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부품번호 AAT2404 기능
기능 Voltage-Variable Current Sourcing Boost Controller
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AAT2404 데이터시트, 핀배열, 회로
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 • [email protected] • www.skyworksinc.com
202247A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012
1




AAT2404 pdf, 반도체, 판매, 대치품
DATA SHEET
AAT2404
Voltage-Variable Current Sourcing Boost Controller For LED Lighting Applications
Electrical Characteristics1
VIN = 24V; CIN = 4.7µF, COUT = 4.7µF; CVCC = 2.2µF; L1 = 10µH; RSET =10.2kΩ; TA = -40°C to 85°C unless otherwise
noted. Typical values are at TA = 25°C.
Symbol Description
Power Supply, Current Sinks
VIN Input Voltage Range
VCC Linear Regulator Output Voltage
VUVLO
Under Voltage Threshold
VLED
IQ
ISD
VOVP
Output Voltage Range
Quiescent Current
VIN Pin Shutdown Current
Over-Voltage Threshold
Over-Voltage Hysteresis
RSENSE
ILIMIT
FOSC
TSS
D
Sense Device ON Resistance
Low Side Switch Current Limit
Oscillator Frequency
Soft-Start
Duty Cycle2
Gate Drive
RDS_P
Driver High Side ON Resistance
RDS_N
Driver Low Side ON Resistance
tR Gate Rise Time
tF Gate Fall Time
Logic Level Inputs: EN
VI(L) Input Logic Threshold Low
VI(H)
Input Logic Threshold High
IEN Input Enable Leakage Currrent
Logic Level Outputs: POK
VPOK(LOW) POK Logic Output Low
ISINK
POK Logic High Leakage
Thermal Protection
TJ (SD)
TJ (HYS)
TJ Thermal Shutdown Threshold
TJ Thermal Shutdown Hysteresis
Conditions
0mA < ILOAD < 15mA
VIN Rising
Hysteresis
VIN Falling
VIN = 10.8V to 28.0V
Not switching
EN = Logic Low
VLED Rising
VLED Falling
RFREQ = 10kΩ
VLED = 35V
RFREQ = 10kΩ
VCC = 5V
VCC = 5V
VCC = 5V, CLOAD = 0.5nF
VCC = 5V, CLOAD = 0.5nF
ISINK = -1mA
VPOK = 5.5V
Min Typ Max Units
10.8
28
5.0
10
200
8.5
VIN + 3V
1
10
1.1 1.2 1.3
100
60
10
320 400 480
1.5
80
2
1
10
10
0.4
2.5
2
0.4
1
140
15
V
V
V
mV
V
V
mA
µA
V
mV
mΩ
A
kHz
ms
%
ns
ns
V
V
µA
V
µA
°C
1. The AAT2404 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correla-
tion with statistical process controls.
2. The boosted output voltage, VLED, cannot exceed 100V.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
4 202247A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012

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AAT2404 전자부품, 판매, 대치품
DATA SHEET
AAT2404
Voltage-Variable Current Sourcing Boost Controller For LED Lighting Applications
Functional Block Diagram
VIN
VCC
EN
COMP
FREQ
RSET
CSFB
Linear
Regulator
Logic
and PWM
Control
I-Precise™
OVP
GATE
LXS
POK
AGND
PGND
Functional Description
The AAT2404 is a high voltage DC-DC boost converter
that functions as a voltage variable current source that is
designed to complement Skyworks' family of white LED
drivers for TV applications
Operating from a 10.8V to 28V input supply range, the
AAT2404 can supply a compliance voltage up to 100V
with the output power limited only by the size and selec-
tion of the external switching MOSFET, inductor and
schottky diode. Input voltage sources common to LCD
monitors and TV display panels are 12V or 24V with a
maximum effective switching duty cycle of 80%.
The AAT2404 uses a unique internal current scheme, and
relies on a current sense feedback loop (CSFB) integrated
into the AAT2401/02S/03 LED driver ICs which eliminates
the need for low resistance, 1% tolerance current sense
resistors for each LED backlight string. The CSFB function
is an analog voltage feedback system that represents 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 for the system. The CSFB regulation
voltage point can be set by adjusting an external resistor
to ground from the RSET pin.
The AAT2404 provides a low gate impedance driver to
minimize the switching losses of the external boost power
MOSFET and can attain boost conversion efficiencies up
to 95%. The boost switching frequency is nominally
400kHz to allow for optimum efficiency with the smallest
external filter. Alternatively, the device switching frequen-
cy may be adjusted over a 100kHz to 800kHz range by
an external resistor if required by a specific application.
For reliability and protection of the application system,
the AAT2404 has a thermal protection circuit to shut
down the boost converter in the event of an over-tem-
perature condition. An output over voltage protection
circuit (OVP) constantly monitors the boost output volt-
age and will terminate the boost switching cycle if the
output exceeds a user set threshold.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202247A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 7, 2012
7

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