-temperature condition arises, the fault is report-
ed on the Fault pin. When a fault is reported, the nature
of the fault condition can be read through the serial
interface.
The AAT2400 boost converter provides an output voltage
regulated by the string with the highest voltage require-
ment allowing a wide range of LED characteristics, while
maintaining the lowest possible power dissipation. The
boost switching frequency is 600kHz to allow for opti-
mum efficiency with the smallest external filter.
Alternatively, the device may be synchronized to an
external clock. Current mode control provides fast
response to line and load transients. Thermal protection
circuitry shuts down the boost converter and the current
sinks in the event of an over-temperature condition.
The AAT2400 and AAT2401 are available in Pb-free, ther-
mally enhanced 36-pin 5x5mm TQFN packages.
Features
VIN Range: 10.8V – 28V
Integrated Boost Converter
VOUT(MAX): 40V
IOUT(MAX): 1.6A
Up to 95% Efficiency
Switching Frequency Options
600 kHz
Sync to External Clock (optional)
16 LED Current Sinks up to 100mA/ch
±2.5% Accuracy (60mA)
±2.0% Matching (60mA)
SPI Interface
Digitally Programmable Individual Channels
Up to 30MHz Clock Speed
Read/Write Registers
Precision PWM Digital Brightness Control
12-bit Individual Gray Scale PWM Brightness
12-bit Individual Channel Phase Delay
8-bit Individual Current Setting (Dot Correction)
VSYNC Derived Internal Oscillator
VSYNC PWM and Delay Synchronization
Device Addressing
16 Possible Address Settings
Up to 256 Current Sinks
Fault Reporting
Integrated Fault Protection
Open/Short LED(s)
Current Limit Protection
Over-Voltage Protection
Over-Temperature Protection
Soft-Start to Minimize Inrush Current
TQFN55-36 Low Profile Package
-40°C to +85°C Temperature Range
Applications
Large Size LCD TV, Panels
White LED Backlight
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
1






AAT2401 Datasheet, Funktion
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Electrical Characteristics1
VIN=24V; CIN = 4.7µF, COUT = 4.7µF; CVCC = 2.2µF; L1 = 10µH; RSET =10.2kΩ (ICSx = 60mA); TA = -40oC to 85oC unless
otherwise noted. Typical values are at TA = 25oC.
Symbol Description
Power Supply, Current Sinks
VIN Input Voltage Range
VUVLO
Under-Voltage Threshold
VOUT
IQ_2400
IQ_2401
ISD
IEN_LEAKAGE
IADDR0, IADDR1
VOVP
RDS(ON)LO
ILIMIT
FOSC
FSYNC
TSS
ICSx / IRSET
Output Voltage Range
Quiescent Current of AAT2400 (no
switching)
Quiescent Current of AAT2401
VIN Pin Shutdown Current
Enable Leakage Current
Input Current to ADDR0 and ADDR1
Over-Voltage Threshold
Over-Voltage Hysteresis
Low Side Switch On-Resistance
Low Side Switch Current Limit
Oscillator Frequency
Sync Frequency
Soft-Start
Current Set Ratio
VCx
ICSx
ICSx-Matching
Current Sink Voltage
Current Sink Accuracy
Current Matching Between Any Sink
Channel
Conditions
Min Typ Max Units
VIN Rising
Hysteresis
VIN Falling
VIN = 10.8 to 28.0V
ICSx = 0mA, VCSx = 1V
ICSx = 0mA, VCSx = 1V
CSn = IN, EN = Logic Low; includes CSx
+ LX leakage current
EN = 5V
ADDR0 = 5V, ADDR1 = 5V
VOUT Rising
VOUT Falling
VOUT = 35V
ICSx/IRSET, VRSET = 0.6V nom, Full Scale Dot
Correction
EN = Logic High, ICSx = 60mA (RSET =
10.2kΩ)
ICSx = 60mA
ICSx= 60mA
10.8
8.5
VIN + 3V
1.1
4.5
500
300
-2.5
-2
500
3
5
25
1.2
100
180
600
1
1024
0.8
28.0
10
40
5
100
1.3
6.5
700
900
+2.5
+2
V
V
mV
V
V
mA
mA
µA
µA
µA
V
mV
mΩ
A
kHz
kHz
ms
A/A
V
%
%
VCx(SHORT)
Shorted Diode(s) Detection Threshold ICSx= 60mA
Logic Level Inputs: EN, SYNC, VSYNC, GSCLK, SDI, SCLK, CSB
VI(L)
VI(H)
Input Logic Threshold Low
Input Logic Threshold High
VI(H)_EN
Enable Logic Threshold High
3V
0.4 V
1.4 V
2.5 V
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
6 202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012

6 Page









AAT2401 pdf, datenblatt
AAT2401 (slave)
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
FAULT
VIN
VCCIO
VCC
EN
OVP
SCLK
SDI
CSB
SDO
ADDR0
ADDR1
Linear
Regulator
Temperature Detect
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8
CSFBO
CSFBI
CS16
CS15
CS14
CS13
CS12
CS11
CS10
CS9
VSYNC
PLL
GSCLK
RSET
4096 x PLL
Mux
DGND AGND
SGND
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
12 202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012

12 Page





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