Post on 15-May-2018
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EV176EVALUATION BOARD DATA SHEET
Evaluation Board for the AAT1409/7/5 Eight/Six/Four-Channel LED Backlight Driverwith Integrated Boost and High Frequency Direct PWM Dimming
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202317A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 30, 2012
Introduction The AAT1409/07/05 evaluation board provides a platform for evaluating the family of 8-channel / 6-channel / 4-chan-nel LED backlight drivers. The PCB layout has been optimized for portable device applications with a minimum number of external components in a small area. The design operates across an input voltage range of 4.5V to 5.5V (if VIN = VCC) or 5.0V to 26V (if VIN is connected only with VCC open).
Schematics
R3442k
R412.1k
MSS1P6
D1VIN5V - 26V
C42.2µF50V0805
R27.5k
R14.99k
C110µF35V
C22.2µF10V C3
15nF
JP4
JP2
VOUT
PWM5
CS2 7
GN
D
CS1 6
CS3 8
CS4 9
SG
ND
CS5 11RSET15
COMP16
OVP 17
GN
D
GN
D
FSET2
SYNC1CS6 12
CS7 13
CS8 14
LX
19
PG
ND
GN
DIN24EN23
VCC22
AAT1409
U1TQFN34-24
10 LEDs in series
4310 18 21 20E
P
L1 Sumida, CDRH5D28RHPNP-4R7N, 4.7μH, 3.7A, DCR = 43.1mΩD1 Vishay, Schottky Barrier Diode, MSS1P6, 1A, 60VC1 Taiyo Yuden, GMK325BJ106KN-T, 10μF, 35V, X5R,1210; OR Murata GRM32ER71H106K, 10μF, 50V, X7R, 1210C2 2.2μF, 10V, 0603C3 Cap, 15nF, 10V, 0603C4 Murata, GRM31CR71H225KA88L, 2.2μF, 50V, X7R, 1206R1, R2, R3, R4 Carbon Film resistors, 1%, 0603
L1 4.7μH
JP1
JP3
Figure 1: AAT1409 Evaluation Board Schematic.
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EV176EVALUATION BOARD DATA SHEET
Evaluation Board for the AAT1409/7/5 Eight/Six/Four-Channel LED Backlight Driverwith Integrated Boost and High Frequency Direct PWM Dimming
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202317A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 30, 2012
R3442k
R412.1k
MSS1P6
D1VIN5V - 26V
C42.2µF50V0805
R27.5k
R14.99k
C110µF35V
C22.2µF10V C3
15nF
JP5
JP2
VOUT
PWM5
CS2 7
GN
D
CS1 6
CS3 8
CS4 9
SG
ND
CS5 11RSET15
COMP16
OVP 17
GN
D
GN
D
FSET2
SYNC1CS6 12
GND 13
GND 14
LX
19
PG
ND
GN
D
IN24EN23
VCC22
AAT1407
U1TQFN34-24
10 LEDs in series
4310 18 21 20E
P
L1 Sumida, CDRH5D28RHPNP-4R7N, 4.7μH, 3.7A, DCR = 43.1mΩD1 Vishay, Schottky Barrier Diode, MSS1P6, 1A, 60VC1 Taiyo Yuden, GMK325BJ106KN-T, 10μF, 35V, X5R,1210; OR Murata GRM32ER71H106K, 10μF, 50V, X7R, 1210C2 2.2μF, 10V, 0603C3 Cap, 15nF, 10V, 0603C4 Murata, GRM31CR71H225KA88L, 2.2μF, 50V, X7R, 1206R1, R2, R3, R4 Carbon Film resistors, 1%, 0603
L1 4.7μH
JP1
JP3
Figure 2: AAT1407 Evaluation Board Schematic.
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EV176EVALUATION BOARD DATA SHEET
Evaluation Board for the AAT1409/7/5 Eight/Six/Four-Channel LED Backlight Driverwith Integrated Boost and High Frequency Direct PWM Dimming
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202317A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 30, 2012
R3442k
R412.1k
MSS1P6
D1VIN5V - 26V
C42.2µF50V0805
R27.5k
R14.99k
C110µF35V
C22.2µF10V C3
15nF
JP5
JP2
VOUT
PWM5
CS2
9
GN
D
CS1
8
CS3
6
CS4
7
SG
ND
GNDGNDGNDGND
11
RSET15
COMP16
OVP 17
GN
D
GN
D
FSET2
SYNC1
12
1314
LX
19
PG
ND
GN
D
IN24EN23
VCC22
AAT1405
U1TQFN34-24
4 LEDs in series
4310 18 21 20E
P
L1 Sumida, CDRH5D28RHPNP-4R7N, 4.7μH, 3.7A, DCR = 43.1mΩD1 Vishay, Schottky Barrier Diode, MSS1P6, 1A, 60VC1 Taiyo Yuden, GMK325BJ106KN-T, 10μF, 35V, X5R,1210; OR Murata GRM32ER71H106K, 10μF, 50V, X7R, 1210C2 2.2μF, 10V, 0603C3 15nF, 10V, 0603C4 Murata, GRM31CR71H225KA88L, 2.2μF, 50V, X7R, 1206R1, R2, R3, R4 Carbon Film resistors, 1%, 0603
L1 4.7μH
JP1
JP3
Figure 3: AAT1405 Evaluation Board Schematic.
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EV176EVALUATION BOARD DATA SHEET
Evaluation Board for the AAT1409/7/5 Eight/Six/Four-Channel LED Backlight Driverwith Integrated Boost and High Frequency Direct PWM Dimming
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202317A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 30, 2012
Test Equipment1. Unit under test (UUT) is the AAT1409/07/05 Evaluation Board.2. One (1) XT30-2 Power Supplies or equivalent.3. One PWM Function Generator. 4. One Fluke 189 multi-meter or equivalent to measure the output voltage.5. Miscellaneous test leads (banana plug to clip lead type is recommended).
Setup and Test
Quick Setup Guide1. Configure and verify the evaluation board as shown in Figure 4 prior to applying any power.2. Verify the jumper JP1 at ON position; disable the synchronization function using jumper JP2; set the switching
frequency either at 675kHz (Lo) or 1.3MHz (Hi) using JP3.3. Connect a function generator to JP4 with the PWM amplitude from 0V to 5V, the PWM frequency range from 100Hz
to 100 kHz, and the PWM duty cycle range from 1% to 99%. 4. Connect a 12V power supply to the input voltage (VIN), and connect an appropriate WLED board to the “to LED
Panel” terminal on the board. 5. Turn on the Power Supply; the LED panel should be turn ON.6. Vary the PWM frequency while monitoring the LED dimming, and vary the dimming of the LED panel by adjusting
the PWM duty cycle.
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EV176EVALUATION BOARD DATA SHEET
Evaluation Board for the AAT1409/7/5 Eight/Six/Four-Channel LED Backlight Driverwith Integrated Boost and High Frequency Direct PWM Dimming
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202317A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 30, 2012
Setting Over-Voltage Protection (OVP) The resistor divider must be selected so that the voltage at the OVP pin exceeds the OVP rising threshold at VOUT(MAX)
and the maximum LX voltage does not exceed its maximum value (50V). Therefore, the value of R3 should be chosen within the range of the following equation:
R4 · < R3 < R4 · - 1VCSX + N · VFLED(MAX) - VOVP(MIN)
VOVP(MIN)
50VVOVP(MAX)
Where:
R4 = 12.1kΩ is selected for minimizing losses without degrading noise immunity.N is the number of LEDs in each string.VOVP(MIN) = 1.1V is minimum over-voltage threshold.VOVP(MAX) = 1.3V is maximum over-voltage threshold.VCSX = 0.5V is the current sink voltage.VFLED(MAX) is the maximum forward LED voltage at 20mA.
For example, if the number of the white LED in each string is N =11, the resistor divider R3 can be calculated by select-ing R4 = 12.1kΩ:
12.1kΩ · < R3 < 12.1kΩ · - 10.5V + 11 · 3.7V - 1.1
1.150V1.3V
441.1kΩ < R3 < 453.3kΩ; choose R3 = 442kΩ (closest 1% value)
Check the maximum output voltage with the selected values of R4, R3:
VOUT(MAX) = VOVP(MAX) · = 1.3V · = 48.8V < 50V+ 1R3
R4+ 1
442kΩ12.1kΩ
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EV176EVALUATION BOARD DATA SHEET
Evaluation Board for the AAT1409/7/5 Eight/Six/Four-Channel LED Backlight Driverwith Integrated Boost and High Frequency Direct PWM Dimming
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202317A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 30, 2012
1. AAT1409 only.
LED Current Sink SettingThe current sink is set by the R2 resistor:
R2 = 264 · VRSET
ICSX(MAX) =
264 · 0.6VICSX(MAX)
Where VRSET = 0.6V
For example, if the maximum current for each string LEDs is 30mA, this corresponds to a minimum resistor of 5.23kΩ.
R2 = = 5.23kΩ264 · 0.6V
30mA
Maximum ILED Current (mA) R2 (kΩ)451 3.4830 5.2325 6.1920 7.8715 10.510 15.85 31.6
Table 1. Maximum LED Current Sink vs. RSET Resistor (R2) Values.
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EV176EVALUATION BOARD DATA SHEET
Evaluation Board for the AAT1409/7/5 Eight/Six/Four-Channel LED Backlight Driverwith Integrated Boost and High Frequency Direct PWM Dimming
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202317A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 30, 2012
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1. Applied the same for both AAT1407 and AAT1405 evaluation boards.
Figure 4: AAT1409 Evaluation Board Quick Setup Guide Connection Diagram1.
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