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AAT2400 데이터시트 PDF




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부품번호 AAT2400 기능
기능 Sixteen-Channel White LED Driver Solution
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AAT2400 데이터시트, 핀배열, 회로
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




AAT2400 pdf, 반도체, 판매, 대치품
AAT2401 Pin Descriptions
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14, 32
15
16
17
18
19
20, 22, 24,
25, 26, 27
21
23
28
29
30
31
33
34
35
36
EP
Symbol
CS5
CS6
CS7
CS8
SGND
CS4
CS3
CS2
CS1
RSET
EN
FAULT
PLL
AGND
DGND
VIN
VCC
VCCIO
SDO
AGND
CSFBO
CSFBI
ADDR1
ADDR0
VSYNC
GSCLK
SCLK
SDI
CSB
OVP
Function
O
O
O
O
GND
O
O
O
O
I
I
O
I/O
GND
GND
I
I/O
I/O
O
Description
Output current sink 51.
Output current sink 61.
Output current sink 71.
Output current sink 81.
Current sink ground. Connect to GND as closely as possible to the device.
Output current sink 41.
Output current sink 31.
Output current sink 21.
Output current sink 11.
Resistor for setting maximum current sink DC level. Connect a resistor between this pin
and AGND pin.
Logic high enable pin. Apply a logic high voltage after power is applied to the VIN. Or con-
nect to VIN through a RC time delay network to enable the device.
Open drain fault signal. Pull up to logic supply with external resistor.
PLL compensation. Connect associated network between this pin and AGND.
Analog ground. Connect to GND with one single connection.
Digital ground. Connect to GND as closely as possible to the device.
IC and boost converter power supply.
Internally regulated power supply. Decouple with 2.2µF/6.3V capacitor to AGND.
Internally regulated power supply (3.3V) for SDO. Decouple with 2.2µF/6.3V capacitor to
DGND.
SPI interface serial data output.
GND
Connect to GND with one single connection.
O
Current sink feedback output. Connect to master device CSFB with a 10kΩ pull-down
resistor
I Current sense feedback input. Connect to VCC if not used.
I MSB device address. Connect to VCC, GND, SDI or leave unconnected to set address.
I LSB device address. Connect to VCC, GND, SDI or leave unconnected to set address.
I Vertical sync. PWM operation synchronization and reset.
I PWM clock. Apply clock or connect to GND if not used.
I SPI interface serial clock.
I SPI interface serial data input.
I SPI interface active low chip select.
I Over-voltage protection pin. Connect resistive divider between VOUT and GND.
Exposed paddle. Connect to PCB GND plane. PCB paddle heat sinking should maintain ac-
ceptable junction temperature.
1. Unused current sink channels must be terminated. Refer to the Channel Disable paragraph in the Application Information section of this datasheet.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
4 202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012

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AAT2400 전자부품, 판매, 대치품
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 = 4.2µH; RSET =10.2kΩ (ICSx = 60mA); TA = -40oC to 85oC unless
otherwise noted. Typical values are at TA = 25oC.
Symbol Description
Logic Level Outputs: SDO, FAULT
VCCIO
VCC I/O Voltage Range
VO(H)
Output Logic Level High
VO(L)
Output Logic Level Low
VFAULTLOW
FAULT Logic Output Low
ISINK
FAULT Logic Hi Leakage
Interface: VSYNC, GSCLK
FVSYNC
VSYNC Maximum Frequency
FGSCLK
GSCLK Frequency
tSETUP(SU_VS) Minimum VSYNC Setup Time
tHOLD(H_VS) Minimum VSYNC Hold Time
TGS(HI/LO_ MIN) Minimum GSCLK Clock High/Low Time
tSCLK(HI/LO_ MIN) Minimum SCLK Clock High/Low Time
tVS(HI/LO_ MIN) Minimum VSYNC Clock High/Low Time
SPI Interface: SDI, SDO, SCLK, CSB
FMAX
Maximum Clock Frequency
tSETUP(SU_ SDI) Minimum SDI Setup Time
tSETUP(SU_CS) Minimum CSB Setup Time
tHOLD(H_ SDI) Minimum SDI Hold Time
Thermal Protection
TJ2(SD)
TJ2(HYS)
TJ1(SD)
TJ1(HYS)
TJ Thermal Shutdown Threshold
TJ Thermal Shutdown Hysteresis
TJ Thermal Warning Threshold
TJ Thermal Warning Hysteresis
Conditions
No Load
ISOURCE = 4mA, VCCIO = 3.3V
ISINK = -4mA
VFAULT = 5.5V
GSCLK, VSYNC
GSCLK, VSYNC
SDI, SCLK
CSB, SDI
SDI, SCLK
Reset Thermal Threshold
CTL1 and CTL2 Registers are Reset to 0
Warning Thermal Threshold
Min
2.97
2.4
55
Typ
3.3
1
24
24
32
32
32
30
24
24
24
140
15
120
15
Max
3.63
0.4
0.4
1
250
Units
V
V
V
V
µA
Hz
MHz
ns
ns
ns
ns
ns
MHz
ns
ns
ns
°C
°C
°C
°C
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
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Sixteen-Channel White LED Driver Solution

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