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AAT2404 Datasheet PDF - Skyworks Solutions

Part Number AAT2404
Description Voltage-Variable Current Sourcing Boost Controller
Manufacturers Skyworks Solutions 
Logo Skyworks Solutions Logo 

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AAT2404 datasheet, circuit
DATA SHEET
AAT2404
Voltage-Variable Current Sourcing Boost Controller For LED Lighting Applications
General Description
The AAT2404 is a highly integrated high-efficiency vari-
able voltage current sourcing boost controller for white
LED backlight applications intended for use in large size
LCD panels and LCD TVs. To accommodate various LED
backlighting configurations in both direct and edge light-
ing applications, the device uses a high voltage external
power MOSFET. The AAT2404 contains an integrated cur-
rent sense architecture eliminating the need for an
expensive low resistance/high accuracy sense resistor.
The device operates ideally from a regulated 12V or 24V
DC power supply, but can also operate over a 10.8V to
28V range.
The AAT2404 provides an output voltage up to 100V
regulated by the CSFB pin provided by the ICs in
Skyworks' family of white LED drivers for TV applications.
The CSFB pin is an analog voltage representing the LED
string with the highest voltage requirement. Regulating to
this voltage allows for a wide range of LED characteristics,
while maintaining the lowest possible power dissipation.
The CSFB regulation point can be set by adjusting a resis-
tor to ground from the RSET pin.
The boost switching frequency is nominally 400kHz to
allow for optimum efficiency with the smallest external
filter. However, the device switching frequency may be
adjusted with an external resistor to optimize system
performance. Current mode control provides fast response
to line and load transients.
Thermal protection circuitry shuts down the boost con-
verter in the event of an over-temperature condition.
The AAT2404 is available in the Pb-free, thermally
enhanced 24-pin 3 x 4mm TQFN package.
Features
VIN Range: 10.8V – 28.0V
Maximum VLED: 100V
Up to 95% Boost Conversion Efficiency
Integrated Current Sense Eliminates Need for Ballast
Resistors
Switching Frequency Options
400KHz Nominal
Adjustable Range from 100kHz to 800kHz
Adjustable Regulation Voltage
Analog Input from LED Driver
User Adjustable for Fixed Output
Integrated Low Impedance Gate Drive = VCC
Flexible Current Sense Feedback Control
Power OK Output
Integrated Over-Voltage Protection
Soft-Start to Minimize Inrush Current
TQFN34-24 Low Profile Package
-40°C to +85°C Temperature Range
Applications
Large Size LCD TV, Panels
LCD Monitors
Video Walls
White LED Backlighting
Typical Application
VIN = 10.8V to 28V
CIN
CVCC
D1
L1 Q1
VIN GATE LXS OVP
VCC
AAT2404
R1
R2
VLED
COUT
On/Off Enable Input
CC
RC
RFREQ
RSET
EN
COMP
POK
FREQ
RSET
CSFB
PGND AGND
Power OK Output
Current Sense Feedback Input
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202247A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012
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AAT2404 equivalent
DATA SHEET
AAT2404
Voltage-Variable Current Sourcing Boost Controller For LED Lighting Applications
Typical Characteristics
UVLO vs. Temperature
9.8
9.6
9.4
9.2
9.0
8.8
8.6
8.4
8.2
-40
Rising
Falling
-15 10 35 60
Temperature (°C)
85
Quiescent Current vs. Temperature
(VIN = 24V; VEN = VIN; Non-switching)
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
-40
-15
10
35 60
85
Temperature (°C)
Shutdown Current vs. Temperature
(VIN = 24V; VEN = GND)
16
14
12
10
8
6
4
2
0
-40 -15 10 35 60 85
Temperature (°C)
Efficiency vs. Load Current
(VIN = 24V; VLED = 31V; COUT = 20µF; L = 10µH)
100
96
92
88
84
80
76
72
68
0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0
Output Current (A)
Input Logic Threshold vs. Temperature
(VIN = 24V)
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
-40
-15
10
Logic Threshold High
Logic Threshold Low
35 60 85
Temperature (°C)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202247A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012
5

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Information Total 20 Pages
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