Data Sheets - Skyworks Solutions, Inc.

EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
Introduction
The AAT2428 evaluation board is a hardware platform to evaluate the functions of the AAT2428, a 16-channel white
LED driver for LED current and timing control.
The AAT2428 operates over a 10.8V to 28V range. The LED input voltage range, VLED, is determined by the highest VF
(LED Forward Voltage) multiplied by the number of LEDs in a given string. The maximum VLED is limited to 50V. The
maximum VLED must be less than 50V to avoid damage to the AAT2428 on the demo board. The AAT2428 CSFBO and
ISCFB outputs provide both a voltage mode (CSFBO) for Skyworks regulators and a current mode (ICSFB) current
sense feedback for a third party system power supply.
The current sinks are setup in a bank of 4, 8, or 16 current sinks. Each bank is programmable via the SPI interface.
Full scale LED current is programmed using an external resistor, R1. DOT correction is applied to each bank independently with 8-bit resolution. Both phase delay and grayscale clock (GS Clock) PWM on-time are user programmable
with 12-bit resolution for each current sink bank. Timing and synchronization are determined by externally applied
VSYNC and GSCLK signals. The AAT2428 also provides an internal GSCLK signal that tracks with the VSYNC signal with
a 4192 ratio to VSYNC.
The AAT2428 is available in a small 7mm x 7mm QFN package. More details on the AAT2428 may be found in the
product datasheet. This document will cover the board schematic, layout guidelines and setup of a few key configuration registers to demonstrate the AAT2428 driving LED strings with different brightness levels. Scope shots to show
the corresponding relationships between related waveforms are also included.
Evaluation Board Pictures
Figure 1: AAT2428 Evaluation Board Picture.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
Board Schematic
AATI USB Module
EN
ADDR1
ADDR0
SGND
CSB
SCLK
VCC
VIN
EN
33
VIN
31
30
CSFBO
29
CSFBI
C5
4.7µF
50V
C3
2.2µF
C1
2.2µF
Header 10X2
GND
P3.3
GSCLK
P3.2
VSYNC
P3.1
1
2
SCLK
SDO
SDI
CSB
CS16
26
CS15
25
CS14
JP2
1
2
CSB
SDI
1
2
3
4
5
6
7
8
9 10
GSCLK
VSYNC
SDO
SCL K
JP5
1
3
2
4
GND
P2.7
P2.6
P2.5
P2.4
30
29
28
27
26
25
VIN
ADDR0
SDI
VLED
C7
DNP
GND
TP9
GND GND
TP10 TP11
CSFBO
1
2
3
4
5
2
4
ADDR1
SDI
P5
1
2
3
Header 5
GSCLK
VSYNC
P7
1
2
3
4
P9
1
2
CSFBI
TP1
P11
1
2
1
2
3
Header 3
1
2
3
4
Header 4
P10
VIN
1
2
Header 2
C8
DNP
P6
P8
VLED
Header 4
Header 2
CSFBO
Header 2
VIN
GND GND
TP6 TP8
P4
SCLK
SDO
SDI
CSB
Header 3
AGND
VIN
JP6
1
3
R4
DNP
Header 5X2
VCC
GND
1
2
3
4
5
Header 5
P2
AGND
P3
P12
1
2
Header 2
TP2
CSFBO
AGND
TP3
VLED
Parameter
Min
Input Voltage Range
VLED Voltage Range
VSYNC Frequency
GSCLK Frequency
SPI Clock Frequency
Ambient Temperature Range
Operating Junction Temperature Range
10.8
Typ
55
1024 · VSYNC
-40
-40
Max
28
50
1000
2M
15
85
150
Table 1: AAT2428 Evaluation Board Specifications.
2
31
JP1
Printed Circuit Board Specification
VIN
VLED
fVSYNC
fGSCLK
fSCLK
TA
TJ
32
1
2
Figure 2: AAT2428 Evaluation Board Schematic.
Symbol
34
33
24
23
22
21
20
USB Module
P2.3
GND
P2.2
P3.0
GND
P2.1
P1.3
CSFBI
28
27
VCC
CSFBI
CS13
CS12
CS11
CS10
CS9
CS8
CS7
CS6
CS5
GND
CS2
CS4
CS6
CS8
CS10
CS12
CS14
CS16
VLED
2
4
6
8
10
12
14
16
18
20
12
P3.4
35
JP4
ADDR1
1
3
5
7
9
11
13
15
17
19
11
SCL
ENABLE
VCC
GND
GND
CS1
CS3
CS5
CS7
CS9
CS11
CS13
CS15
VLED
C20
DNP
1
2
ADDR0
P1
10
P3.5
36
GSCLK
VCCIO
34
24
23
22
21
SGND
CS14
CS13
CS15
N/C
CS12
N/C
CS11
CS16
CS10
SGND
36
35
32
VSYNC
P3.6
19
SDI
SDI
SDO
DGND
GSCLK
EP
VSYNC
SGND
SGND
13
12
CSFBI
20
11
CS4
CS9
10
N/C
CSFBO
19
9
CS2
CS3
SGND
8
VIN
SGND
7
CS4
CS1
18
6
CS3
N/C
17
CS2
VCC
CS8
5
SGND
SGND
CS7
CS1
AGND
9
VSYNC
U1
AAT2428
VCCIO
16
AGND
4
RSET
ICSFB
CS6
3
C10
DNP
AGND
1
2
15
6.04k
14
C11
2.2µF
R1
FLT
R13
DNP D2
Diode 1N4148
C21
DNP
JP3
GSCLK
CSB
SDA
18
VSYNC
EN
ADDR1
AGND
DNP
37
38
40
39
41
42
43
44
45
48
R2
GSCLK
CS5
12.1k
47
49
D3
C12 DNP
DNP
46
AGND
DNP
R11
R5 R6 R7 R8
0
0
0
0
ADDR0
R9 R10
0
0
AGND
R12
SDO
R3
2k
FLT
TP5
FB-I
GSCLK
TP4
CSB
8
SCLK
D1
Red LED
VSYNC
7
P3.7
P2.0
6
SDI
17
5
CSB
VCC
3V
P1.5
4
SDO
P1.4
SDI
5V
16
3
SCLK
GND
SDO
GND
GND
15
2
14
SCLK
13
1
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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Units
V
Hz
MHz
°C
EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
Getting Started
Setup
1. Connect an input power source (to supply between 10.8V and 28V) between VIN and ground.
2. If using the Skyworks USB Module, connect the USB Module to USB Module connector on the AAT2428 demo board.
Otherwise, connect frequency generators to apply between 55Hz to 480Hz to VSYNC and the appropriate frequency to GSCLK, leading edge synchronized to VSYNC. Apply a frequency that has a minimum of 4096 · VSYNC frequency on GSCLK. Refer to the AAT2428 product datasheet to determine the correct GSCLK frequency for the
application operating condition. Connect SPI interface on P2.
3. Apply VLED. If VLED is in closed-loop operation and is applied from a third party SMPS converter, connect the FB-I for
current mode to the feedback input of the third party SMPS converter. Calculate the value of resistor R3 for desired
VLED level. If using an Skyworks boost converter, connect the CSFBO to the feedback input of the Skyworks boost
converter.
4. Connect JP1 jumper to ON to enable AAT2428.
5. Set ADDR0 and ADDR1 jumpers to desired address setting.
6. Connect LED strings to P1 using information provided in Table 2.
7. If desired, multiple AAT2428 demo boards with different device address settings can be cascaded together to drive
more than 16 LED channels as shown in Figure 3.
Pin
1
2
3
4
5
6
7
8
9
10
Description
GND
GND
Current
Current
Current
Current
Current
Current
Current
Current
Sink
Sink
Sink
Sink
Sink
Sink
Sink
Sink
1
2
3
4
5
6
7
8
Pin
11
12
13
14
15
16
17
18
19
20
Description
Current
Current
Current
Current
Current
Current
Current
Current
VLED
VLED
Sink
Sink
Sink
Sink
Sink
Sink
Sink
Sink
9
10
11
12
13
14
15
16
Table 2: P1 LED Pinout Configuration.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202328A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 3, 2012
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EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
Figure 3: AAT2428 PCB + LED Board Picture.
Figure 4: Multiple AAT2428 Demo Boards Cascaded Together to Drive More Than 16 LED Channels.
4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202328A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 3, 2012
EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
Functional Test and Evaluation
RSET and DOT Register
The RSET resistors, R1, on the AAT2428 is 6.04kΩ, and set the maximum full scale LED current to 101.72mA. The DOT
correction register provides 256 linear steps between current sink being off and the maximum full scale LED current to
adjust the luminance of the LEDs.
Figure 4 shows the LED current at its full scale setting with DOT register sets to 0xFF. Figure 5 shows the LED current
at its half scale setting with DOT register sets to 0x80.
Figure 5: LED Current with DOT = 0xFF.
Figure 6: LED current with DOT = 0x80.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
GS Registers
The GS registers control the PWM duty cycle of the LED current sinks for adjusting the brightness. Figure 6 shows a
LED string running at 50% duty with GS register sets to 0x800. Figure 7 shows a LED string running at 25% duty with
GS register sets to 0x400. Figure 8 shows a LED string running at 75% duty with GS register sets to 0xC00.
Figure 7: PWM at 50% Duty Cycle with GS = 0x800.
Figure 8: PWM at 25% Duty Cycle with GS = 0x400.
6
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
Figure 9: PWM at 75% Duty Cycle with GS=0xC00.
DLY Registers
The DLY registers set the phase shift from the rising edge of VSYNC to when the current sink PWM cycle begins for each
LED current sink. Figure 9 shows a phase shift of 0° with DLY register setting to 0x000. Figure 10 shows a phase shift
of 90° with DLY register sets to 0x400. Figure 11 shows a phase shift of 180° with DLY register setting to 0x800. Figure
12 shows a phase shift of 270° with DLY register setting to 0xC00. Figure 13 shows a phase shift of 360° with DLY
register setting to 0xFFF. One advantage of using delay is that it allows each current sink to start at different time to
reduce the stress on a system power supply. The other advantage is that it can provide a fixed off time in scanning
mode when the delay is used in combination with the INVERT function.
Figure 10: 0° Phase Shift with DLY = 0x000.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
Figure 11: 90° Phase Shift with DLY = 0x400.
Figure 12: 180° Phase Shift with DLY = 0x800.
8
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
Figure 13: 270° Phase Shift with DLY = 0xC00.
Figure 14: 360° Phase Shift with DLY = 0xFFF.
INVERT Function
The INVERT function allows the PWM signal to be inverted. A 25% duty cycle (GS = 0x400) with the INVERT function
enabled will be a 75% duty cycle output. A 90° delay turn-on time (DLY = 0x400) with the INVERT function enabled
will have a turn-on time at 90°. The INVERT function can provide a fixed off time in scanning mode. Figure 14 and 15
show two PWM waveforms with INVERT function disabled, sharing the same turn-on time with different duty cycle.
Figure 16 and 17 show two PWM waveforms with the same setting as Figure 16 and 17 with INVERT function enabled.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
Figure 15: Non-Inverted 20% Duty Cycle with 45° Phase Shift Turn-On Time
(GS = 0x333, DLY = 0x200, INVERT = 0).
Figure 16: Non-Inverted 80% Duty Cycle with 45° Phase Shift Turn-On Time
(GS = 0xCCC, DLY = 0x200, INVERT = 0).
10
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202328A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 3, 2012
EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
Figure 17: Inverted 20% Duty Cycle with 45° Phase Shift Turn-Off Time
(GS = 0x333, DLY = 0x200, INVERT = 1).
Figure 18: Inverted 80% Duty Cycle with 45° Phase Shift Turn-Off Time
(GS = 0xCCC, DLY = 0x200, INVERT = 1).
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202328A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 3, 2012
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EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
Open and Short Fault Detection
The AAT2428 provides the open and short fault detection to detect any LED that is open or short. The fault status is
indicated by the FLT pin and Fault Status registers. The AAT2428 has a programmable open fault blanking time. The
blanking time can be programmed to 2, 4, 8, or 16 VSYNC cycles to prevent any false fault detection due to the slow
system response from SMPS at PWM startup. The AAT2428 does not provide short fault blanking time.
The AAT2428 has an open fault clear bit and a short fault clear bit. By setting the fault clear bit, the fault status is
removed and any further fault will not be detected until the bit is reset back to 0.
Figure 18, 19, 20 and 21 show the 2, 4, 8, and 16 VSYNC blanking time settings in open fault detection. Figure 22
shows the short fault detection without any VSYNC blanking time.
Figure 19: Open Fault with the 2 VSYNC Blanking Time.
Figure 20: Open Fault with the 4 VSYNC Blanking Time.
12
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202328A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 3, 2012
EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
Figure 21: Open Fault with the 8 VSYNC Blanking Time.
Figure 22: Open Fault with the 16 VSYNC Blanking Time.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202328A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 3, 2012
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EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
Figure 23: Short Fault Detection – No VSYNC Blanking.
14
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202328A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 3, 2012
EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
Layout Guidelines
Follow the guidelines below to ensure proper operation of the AAT2428:
1. Maintain a ground plane and connect to the IC GND pin(s), and minimize the distance from the input capacitor
negative terminal to the GND pins.
2. Consider additional PCB GND exposed area for the AAT2428 to maximize heat sinking capability. Connect the EP
(bottom of the die) to GND. Connect GND and SGND as close as possible to the package and maximize the heat
sinking space for overall performance.
3. Maximize package thermal dissipation and power handling capacity of the QFN77-48 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 thermal
vias with 0.3mm hole size and 1.2mm spacing between the vias (Refer to Figures 2 and 3) on the thermal landing
would help transfer heat to the bottom GND plane of the PCB effectively.
Component
U1
C5
C1, C3, C11
D2
R1
R3
R11
R5, R6, R7, R8, R9, R10
JP1, JP2, JP3, JP4
JP5, JP6
P1
P2
P3, P5, P7, P9, P11
P4, P6, P8, P10, P12
Part Number
Description
AAT2428
UMK316BJ475KL-T
GRM188R61C225KE15D
LL4148-13
CRCW06036K04FKEA
CRCW060310K0FKEA
CRCW060312K1FKEA
CRCW06030000Z0EA
TSW-120-08-G-D
TSW-120-08-G-D
HRP10H-ND
AWHW20G-0202-T-R
801-43-050-20-001000
802-10-064-20-001000
16 Channels White LED Driver
Cap Cer 4.7μF 50V X5R 1206
Cap Cer 2.2μF 16V X5R 0603
Diode Switch 75V 500MW MINIMELF
Res 6.04KΩ 1/10W 1% 0603 SMD
Res 10KΩ 1/10W 1% 0603 SMD
Res 12.1KΩ 1/10W 1% 0603 SMD
Res 0Ω 1/10W 1% 0603 SMD
Conn. Header 2 Pos, 2.54mm
Conn. Header 4 Pos, 2.54mm
Header 5x2-Pin, Dual Row, 2.54mm
Header 10x2-Pin, Dual Row, 2.54mm
Right Angle Conn Socket, 2.54mm
Right Angle Header, 2.54mm
Manufacturer
Skyworks
Taiyo Yuden
Murata
Diode Inc.
Vishay
Samtec, Inc.
Assmann
Mill-Max
Table 3: AAT2428 Evaluation Board BOM.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith LED Current and Timing Control
Figure 24: AAT2428IDX (7mm × 7mm TDFN) Evaluation Board Layout – Top Layer.
Figure 25: AAT2428IDX (7mm × 7mm TDFN) Evaluation Board Layout – Bottom Layer.
16
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202328A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 3, 2012
EVALUATION BOARD DATA SHEET
EV191
Evaluation Board for the AAT2428
Sixteen-Channel White LED Driver Solutionwith 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.
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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
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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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202328A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 3, 2012
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