Skyworks AAT2400 Sixteen-channel white led driver solution Datasheet

DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
General Description
Features
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.
• 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
A SPI compatible interface operates up to 30MHz, allowing fast, independent digital control of each current sink.
Full scale LED current is programmed from 30mA to
100mA using an external resistor. LED brightness variation is compensated by setting relative current sink magnitudes 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 provides 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 reported 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 requirement allowing a wide range of LED characteristics, while
maintaining the lowest possible power dissipation. The
boost switching frequency is 600kHz to allow for optimum 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.
Applications
• Large Size LCD TV, Panels
• White LED Backlight
The AAT2400 and AAT2401 are available in Pb-free, thermally enhanced 36-pin 5x5mm TQFN packages.
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
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Typical Application Circuit
L1
10µH
VIN 24V
D1
60V 3A
LX
EN
VIN
VCC
VCCIO
2.2µF
2.2µF
4.7µF
AAT2400
CS1
CS2
CS3
CS4
CS5
CS6
CS7
CS8
RSET
0.68µF
10µF
2k
R1
OVP
12.1K
18nF
12.1K
4.7µF
50V
442K
SYNC
SCLK
SDI
CS
SDO
ADDR0
ADDR1
VSYNC
GSCLK
PLL
CSFB
COMP
SPI
VOUT
VCC
2K
FAULT
PGND AGND SGND DGND
VIN 24V
EN
VIN
VCC
VCCIO
2.2µF
2.2µF
4.7µF
OVP
SCLK
SDI
CS
SDO
ADDR0
ADDR1
VSYNC
GSCLK
CSFBI
SPI
PLL
12.1K
10µF
2
0.68µF
AAT2401
RSET
R7
CS9
CS10
CS11
CS12
CS13
CS14
CS15
CS16
VCC
2K
FAULT
CSFBO
PGND AGND SGND DGND
10K
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
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
AAT2400 Pin Descriptions
Pin #
Symbol
Function
1
2
3
4
5
6
7
8
9
CS5
CS6
CS7
CS8
SGND
CS4
CS3
CS2
CS1
O
O
O
O
GND
O
O
O
O
10
RSET
I
11
EN
I
12
13
14, 32
15
16
17
FAULT
PLL
AGND
DGND
VIN
VCC
O
I/O
GND
GND
I
I/O
18
VCCIO
I/O
19
20
21
22
23
SDO
COMP
CSFB
SYNC
N/C
O
I
I
I
24, 25
LX
O
26, 27
PGND
GND
28
29
30
31
33
34
35
36
ADDR1
ADDR0
VSYNC
GSCLK
SCLK
SDI
CSB
OVP
I
I
I
I
I
I
I
I
EP
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 VIN or connect 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.
Boost converter compensation. Connect external resistor and capacitor to this pin and AGND.
Current sink feedback. Connect to slave device CSFBO with a 10kΩ pull-down resistor.
Connect to an external clock for synchronization Connect to PGND if not used.
No connect
Switching node of boost converter. Connect a 10µH inductor between this pin and VIN. Connect
a Schottky diode between this pin and the boost output capacitor.
Power ground of boost converter integrated NMOS switching device. Boost output capacitor
must be placed very close to this pin.
MSB device address. Connect to VCC, GND, SDI or leave unconnected to set address.
LSB device address. Connect to VCC, GND, SDI or leave unconnected to set address.
Vertical sync. PWM operation synchronization and reset.
PWM clock. Apply clock or connect to GND if not used.
SPI interface serial clock.
SPI interface serial data input.
SPI interface active low chip select.
Over-voltage protection pin. Connect resistive divider between VOUT and GND.
Exposed paddle. Connect to PCB GND plane. PCB paddle heat sinking should maintain acceptable 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
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
3
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
AAT2401 Pin Descriptions
Pin #
Symbol
Function
1
2
3
4
5
6
7
8
9
CS5
CS6
CS7
CS8
SGND
CS4
CS3
CS2
CS1
O
O
O
O
GND
O
O
O
O
10
RSET
I
11
EN
I
12
13
14, 32
15
16
17
FAULT
PLL
AGND
DGND
VIN
VCC
O
I/O
GND
GND
I
I/O
18
VCCIO
I/O
19
20, 22, 24,
25, 26, 27
SDO
O
AGND
GND
21
CSFBO
O
23
28
29
30
31
33
34
35
36
CSFBI
ADDR1
ADDR0
VSYNC
GSCLK
SCLK
SDI
CSB
OVP
I
I
I
I
I
I
I
I
I
EP
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 connect 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.
Connect to GND with one single connection.
Current sink feedback output. Connect to master device CSFB with a 10kΩ pull-down
resistor
Current sense feedback input. Connect to VCC if not used.
MSB device address. Connect to VCC, GND, SDI or leave unconnected to set address.
LSB device address. Connect to VCC, GND, SDI or leave unconnected to set address.
Vertical sync. PWM operation synchronization and reset.
PWM clock. Apply clock or connect to GND if not used.
SPI interface serial clock.
SPI interface serial data input.
SPI interface active low chip select.
Over-voltage protection pin. Connect resistive divider between VOUT and GND.
Exposed paddle. Connect to PCB GND plane. PCB paddle heat sinking should maintain acceptable junction temperature.
1. Unused current sink channels must be terminated. Refer to the Channel Disable paragraph in the Application Information section of this datasheet.
4
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
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Pin Configuration
AAT2400
TQFN55-36
(Top View)
AAT2401
TQFN55-36
(Top View)
CS5
CS6
CS7
CS8
SGND
CS4
CS3
CS2
CS1
35
34
33
32
31
30
29
ADDR1
ADDR0
VSYNC
GSCLK
AGND
SCLK
SDI
CSB
OVP
ADDR1
ADDR0
VSYNC
GSCLK
AGND
SCLK
SDI
CSB
OVP
36
28
36
1
27
2
26
3
25
4
24
5
23
6
22
7
21
8
20
9
19
10
11
12
13
14
15
16
17
PGND
PGND
LX
LX
N/C
SYNC
CSFB
COMP
SDO
18
CS5
CS6
CS7
CS8
SGND
CS4
CS3
CS2
CS1
35
34
33
32
31
30
29
28
1
27
2
26
3
25
4
24
5
23
6
22
7
21
8
20
9
19
10
11
12
13
14
15
16
17
AGND
AGND
AGND
AGND
CSFB1
AGND
CSFBO
AGND
SDO
18
VCCIO
VCC
VIN
DGND
AGND
PLL
FAULT
EN
RSET
VCCIO
VCC
VIN
DGND
AGND
PLL
FAULT
EN
RSET
Absolute Maximum Ratings1
TA = 25OC unless otherwise noted.
Symbol
Description
VLX
VIN,EN
VCSx
VCC
OVP, COMP, SYNC, VSYNC, GSCLK, RSET,
SDI, SDO, SCLK, CS B, PLL, FLAUT,
CSFB, CSFBi, CSFBo, ADDR0, ADDR1
IOUT
TJ
TLEAD
LX Voltage to GND
Input Voltage, EN to GND
Output current sinks CS1 – CS16 to GND
Low Voltage Pin to GND
OVP, COMP, SYNC, VSYNC, GSCLK, RSET, SDI, SDO,
SCLK, CS B, PLL, FLAUT, CSFB, CSFBi, CSFBo, ADDR0,
ADDR1 Voltage to GND
Maximum DC Output Current2
Maximum Junction Operating temperature
Maximum Soldering Temperature (at leads, 10 sec)
Value
Units
45
-0.3 to 30
-0.3 to 35
-0.3 to 6.0
V
-0.3 to V CC + 0.3
1800
-40 to +150
300
mA
Value
Units
°C
Thermal Information3
Symbol
ΘJA
PD
Description
Thermal Resistance
Maximum Power Dissipation
4
23
4.3
O
C/W
W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Based on long-term current density limitation.
3. Mounted on an FR4 board.
4. Derate 23mW/°C above 25°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
5
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
Conditions
Power Supply, Current Sinks
VIN
Input Voltage Range
VUVLO
VOUT
IQ_2400
IQ_2401
ISD
IEN_LEAKAGE
IADDR0, IADDR1
VOVP
RDS(ON)LO
ILIMIT
FOSC
FSYNC
TSS
ICSx / IRSET
Under-Voltage Threshold
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
Current Sink Voltage
ICSx
Current Sink Accuracy
Current Matching Between Any Sink
Channel
ICSx-Matching
VCx(SHORT)
Shorted Diode(s) Detection Threshold
Typ
10.8
VIN Rising
Hysteresis
VIN Falling
VIN = 10.8 to 28.0V
Max
Units
28.0
10
V
V
mV
V
V
500
8.5
VIN + 3V
40
ICSx = 0mA, VCSx = 1V
3
mA
ICSx = 0mA, VCSx = 1V
CSn = IN, EN = Logic Low; includes CSx
+ LX leakage current
EN = 5V
ADDR0 = 5V, ADDR1 = 5V
VOUT Rising
VOUT Falling
5
mA
25
µA
1.1
4.5
500
300
VOUT = 35V
ICSx/IRSET, VRSET = 0.6V nom, Full Scale Dot
Correction
EN = Logic High, ICSx = 60mA (RSET =
10.2kΩ)
ICSx = 60mA
ICSx= 60mA
1
µA
µA
V
mV
mΩ
A
kHz
kHz
ms
1024
A/A
0.8
V
1.2
100
180
600
5
100
1.3
6.5
700
900
-2.5
+2.5
%
-2
+2
%
0.4
V
V
V
ICSx= 60mA
Logic Level Inputs: EN, SYNC, VSYNC, GSCLK, SDI, SCLK, CSB
VI(L)
Input Logic Threshold Low
VI(H)
Input Logic Threshold High
VI(H)_EN
Enable Logic Threshold High
6
Min
3V
1.4
2.5
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
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)
TJ Thermal Shutdown Threshold
TJ2(HYS)
TJ Thermal Shutdown Hysteresis
TJ1(SD)
TJ Thermal Warning Threshold
TJ1(HYS)
TJ Thermal Warning Hysteresis
Conditions
No Load
ISOURCE = 4mA, VCCIO = 3.3V
ISINK = -4mA
Min
Typ
Max
Units
2.97
2.4
3.3
3.63
V
V
V
V
µA
0.4
0.4
1
VFAULT = 5.5V
55
GSCLK, VSYNC
GSCLK, VSYNC
SDI, SCLK
CSB, SDI
SDI, SCLK
Reset Thermal Threshold
CTL1 and CTL2 Registers are Reset to 0
Warning Thermal Threshold
1
24
24
32
32
32
250
Hz
MHz
ns
ns
ns
ns
ns
30
24
24
24
MHz
ns
ns
ns
140
15
120
15
°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
7
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
SPI Timing Diagram
CSB
SCLK
SDI / SDO
tSETUP(SU-CS)
8
tSETUP(SU-SDI)
t HOLD(H-SDI)
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
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Typical Characteristics
AAT2400 Boost Converter Efficiency
vs. Output Current
LED Current vs. Input Voltage
(60mA/ch)
(VOUT = 38V)
60.20
60.15
VIN = 26V
VIN = 24V
VIN = 22V
96
94
LED Current (mA)
Efficiency (%)
98
92
90
88
60.05
60.00
59.95
59.90
59.85
59.80
86
0.0
60.10
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
21.6
22.4
Output Current (A)
Shutdown Current (µA)
Quiescent Current (mA)
8
7
6
5
4
3
2
1
-15
10
35
60
20
15
10
5
-15
35
60
85
AAT2400 Boost Converter Low Side
On-Resistance vs. Temperature
63
62
61
60
59
58
57
56
60
85
Low Side On Resistance (mΩ)
Output Current (mA)
10
Temperature (°C)
64
Temperature (°C)
28.0
25
0
-40
85
65
35
27.2
30
(60mA/ch)
10
26.4
35
Output Current Matching vs. Temperature
-15
25.6
(VIN = 24V)
40
Temperature (°C)
55
-40
24.8
Sum of AAT2400 and AAT2401
Shutdown Current vs. Temperature
(VIN = 24V)
0
-40
24.0
Input Voltage (V)
Sum of AAT2400 and AAT2401
Quiescent Current vs. Temperature
9
23.2
350
300
250
200
150
100
50
0
-40
-15
10
35
60
85
Temperature (°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
9
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Typical Characteristics
Switching Frequency (kHz)
Switching Frequency vs. Temperature
Turn On
(VIN = 24V; 50mA/ch)
640
630
SDI
(2V/div)
620
610
VOUT
(10V/div)
VSINK
(5V/div)
600
590
580
IOUT
(500mA/div)
570
560
-40
-15
10
35
60
0V
24V
800mV
0mA
85
Temperature (°C)
Time (1ms/div)
UVLO Falling vs. Temperature
Turn Off
(VIN = 24V; 50mA/ch)
10.0
VOUT
(10V/div)
VSINK
(10V/div)
IOUT
(500mA/div)
9.8
UVLO Falling (V)
SDI
(2V/div)
0V
34V
800mV
9.6
9.4
9.2
9.0
8.8
8.6
0mA
8.4
-40
-15
Time (1ms/div)
UVLO Rising vs. Temperature
60
85
(VIN = 12V)
3.60
9.8
85°C
25°C
-40°C
3.50
9.6
9.4
VCCIO (V)
UVLO Rising (V)
35
VCCIO vs. IVCCIO
10.0
9.2
9.0
3.40
3.30
3.20
8.8
3.10
8.6
8.4
-40
-15
10
35
Temperature (°C)
10
10
Temperature (°C)
60
85
3.00
0
10
20
30
40
ICC (mA)
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
50
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Functional Block Diagram
AAT2400 (master)
LX
VIN
FAULT
Linear
Regulator
VCCIO
VCC
PWM
Logic
PGND
Temperature Detect
ADDR0
ADDR1
7-bit
Dot Correction
Fault
Condition
Reporting
SPI
Interface
SCLK
SDI
CSB
SDO
16
7-bitDot
DotCorrection
Correction
7-bit
7-bit
DotCorrection
Correction
7-bit
Dot
7-bit
Dot
Correction
7-bitDot
DotCorrection
Correction
7-bit
8-bit
Dot Correction
7-bitDot
DotCorrection
Correction
7-bit
7-bit
DotCorrection
Correction
7-bit
Dot
7-bit
Dot
Correction
7-bit
Dot
Correction
7-bit
Correction
12-bitDot
Delay
Time
7-bitDot
DotCorrection
Correction
7-bit
7-bit
DotCorrection
Correction
7-bit
Dot
7-bit
Dot
Correction
7-bit
Dot
Correction
7-bitGray
Dot Scale
Correction
12-bit
PWM
VSYNC
PLL
GSCLK
CS8
CS7
CS6
CS5
CS4
CS3
CS2
CS1
Vfb
Fault Detect
EN
OVP
COMP
SYNC
CSFB
8x31
Control
Control
Control
Control
Control
Control
Control
Control
8
4096 x PLL
Mux
RSET
DGND
AGND
SGND
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11
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
AAT2401 (slave)
FAULT
VIN
CSFBO
CSFB
Linear
Regulator
VCCIO
VCC
Vfb
Fault Detect
EN
OVP
Temperature Detect
ADDR0
ADDR1
7-bit
Dot Correction
Fault
Condition
Reporting
SPI
Interface
SCLK
SDI
CSB
SDO
16
7-bitDot
DotCorrection
Correction
7-bit
7-bit
DotCorrection
Correction
7-bit
Dot
7-bit
Dot
Correction
7-bit
Dot
Correction
7-bitDot
DotCorrection
Correction
8-bit
7-bitDot
DotCorrection
Correction
7-bit
7-bit
DotCorrection
Correction
7-bit
Dot
7-bit
Dot
Correction
7-bit
Dot
Correction
7-bit
Correction
12-bitDot
Delay
Time
7-bitDot
DotCorrection
Correction
7-bit
7-bit
DotCorrection
Correction
7-bit
Dot
7-bit
Dot
Correction
7-bitDot
DotCorrection
Correction
7-bit
12-bit
Gray Scale
PWM
VSYNC
PLL
GSCLK
CSFBI
CS16
CS15
CS14
CS13
CS12
CS11
CS10
CS9
8x31
Control
Control
Control
Control
Control
Control
Control
Control
8
4096 x PLL
Mux
RSET
DGND
12
AGND
SGND
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
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Functional Description
Soft Start / Enable
The AAT2400 consists of a high efficiency DC/DC boost
controller, an integrated slew rate controlled input disconnect MOSFET switch, and a MOSFET power switch. A
high voltage rectifier, power inductor, output capacitor,
feedback compensation network, and OVP resistor divider network are required to implement a DC/DC boost
converter.
The input disconnect switch is activated when a valid
supply voltage is present and the EN/SET pin is strobed
high. Slew rate control on the input disconnect switch
ensures minimal inrush current as the output voltage is
charged to the input voltage, prior to switching of the
N-channel power MOSFET. A monotonic turn-on is guaranteed by the built-in soft-start circuitry, which eliminates output current overshoot across the full input voltage range and over all load conditions.
The AAT2400’s boost controller is designed to deliver
1600mA up to 40V. It can drive a total of 16 current
regulated sinks (8 from its own and 8 from AAT2401) with
10 HB white LEDs connected in series at each channel.
The maximum LED sink current can be set by an external resistor. Each current sink can be programmed
through the SPI interface. Each sink allows independent
control with different registers (DOT correction, Gray
Scale, Delay, On/Off control configuration).
AAT2400 and AAT2401 both provide one linear regulator
for VCCIO supply.
Control Loop
The AAT2400 provides the benefits of current mode control with a simple feedback loop. The device maintains
exceptional DC regulation, transient response, and cycleby-cycle current limit with additional RC compensation
components. The AAT2400 modulates the power MOSFET
switching current in response to changes in output voltage (LED voltage). This allows the voltage loop to directly
program the required inductor current in response to
changes in the output load. The switching cycle initiates
when the N-channel MOSFET is turned ON and current
ramps up in the inductor. The ON interval is terminated
when the feedback signal crossover the falling edge of the
saw wave from the PWM modulator. During the OFF interval, the inductor discharges the energy (inductor ramps
down) until the lower threshold, or zero inductor current,
is reached. The lower current is equal to the peak current
minus a preset hysteresis threshold which determines the
inductor ripple current. The peak current is adjusted by
the controller until the output current requirement is met.
The magnitude of the feedback error signal determines
the average input current. Therefore, the AAT2400 controller implements a programmed current source connected to the output capacitor and load resistor. There is
no right-half plane zero, and loop stability is achieved with
simple RC compensation components.
Current Limit and
Over-Temperature Protection
The switching of the N-channel MOSFET terminates when
a current limit of 6.5A (max) is exceeded. This minimizes
power dissipation and component stresses under overload and short-circuit conditions. Switching resumes
when the current decays below the current limit. Thermal
protection disables the AAT2400/AAT2401 when the
internal power dissipation causes the junction temperature to reach the thermal limit threshold (140°C, nominal). When the thermal threshold is reached, the control
register, CTL1 or CTL2, is reset to 00h and all current
sinks are disabled. When the AAT2400's thermal threshold is reached, the boost converter is also disabled.
Over-Voltage Protection
Over-voltage protection prevents damage to the AAT2400
during open-circuit on any LED channel sinks causing
high output voltage conditions. An over-voltage event is
defined as a condition where the voltage on the OVP pin
exceeds the over-voltage threshold limit (VOVP = 1.2V
typical). When the voltage on the OVP pin has reached
the threshold limit, the converter stops switching and
the output voltage decays. Switching resumes when the
voltage on the OVP pin drops below the lower hysteresis
limit, maintaining an average output voltage between
the upper and lower OVP thresholds multiplied by the
resistor divider scaling factor.
Under-Voltage Lockout
Internal bias of all circuits is controlled via the VIN input.
Under-voltage lockout (UVLO) guarantees sufficient VIN
bias and proper operation of all internal circuitry prior to
soft start.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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13
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Current Sink Control
Each current sink has an independent property programmed by the following registers. The AAT2400 contains current sinks 1 through 8. The AAT2401 contains
current sinks 9 through 16.
and a 4-bit word. This register has a default setting of 0.
Only even register addresses are used. Starting from 80h,
every other even register is programmed up to BEh.
ADDR:
80h to BEh
Dot Correction
Bit
Each current sink can have a separate current setting to
compensate for relative LED brightness. This register
has a default setting of half scale.
7:0
ADDR:
00h to 1Eh
DOTn:
DOT Correction Current Setting
Bit
Bit Name
Default
Access
Description
7:0
DOTn 7:0
7Fh
R/W
8-bit DOT word
Table 1: DOT Correction Current Setting.
ADDR:
40h to 7Eh
Bit Name
GSn 7:0
ADDR:
40h to 7Eh
3:0
Default
00h
Access
Description
R/W
8 LSBs of 12-bit
GS word
00h
ADDR:
80h to BEh
Access
Description
R/W
8 LSBs of 12-bit
GS word
DLYn MSB:
Delay Setting MSB
Bit
Bit Name
Default
Access
Description
3:0
DLYn 11:8
00h
R/W
4 MSBs of 12bit GS word
Current Sink ON/OFF
Each current sink can be independently enabled or disabled. In the event of an over temperature condition,
this register is reset to 00h and must be reprogrammed
to resume operation. It has a default setting of 00h (all
sinks are off).
Bit Name
GSn 11:8
Default
04h
Access
Description
R/W
4 MSBs of 12-bit
GS word
Bit
Bit Name
Default
Access
Description
7:0
CS8:CS1
00h
R/W
0 = current
sink OFF, 1=
current sink ON
Table 6: CTL1 Setting.
Each current sink has a unique delay time from the start
of VSYNC to when the current sink PWM cycle begins. The
delay register is a 12-bit word divided into an 8-bit word
CTL2:
This Register Enables or
Disables Each Current Sink
Independently
ADDR: C2h
Bit
Delay
CTL1:
This Register Enables or
Disables Each Current Sink
Independently
ADDR: C0h
GSn MSB:
Gray Scale Setting MSB
Table 3: Gray Scale Setting MSB.
14
DLYn 7:0
GSn LSB:
Gray Scale Setting LSB
Table 2: Gray Scale Setting LSB.
Bit
Default
Table 5: Delay Setting MSB.
Each current sink has a unique PWM duty cycle setting to
provide a given brightness. The gray scale register is a
12-bit word divided into an 8-bit word and a 4-bit word.
This register has a default setting of ½ scale, or 0400h.
Only even register addresses are used starting from 40h
to 7Eh.
7:0
Bit Name
Table 4: Delay Setting LSB.
Gray Scale
Bit
DLYn LSB:
Delay Setting LSB
7:0
Bit Name
CS16:CS9
Default
00h
Access
Description
R/W
0 = current sink
OFF, 1= current
sink ON
Table 7: CTL2 Setting.
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
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
PWM Timing
The PWM “on time” of a given current sink is set by the
gray scale and delay registers according to the following
timing diagram. TVSYNC is the period of the VSYNC signal,
typically 1/120 Hz, or 8 1/3 ms, but TVSYNC can be as short
as 500µs. GSCLK is either derived from VSYNC, where FGSCLK
= 4096 x FVSYNC, or supplied by an external signal at the
GSCLK pin. TDLY is the number between 0 and 4095 of the
DLY register, and is the number of GSCLK rising edges
between the rising edge of VSYNC and the rising edge of the
PWM signal. Likewise, TPWM is the number between 0 and
4095 of the GS register, and is the number of GSCLK
periods of the PWM “on time”. The current sink conducts
during the PWM “on time” (shown high in the following
timing diagram). If TPWM is not met by the end of TVSYNC,
the PWM on time will overflow onto the next TVSYNC period.
LED % Brightness = TPWM /4096 x 100.
Device Address Setup
The device address is set by the two address pins,
ADDR1 and ADDR0. Each address pin has four decode
levels resulting in 16 possible address settings. The
address is programmed by connecting ADDR1 and
ADDR0 to VCC, GND, SDI, or by leaving the ADDR pin
unconnected. The master and slave devices can be programmed with the same device address. The register
addressing will automatically select the appropriate master/slave device for the addressed current sink.
T VSYNC
VSYNC
1
4096
GSCLK
TDLY
TPWM
PWM
Figure 1: PWM Timing Diagram.
Device Address
SPI Address:
Addr1 Addr0 Decoding of Address Set Resistors
Bit
Bit Name
Description
1:0
3:2
ADDR0
ADDR1
00: connect to VCC; 01: OPEN; 10: connect to SDI; 11: connect to GND
00: connect to VCC; 01: OPEN; 10: connect to SDI; 11: connect to GND
Table 8: Device Address Settings.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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15
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Configuration
Bits
ADDR1
ADDR0
6
5
4
3
2
1
0
W
Address (Hex)
VCC
VCC
VCC
VCC
OPEN
OPEN
OPEN
OPEN
SDI
SDI
SDI
SDI
GND
GND
GND
GND
VCC
OPEN
SDI
GND
VCC
OPEN
SDI
GND
VCC
OPEN
SDI
GND
VCC
OPEN
SDI
GND
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
A0
A2
A4
A6
A8
AA
AC
AE
B0
B2
B4
B6
B8
BA
BC
BE
Table 9: Device Address Write Table and Configuration.
Configuration
Bits
ADDR1
ADDR0
6
5
4
3
2
1
0
R
Address (Hex)
VCC
VCC
VCC
VCC
OPEN
OPEN
OPEN
OPEN
SDI
SDI
SDI
SDI
GND
GND
GND
GND
VCC
OPEN
SDI
GND
VCC
OPEN
SDI
GND
VCC
OPEN
SDI
GND
VCC
OPEN
SDI
GND
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
A1
A3
A5
A7
A9
AB
AD
AF
B1
B3
B5
B7
B9
BB
BD
BF
Table 10: Device Address Read Table and Configuration.
16
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
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Fault Reporting
Each device possesses fault reporting registers and a
fault flag. An open or short condition on each current
sink is reported in one of four fault registers. An open
fault condition is only monitored for LED current sink ontimes of greater than 10µs. An over-temperature condition is reported in one of two registers. These conditions
may selectively be reported on the open drain Fault pin.
Bits in separate fault reporting registers can be set or
reset to enable or disable a particular fault condition.
The shorted LED fault condition is handled in a special
way because of the uncertainty associated with shorted
LEDs and the LED forward voltage variation. To detect a
shorted LED fault in the system, all LED channels should
be programmed to be conducting for at least 1ms. The
fault flag will only be valid 1ms after a given LED string
has begun conducting. If the fault flag becomes active,
the fault registers must be read while the channels remain
conducting. The fault reporting register defaults to the
condition of reporting the short detect, so this register
must be cleared prior to checking for shorted LEDs.
Severe LED forward voltage (VF) mismatches between
channels will also be reported as a short fault condition
with the lower VF channels indicating the fault condition.
Fault Registers
ADDR:
E2h
Bit
1:0
3:2
5:4
7:6
Bit
1:0
3:2
5:4
7:6
Bit
Name
CS1
Fault
CS2
Fault
CS3
Fault
CS4
Fault
CS5
Fault
CS6
Fault
CS7
Fault
CS8
Fault
ADDR:
E4h
Bit
1:0
3:2
5:4
7:6
Bit
Name
CS9
Fault
CS10
Fault
CS11
Fault
CS12
Fault
ADDR: E6h
Default
Access
Bit
00h
R
00h
R
00h
R
00h
R
00: no fault, 01:
10: short
00: no fault, 01:
10: short
00: no fault, 01:
10: short
00: no fault, 01:
10: short
Table 11: Fault1 Register Settings.
open,
open,
open,
open,
Access
00h
R
00h
R
00h
R
00h
R
Description
00: no fault, 01:
10: short
00: no fault, 01:
10: short
00: no fault, 01:
10: short
00: no fault, 01:
10: short
open,
open,
open,
open,
Fault3:
This Register Reports Fault
Conditions And High Voltage CS Pins
Default
Access
00h
R
00h
R
00h
R
00h
R
Description
00: no fault, 01:
10: short
00: no fault, 01:
10: short
00: no fault, 01:
10: short
00: no fault, 01:
10: short
open,
open,
open,
open,
Table 13: Fault3 Register Settings.
Fault1:
This Register Reports Fault
Conditions And High Voltage CS Pins
Description
Default
Table 12: Fault2 Register Settings.
The fault registers can be read anytime during operation.
ADDR: E0h
Bit
Name
Fault2:
This Register Reports Fault
Conditions and High Voltage CS Pins
1:0
3:2
5:4
7:6
Bit
Name
CS13
Fault
CS14
Fault
CS15
Fault
CS16
Fault
Fault4:
This Register Reports Fault
Conditions and High Voltage CS Pins
Default
Access
00h
R
00h
R
00h
R
00h
R
Description
00: no fault, 01:
10: short
00: no fault, 01:
10: short
00: no fault, 01:
10: short
00: no fault, 01:
10: short
open,
open,
open,
open,
Table 14: Fault4 Register Settings.
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
17
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Temperature Fault Conditions
Fault Reporting Registers
Two thermal limits are reported in each AAT2400/2401
device. The first thermal limit serves as a warning that
the device is heating up. When this condition is reported,
the system can compensate by lowering the current levels of the current sinks. The second thermal limit is the
maximum temperature allowed. When this temperature
is reached, the control registers are reset to 0 which disables all current sinks. In addition, the boost converter in
the master device is disabled. To resume operation, the
control registers must be reset, and all of the configuration registers must be reprogrammed, since data retention at the maximum temperature is not guaranteed.
Each individual sink’s fault reporting can be configured to
the following cases: LED string becomes open, LED string
becomes short completely, reporting both or report none.
To turn this feature off, set two bits to ‘11’. Setting the
two bits to ‘01’ and ‘10’ means reporting short condition
only or reporting open condition only accordingly. To
report both faulty conditions, set the two bits to ‘00’.
ADDR:
E8h
Bit
Bit Name
Fault Reporting 1:
Individual Sink Fault Reporting
Default
Access
OTMP1:
Reports the Temperature Condition
of the Master IC (CS8 to CS1)
1:0
CS1 Fault
10h
R/W
Description
3:2
CS2 Fault
10h
R/W
00: Tj < T1
01: T1 < Tj < T2
11: T2 < Tj
0: Report T1 and T2
Thermal Limits on
Fault pin
1: Report only T2 Thermal Limit on Fault pin
5:4
CS3 Fault
10h
R/W
7:6
CS4 Fault
10h
R/W
Bit
Bit
Name
Default
Access
1:0
OTMP 1
00h
R
2
Config
0h
R/W
Table 15: OTMP1 Settings.
OTMP2:
Reports the Temperature Condition
of the Slave IC (CS16 to CS9)
ADDR:
EAh
ADDR: F0h
Bit
Bit
Name
Default
Access
1:0
OTMP 2
00h
R
2
Config
0h
R/W
Description
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
Table 17: Fault Reporting Register 1 Settings.
Description
00: Tj < T1
01: T1 < Tj < T2
11: T2 < Tj
0: Report T1 and T2
Thermal Limits on
Fault pin
1: Report only T2 Thermal Limit on Fault pin
Table 16: OTMP2 Settings.
18
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
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Fault Reporting 2:
Individual Sink Fault Reporting
ADDR: F2h
Bit
Bit Name
Default
Access
1:0
CS5 Fault
10h
R/W
3:2
CS6 Fault
10h
R/W
5:4
CS7 Fault
10h
R/W
7:6
CS8 Fault
10h
R/W
Description
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
Table 18: Fault Reporting Register 2 Settings.
Fault Reporting 3:
Individual Sink Fault Reporting
ADDR: F4h
Bit
Bit Name
Default
Access
1:0
CS9 Fault
10h
R/W
3:2
CS10 Fault
10h
R/W
5:4
CS11 Fault
10h
R/W
7:6
CS12 Fault
10h
R/W
Description
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
Table 19: Fault Reporting Register 3 Settings.
ADDR: F6h
Bit
Bit Name
Fault Reporting 4:
Individual Sink Fault Reporting
Default
Access
1:0
CS13 Fault
10h
R/W
3:2
CS14 Fault
10h
R/W
5:4
CS15 Fault
10h
R/W
7:6
CS16 Fault
10h
R/W
Description
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
Table 20: Fault Reporting Register 4 Settings.
Serial Peripheral Interface (SPI)
The serial peripheral interface is a synchronous serial
interface for address and data transfer at bit rates of up
to 30Mhz. It is configured in 8-bit bytes designed to
interface with a standard SPI bus on many microcontrollers. Four pins are used to communicate on the SPI:
SCLK (synchronous clock), CS (chip select, to signify the
start of a transfer), SDI (data input to the AAT2400/2401
for write operations, latched on the rising edge of SCLK),
and SDO (data output from the AAT2400/2401 for read
operations, presented on the falling edge of SCLK).
Data and address are always sent MSB first. The first
8-bit byte of a transfer is always the device address. The
second byte of a transfer is always the address of the
register to be written to or read from. The subsequent
bytes are one or more bytes of data. The LSB (bit 0) of
the device address byte contains a bit that signifies a read
or a write operation. If R/W is 0, one or more write cycles
occur, and if R/W is 1, one or more read cycles occur.
Multi-byte transfers are similar to single byte transfers,
except that the CS pin is held low, and additional SCLK
cycles are sent until the end of the burst. In multi-byte
transfers, the registers are written to or read from in
sequential order. After the end of the address space, the
multi-byte transfer is terminated.
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19
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
SPI Single-Byte Write
CS
SCLK
7-Bit Device Address
“1”
SDI
“0”
“1”
A3
A2
A1
W
A0
“0”
8-Bit Register Address
R7
R6
R5
R4
R3
R2
8-Bit Data written in
R1
R0
R1
R0
D7
D6
D5
D4
D3
D2
D1
D0
High Impedance
SDO
SPI Single-Byte Read
CS
SCLK
7-Bit Device Address
SDI
“1”
“0”
“1”
A3
A2
A1
R
A0
“1”
8-Bit Register Address
R7
R6
R5
R4
R3
R2
High Impedance or don’t care
8-Bit Data read out
High Impedance
SDO
D7
D6
D5
D4
D3
D2
D1
D0
SPI Multi-Byte Write Transfer
CS
SCLK
SDI
Device Addr & W
Register Address
Data Byte n
Data Byte n+1
Data Byte n+m
High Impedance
SDO
SPI Multi-Byte Read Transfer
CS
SCLK
SDI
SDO
20
Device Addr & R
High Impedance
High Impedance or don’t care
Register Address
Data Byte n
Data Byte n+1
Data Byte n+m
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DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Application Information
prevents damage to the device when one of the 16 channels has an open LED circuit. The rest of the channels of
AAT2400 and AAT2401 continue to operate.
Channel Disable
If current sink channels on either the AAT2400 or AAT2401
are not used, they must be terminated. Unused channels
should have their corresponding bit in the CTL1 or CTL2
register set to zero. In applications where the AAT2400/
AAT2401 pair are used, unused channels may be tied to
GND or to VCC. In applications where the AAT2401 is
used alone, unused channels must be tied to VCC.
The resistor divider can be selected such that the overvoltage threshold occurs prior to the output reaching 45V
(VOUT(MAX)). The value of R5 should be selected from 10kΩ
to 20kΩ to minimize switching losses without degrading
noise immunity.
R4 = R5
VOUT(PROTECTION)
-1
VOVP
LED Selection
Although the AAT2400 and 2401 are specifically designed
to drive high current white LEDs, the device can also be
used to drive most types of LEDs with forward voltages
ranging between 2.0V and 4.7V. Since all current sinks
are matched with low voltage dependence, the LED-toLED brightness will be matched regardless of the individual LED forward voltage (VF) levels. It makes the
AAT2400 and 2401 a perfect combination for large LCD
TV backlighting LED applications.
VOUT
AAT2400
R4
C OUT
OVP
R5
AGND
Constant Current Setting
The LED current is controlled by the RSET resistor. For
maximum accuracy, a 1% tolerance resistor is recommended. Table 21 shows the RSET resistor value for
AAT2400 and 2401 for various LED full-scale current
levels.
RSET =
1024(A/A) · 0.6V
ICSx
ICSX (mA)
RSET (kΩ)
40
50
60
70
80
90
100
15.4
12.3
10.2
8.76
7.68
6.81
6.12
Table 21: Maximum LED Current and RSET
Resistor Values (1% Resistor Tolerance).
Over-Voltage Protection
The over-voltage protection circuit consists of a resistor
network connected from the output voltage to the OVP
pin (see Figure 2). This over voltage protection circuit
Figure 2: Over-Voltage Protection Circuit.
If 10 LEDs are connected in series on one channel sink,
the total VF from the WLEDs could be as high as 42V.
Therefore, using R5 = 12.1kΩ and setting VOUT(PROTECTION) =
45V is recommended. Selecting a 1% resistor, this results
in R4 = 442kΩ (rounded to the nearest standard 1%
value). It is always recommended to use the same number of WLEDs on each channel and set the appropriate
over-voltage protection. Failure to do so may cause any
one of the 16 sink pins to exceed the absolute maximum
rating voltage and permanently damage the device in
case the channel is disconnected (open circuit failure).
LED Brightness Control
The AAT2400 and 2401 uses the SPI interface to program
and control LED brightness. Each channel sink current of
the AAT2400 and AAT2401 can be changed successively
to brighten or dim the LED string in smooth transitions
(i.e. dynamic local dimming or zone dimming), giving the
user complete programmability and real-time control of
LED brightness to tune the picture background to a trueblack and a true-white from the LED technology.
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21
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Minimum and Maximum Practical Settings
for Gray Scale and Delay Registers
When using the internally generated PLL derived PWM
timebase, the stability of the frequency on VSYNC defines
the practical minimum and maximum settings for the
gray scale and delay registers. As a rule, the minimum
and maximum settings should be 4 counts away from full
scale. In other words, the register settings should lie
between 04h and 0FFBh. Otherwise, the natural phase
delay between jitter on VSYNC and the internal timebase
may result in unexpected PWM timing. Gray scale set to
zero, however, always results in zero on time.
Selecting the Schottky Diode
To ensure minimum forward voltage drop and no recovery, high voltage Schottky diodes are recommended for
the AAT2400 boost converter. The output diode is selected to maintain acceptable efficiency and reasonable
operating junction temperature under full load operating
conditions. Forward voltage (VF) and package thermal
resistance (θJA) are the dominant factors in selecting a
diode. The diode non-repetitive peak forward surge current rating (IFSM) should be considered for high pulsed
load applications. IFSM rating drops with increasing conduction period.
not conducting. Stored energy is transferred from the
input battery and boost inductor to the output load
through the output diode.
Duty cycle is defined as the ON time divided by the total
switching interval:
D=
tON
= tON · FS
tON + tOFF
The maximum duty cycle can be estimated from the
relationship for a continuous mode boost converter.
Maximum duty cycle (DMAX) is the duty cycle at minimum
input voltage (VIN(MIN)):
DMAX =
VOUT - VIN(MIN)
VOUT
The average diode current during the OFF time can be
estimated:
IAVG(OFF) =
IOUT
1 - DMAX
The VF of the Schottky diode can be estimated from the
average current during the off time. The average diode
current is equal to the output current:
IAVG(TOT) = IOUT
Manufacturers’ datasheets should be reviewed carefully
to verify reliability under peak loading conditions. The
diode’s published current rating may not reflect actual
operating conditions and should be used only as a comparative measure between similarly rated devices.
The average output current multiplied by the forward
diode voltage determines the loss of the output diode:
60V/3A rated Schottky diodes are recommended for output voltages less than 45V (total VF and 100mA/sink
application).
For continuous LED currents, the diode junction temperature can then be estimated:
Estimating Schottky
Diode Power Dissipation
The switching period is divided between ON and OFF
time intervals:
1
= tON + tOFF = D + D′
FS
During the ON time, the N-channel power MOSFET is
conducting and storing energy in the boost inductor.
During the OFF time, the N-channel power MOSFET is
22
PLOSS(DIODE) = IAVG(TOT) · VF = IOUT · VF
TJ(DIODE) = TAMB + θJA · PLOSS(DIODE)
External Schottky diode junction temperature should be
below 110°C, and may vary depending on application
and/or system guidelines. The diode θJA can be minimized with additional metal PCB area on the cathode.
However, adding additional heat-sinking metal around
the anode may degrade EMI performance. The reverse
leakage current of the rectifier must be considered to
maintain low quiescent (input) current and high efficiency under light load. The rectifier reverse current
increases dramatically at elevated temperatures.
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DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Manufacturer
Part Number
Rated Foward
Current (A)
Rated Voltage
(V)
Thermal Resistance,
θJA, (°C/W)
Case
Diode, Inc.
ON Semi
B360A
MBRD360
3A
3A
60
60
100
80
SMA
DPAK
Table 22: Typical Surface Mount Schottky Rectifiers for Various Output Loads
(select TJ < 110°C in Application Circuit).
Selecting the Boost Inductor
The AAT2400 controller utilizes PWM control and the
switching frequency is fixed. To maintain 600kHz switching frequency and stable operation, a 10μH inductor is
recommended. Manufacturer’s specifications list both
the inductor DC current rating, which is a thermal limitation, and peak inductor current rating, which is determined by the saturation characteristics. Measurements
at full load and high ambient temperature should be performed to ensure that the inductor does not saturate or
exhibit excessive temperature rise.
The output inductor (L) is selected to avoid saturation at
minimum input voltage and maximum output load conditions. Worst-case peak current occurs at minimum input
voltage (maximum duty cycle) and maximum load. At
high load the switching frequency is somewhat diminished, resulting in higher IPEAK. Bench measurements are
recommended to confirm actual IPEAK and to ensure that
Manufacturer
Cooper
Bussmann
Cooper
Bussmann
Sumida
Sumida
Sumida
Sumida
TDK
TDK
Würth Elektronik
the inductor does not saturate at maximum LED current
and minimum input supply voltage. The RMS current
flowing through the boost inductor is equal to the DC
plus AC ripple components. Under worst case RMS conditions, the current waveform is critically continuous. The
resulting RMS calculation yields worst case inductor loss.
The RMS current value should be compared against the
inductor manufacturer’s temperature rise, or thermal
degrading, guidelines:
IRMS =
IPEAK
3
For a given inductor type, smaller inductor size leads to
an increase in DCR winding resistance and, in most
cases, increased thermal impedance. Winding resistance
degrades boost converter efficiency and increases the
inductor’s operating temperature:
PLOSS(L) = I2RMS · DCR
Part Number
Inductance
(µH)
Saturated
Rated Current
(A)
DCR
(mΩ)
Size (mm)
LxWxH
Type
DR1040-100-R
10
4.4
26
10.3 x 10.5 x 4.0
Shielded Drum Core
DR1050-100-R
10
4.58
18
10.3 x 10.5 x 5.0
Shielded Drum Core
CDR12D43RNP-100M
CDR10D48MNNP-100MC
CDRH10D43RNP-100NC
CDRH105RNP-100NC
VLF10045T-100M4R3-PF
RLF12545T-100M5R1-PF
WE-PD Type “LS“ - 100
10
10
10
10
10
10
10
6.3
5.5
5.2
4.45
4.3
6
4.2
18
32
26.1
26
25
12.4
25
12.4 x 12.4 x 4.5
10.3 x 10.3 x 5.0
10.5 x 10.8 x 4.5
10.3 x 10.5 x 5.0
9.7 x 10.0 x 4.5
12.8 x 12.5 x 4.7
12 x 12 x 4.5
Shielded
Shielded
Shielded
Shielded
Shielded
Shielded
Shielded
Drum
Drum
Drum
Drum
Drum
Drum
Drum
Core
Core
Core
Core
Core
Core
Core
Table 23: Typical Suggested Surface Mount Inductors.
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23
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
AAT2400/2401 Input Capacitors
In general, it is good design practice to place a decoupling capacitor (input capacitor) between the IN and GND
pins. An input capacitor in the range of 2.2μF to 10μF is
recommended. A larger input capacitor in this application
may be required for stability and transient response.
Multi-layer ceramic (MLC) capacitors provide small size
and adequate capacitance, low parasitic equivalent
series resistance (ESR) and equivalent series inductance
(ESL). MLC capacitors of type X7R or X5R are good to
ensure capacitance stability over the full operating temperature range.
Boost Converter
Output Capacitor Selection
For best performance, a low-ESR aluminum electrolytic
type capacitor is suggested for use with the AAT2400
boost converter output. Other capacitor dielectric types
are compatible and may be used such as Polymer cathode tantalum chip capacitors or low ESR OS-CON (organic semiconductor) capacitors. The voltage rating for a
selected capacitor should exceed the greatest operating
output voltage for the AAT2400 boost converter. Best
engineering practices would recommend a capacitor voltage rating of two times the maximum operating voltage,
although any voltage rating above the maximum operating output voltage of the boost converter is acceptable.
PCB Layout Guidelines
Boost converter performance can be adversely affected
by poor layout. Possible impact includes high input and
output voltage ripple, poor EMI performance, and
reduced operating efficiency. Every attempt should be
made to optimize the layout in order to minimize parasitic PCB effects (stray resistance, capacitance, and
24
inductance) and EMI coupling from the high frequency
LX node. A suggested PCB layout for the AAT2400 boost
converter is shown in Figures 4 and 7. The following PCB
layout guidelines should be considered:
1.
2.
3.
4.
5.
6.
Minimize the distance from Capacitor C1 and C2’s
negative terminals to the PGND pins. This is especially true with output capacitor C2, which conducts
high di/dt current from the output diode back to the
PGND pins.
Minimize the distance between L1 to D1 and switching pin SW; minimize the size of the PCB area connected to the SW pin.
Maintain a ground plane and connect to the IC PGND
pin(s) as well as the PGND connections of CIN and
COUT.
Consider additional PCB metal area on D1’s cathode
to maximize heat sinking capability. This may be
necessary when using a diode with a high VF and/or
thermal resistance.
Consider additional PCB exposed area for the
AAT2400 to maximize heat sinking capability. This
may be necessary when using high output voltage
and high current with minimum input voltage application. Connect the exposed paddle (bottom of the
die) to PGND or GND. Connect AGND, DGND to
SGND as close as possible to the package and maximize the heat sinking space for overall.
To maximize package thermal dissipation and power
handling capacity of the AAT2400 and AAT2401
TQFN55-36 package, solder the exposed paddle of
the IC onto the thermal landing of the PCB, where
the thermal landing is connected to the ground
plane. If heat is still an issue, multi-layer boards
with dedicated ground planes are recommended.
Also, adding more thermal vias on the thermal landing would help transfer heat to the PCB effectively.
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DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Manufacturer
Part Number
Capacitance (μF)
Voltage Rating (V)
Temp Co.
Case Size
Murata
Murata
Taiyo Yuden
Taiyo Yuden
Murata
TDK
Murata
Panasonic
Sanyo
GRM185R60J225KE26
GRM188R71A225KE15
JMK107BJ225KK-T
LMK107BJ225KA-T
GRM31CR61H225KA88L
C3225X7R2A225K
GRM31CR71H475KA12L
EEV-HA1H2R2R
50CE4R7BE
2.2
2.2
2.2
2.2
2.2
2.2
4.7
2.2uF
2.2uF
6.3
10
6.3
10
50
100
50
50V
50V
X5R
X7R
X7R
X7R
X5R
X5R
X5R
Elect SMD
Elect SMD
0603
0603
0603
0603
1206
1210
1206
4x4x5.4
4x4x5.4
Table 24: Typical Suggested Surface Mount Capacitors.
Header1
CS1
CS3
CS5
CS7
OUT
1
3
5
7
9
CS2
CS4
CS6
CS8
OUT
2
4
6
8
10
Header2
CS9
CS11
CS13
CS15
OUT
Header 5X2
1
3
5
7
9
CS10
CS12
CS14
CS16
OUT
2
4
6
8
10
Header 5X2
VIN 24V
LX
L1 10µH
VIN
D1
LX
OUT
C7
4.7µF
50V
60V/3A
VOUT
R4
442k
JP1
1
CS13
CS14
ADDR1
36
35
CSB
34
SDI
33
SCLK
32
31
GSCLK GND
30
VSYNC
29
ADDR0
28
ADDR1
GND
27
26
GND
25
SDO
GND
GND
GND
VCC
CS15
VSYNC
2
SP1
ADDR0
VCCIO
23
1
2
3
4
5
SYNC
VCC
24
GND
SDO
SCLK
SDI
CSB
JP5
VSYNC
GND
ADDR1
ADDR1
SDI
GSCLK
VIN
CSFBI
2
4
DGND
21
1
3
AGND
GND
GND
JP2
1
2
AGND
22
VCC
GND
GND
JP8
SCLK
GND
ADDR0
SDI
PLL
19
2
4
LX
FAULT
20
1
3
C4
18nF
R2
2k
ADDR0
SDI
OVP
CSB
SDO
VCC
GND
JP3
C10
2.2µF
U2
TQFN55-36
AAT2401
EN
GND
PGND 27
LX 25
PGND 26
LX 24
NC 23
CSFB 21
SYNC 22
SDO 19
COMP 20
1
2
17
18
C9
2.2µF
GSCLK
SD0
JP7
VCC1
3
ADDR1
16
CS16
28
C8
4.7µF
50V
VIN
SGND
ADDR1
ADDR0
15
GND
4
VCCIO
29
VIN
14
5
ADDR0
VSYNC
13
C11
0.68µF
RSET
CSFBO
VCC
GSCLK GND
30
12
CS12
VSYNC
11
CS11
GSCLK
VIN
C12
10µF
10
6
DGND
32
31
EN
7
AGND
SCLK
GND
R9 2k
R8 12.1k
CS9
AGND
33
SDI
D3
Red LED
R5
12.1k
CS10
SCLK
CSB
8
CS5
CS6
34
SDI
PLL
GND
35
CSB
FAULT
C3
2.2µF
36
OVP
EN
R7
6.04k
VCC1
9
U1
TQFN55-36
AAT2400
1
2
18
C2
2.2µF
CS7
17
VCC
3
16
CS8
GND
C1
4.7µF
50V
SGND
15
5
14
RSET
4
C5
0.68µF
C6
10µF
CS4
13
CS3
12
R3 12.1k R6 2k
6
11
7
10
EN
CS2
GND
D2
Red LED
CS1
VCC
9
R1
6.04k
8
3
2
1
Enable
GND
JP9
1
2
VCC1
CSFBi
JP4
1
2
3
CSFB
R10
10k
GND
SDO
SCLK
SDI
CSB
JP6
1
2
3
4
5
SP1
Figure 3: AAT2400 and AAT2401 DB1 Evaluation Board Schematic.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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25
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Figure 4: AAT2400 and AAT2401 Evaluation Board Top Side Layout.
Figure 5: AAT2400 and AAT2401 Evaluation Board Middle-1 Layer Layout.
26
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
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Figure 6: AAT2400 and AAT2401 Evaluation Board Middle-2 Layer Layout.
Figure 7: AAT2400 and AAT2401 Evaluation Board Bottom Side Layout.
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
27
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Evaluation Board Component Lists
Component
Part Number
U1
AAT2400IIH
R1
R2
R3, R5
R4
R6
C1
C2, C3
C4
C5
C6
C7
L1
D1
D2
JTAG1
JP1 - JP7
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
GRM31CR71H475K
GRM185R60J225KE26
GRM155R71H183KA12D
GRM188R71A684KA61D
GRM188R60J106M
50CE4R7BE
RLF12545T-100M5R1-PF
MBRD360G
LTST-C190CKT
HRP10H-ND
PRPN401PAEN
Description
8 channel white LED driver with current and timing
control (Master); 36 pin, 5x5 TQFN package
6.04kΩ, 1%, 1/4W; 0603
2kΩ, 1%, 1/4W; 0603
12.1kΩ, 1%, 1/4W; 0603
442kΩ, 1%, 1/4W; 0603
2kΩ, 5%, 1/4W; 0603
4.7µF, ±10%, 50V, X7R, 1206, 1.6mm
2.2µF, ±10%, 6.3V, X5R, 0603, 0.5mm
18nF, ±10%, 50V, X7R, 0402, 0.5mm
0.68µF, ±10%, 10V, X7R, 0603, 0.8mm
10µF, ±10%, 6.3V, X5R, 0603, 0.8mm
4.7µF 50V Aluminum Electrolytic Capacitor
Shield Drum Core, 10µH, 6A, 12.4mΩ
3.0A, 60V, SMA Schottky Barrier Rectifier
Red LED; 0603
Low profile 5x2 Con. Header, 2.54mm
Conn. Header, 2.54mm zip
Manufacturer
Skyworks
Vishay
Vishay
Vishay
Vishay
Vishay
Murata
Murata
Murata
Murata
Murata
Sanyo
TDK
On-Semi
Lite-On Inc.
Assmann
Sullins Electronics
Table 23: AAT2400 Evaluation Board Component Listing.
Component
Part Number
Description
U2
AAT2401IIH
R7
R8
R9
R10
C8
C9, C10
C11
C12
D3
JTAG2
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
GRM31CR71H475K
GRM185R60J225KE26
GRM188R71A684KA61D
GRM188R60J106M
LTST-C190CKT
HRP10H-ND
8 channel white LED driver with current and timing
control (Slave); 36 pin, 5x5 TQFN package
6.04kΩ, 1%, 1/4W; 0603
12kΩ, 1%, 1/4W; 0603
2kΩ, 5%, 1/4W; 0603
10kΩ, 5%, 1/4W; 0603
4.7µF, ±10%, 50V, X7R, 1206, 1.6mm
2.2µF, ±10%, 6.3V, X5R, 0603, 0.5mm
0.68uF, ±10%, 10V, X7R, 0603, 0.8mm
10µF, ±10%, 6.3V, X5R, 0603, 0.8mm
Red LED; 0603
Low profile 5x2 Conn. Header, 2.54mm
Manufacturer
Skyworks
Vishay
Vishay
Vishay
Vishay
MuRata
MuRata
MuRata
MuRata
Lite-On Inc.
Assmann
Table 24: AAT2401 Evaluation Board Component Listing.
Component
Part#
Description
Manufacturer
LED
Cable
SSC-ZWT715
H3CCS--1006G-ND
60mA LCD Backlighting LED
Double Ended Socket Cable
Seoul Semiconductor
Assmann
Table 25: Component Listing for LED Board.
28
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
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Register Summary Table
Name
Addr
Default
D7
D6
D5
D4
D3
D2
DOT1
DOT2
DOT3
DOT4
DOT5
DOT6
DOT7
DOT8
DOT9
DOT10
DOT11
DOT12
DOT13
DOT14
DOT15
DOT16
GS1 LSB
GS1 MSB
GS2 LSB
GS2 MSB
GS3 LSB
GS3 MSB
GS4 LSB
GS4 MSB
GS5 LSB
GS5 MSB
GS6 LSB
GS6 MSB
GS7 LSB
GS7 MSB
GS8 LSB
GS8 MSB
GS9 LSB
GS9 MSB
GS10 LSB
GS10 MSB
GS11 LSB
GS11 MSB
GS12 LSB
GS12 MSB
GS13 LSB
GS13 MSB
GS14 LSB
GS14 MSB
GS15 LSB
GS15 MSB
GS16 LSB
GS16 MSB
00h
02h
04h
06h
08h
0Ah
0Ch
0Eh
10h
12h
14h
16h
18h
1Ah
1Ch
1Eh
40h
42h
44h
46h
48h
4Ah
4Ch
4Eh
50h
52h
54h
56h
58h
5Ah
5Ch
5Eh
60h
62h
64h
66h
68h
6Ah
6Ch
6Eh
70h
72h
74h
76h
78h
7Ah
7Ch
7Eh
7Fh
7Fh
7Fh
7Fh
7Fh
7Fh
7Fh
7Fh
7Fh
7Fh
7Fh
7Fh
7Fh
7Fh
7Fh
7Fh
00h
04h
00h
04h
00h
04h
00h
04h
00h
04h
00h
04h
00h
04h
00h
04h
00h
04h
00h
04h
00h
04h
00h
04h
00h
04h
00h
04h
00h
04h
00h
04h
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
D1
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
1
9
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
D0
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
0
8
29
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Register Summary Table (continued)
Name
DLY1 LSB
DLY1 MSB
DLY2 LSB
DLY2 MSB
DLY3 LSB
DLY3 MSB
DLY4 LSB
DLY4 MSB
DLY5 LSB
DLY5 MSB
DLY6 LSB
DLY6 MSB
DLY7 LSB
DLY7 MSB
DLY8 LSB
DLY8 MSB
DLY9 LSB
DLY9 MSB
DLY10 LSB
DLY10 MSB
DLY11 LSB
DLY11 MSB
DLY12 LSB
DLY12 MSB
DLY13 LSB
DLY13 MSB
DLY14 LSB
DLY14 MSB
DLY15 LSB
DLY15 MSB
DLY16 LSB
DLY16 MSB
CTL1
CTL2
Fault1
Fault2
Fault3
Fault4
OTMP1
OTMP2
Fault Reporting
Fault Reporting
Fault Reporting
Fault Reporting
Test Modes
30
1
2
3
4
Addr
Default
D7
D6
D5
D4
D3
D2
D1
D0
80h
82h
84h
86h
88h
8Ah
8Ch
8Eh
90h
92h
94h
96h
98h
9Ah
9Ch
9Eh
A0h
A2h
A4h
A6h
A8h
AAh
ACh
AEh
B0h
B2h
B4h
B6h
B8h
BAh
BCh
BEh
C0h
C2h
E0h
E2h
E4h
E6h
E8h
EAh
F0h
F2h
F4h
F6h
FEh
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
AAh
AAh
AAh
AAh
00h
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
Bit 7
x
CS8 ON
CS16 ON
CS4
CS8
CS12
CS16
x
x
CS4
CS8
CS12
CS16
TM7
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
Bit 6
x
CS7 ON
CS15 ON
CS4
CS8
CS12
CS16
x
x
CS4
CS8
CS12
CS16
TM6
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
Bit 5
x
CS6 ON
CS14 ON
CS3
CS7
CS11
CS15
x
x
CS3
CS7
CS11
CS15
TM5
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
Bit 4
x
CS5 ON
CS13 ON
CS3
CS7
CS11
CS15
x
x
CS3
CS7
CS11
CS15
TM4
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
Bit 3
Bit 11
CS4 ON
CS12 ON
CS2
CS6
CS10
CS14
x
x
CS2
CS6
CS10
CS14
TM3
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
Bit 2
Bit 10
CS3 ON
CS11 ON
CS2
CS6
CS10
CS14
config
config
CS2
CS6
CS10
CS14
TM2
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
CS2 ON
CS10 ON
CS1
CS5
CS9
CS13
Bit 1
Bit 1
CS1
CS5
CS9
CS13
TM1
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
CS1 ON
CS9 ON
CS1
CS5
CS9
CS13
Bit 0
Bit 0
CS1
CS5
CS9
CS13
TM0
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
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
TQFN55-36
TQFN55-36
7WXYY
7XXYY
AAT2400IIH-T1
AAT2401IIH-T1
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Package Information
TQFN55-363
R = 0.1
3.600 ± 0.050
5.000 ± 0.050
Index Area
(D/2 x E/2)
C = 0.3
5.000 ± 0.050
3.600 ± 0.050
0.750 ± 0.050
0.200 ± 0.050
0.203 REF
Side View
0.450 ± 0.050
Bottom View
Top View
+ 0.050
0.000 - 0.000
Detail "A"
0.40 BSC
Detail "A"
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3. The leadless package family, which includes QFN, TQFN, DFN, TDFN, and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing
process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
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
31
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a
service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no
responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.
No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale.
THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR
PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES
NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM
THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper
use or sale.
Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product
design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.
Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for
identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.
32
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