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PDF AAT1401 Data sheet ( Hoja de datos )
| Número de pieza | AAT1401 | |
| Descripción | Serial LED Driver | |
| Fabricantes | Skyworks | |
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DATA SHEET
AAT1401
Serial LED Driver with Filtered PWM and 32-Step S2C Dimming Control
General Description
The AAT1401 is a step-up single channel LED driver with
an input voltage range of 2.7V to 5.5V. The wide input
voltage range, small solution size, advanced dimming
features and high efficiency is suitable for LED backlight
solutions for single cell Li-ion based equipment. A preci-
sion, high voltage current sink maintains the maximum
LED current set by an external resistor from 10 to 31mA.
The high switching frequency supports ultra small, low
cost filtering components.
Two dimming controls are available; 32 dimming steps
using the S2Cwire™ interface, and filtered PWM control.
The frequency range of the PWM dimming extends up to
100 kHz eliminating audible noise and suitable for CABC
(Content Adaptive Brightness Control) applications.
The device includes over-temperature protection and
programmable over-voltage protection and recovers
automatically when the faults are removed. The AAT1401
is available in a 10-pin wafer-level chip scale package
(WLCSP) and is rated over the -40°C to +85°C tempera-
ture range.
Features
• Input Voltage Range: 2.7 to 5.5V
• Drives up to 28V with 6 Series LEDs at 31mA
• 1MHz Switching Frequency Allows Small External
Components
• Up to 85% Efficiency
• Dimming Control Options:
▪ 32 Steps - S2Cwire Single Wire Interface
▪ Filtered PWM
• Low Operating Current at 2.3mA
• Shutdown Current < 1µA
• Over-Voltage Protection for Open-LED Faults
• Over Temperature Protection
• Ultra Small, Low Profile 10-pin 1.55 x 1.15mm WLCSP
Package
Applications
• Digital Still Cameras (DSC)
• Mobile Handsets
• Netbooks and Notebooks
• Portable Media Players
• White LED Drivers
Typical Application
VIN:
2.7V–5.5V
CIN
4.7µF
CCOMP
56nF
D1
L1 10μH
S2C
PWM
RSET
10k
IN
LX
OVP
AAT1401
EN/SET
PWM
COMP
RSET
CS
GND PGND
R1
R2
Up to 6
WLEDs
VOUT:
Up to 28V
at 31mA
COUT
0.1µF
50V
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202113A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 27, 2012
1
1 page  
DATA SHEET
AAT1401
Serial LED Driver with Filtered PWM and 32-Step S2C Dimming Control
Typical Characteristics
Quiescent Current vs. Input Voltage
500
480
460
440
420
85°C
400 25°C
-40°C
380
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
Shutdown Current vs. Input Voltage
0.10
85°C
0.08
25°C
-40°C
0.06
0.04
0.02
0.00
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
Efficiency vs. Output Current
(RSET = 10KΩ, L = 10µH, 6 LEDs)
90
85
80
75
70
65
60
55
VIN = 2.7V
VIN = 3.0V
50 VIN = 3.6V
45 VIN = 4.2V
40 VIN = 5.0V
35 VIN = 5.5V
30
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32
Output Current (mA)
LED Current Accuracy vs. S2C
(VIN = 3.6V, L = 10µH)
32
RSET = 10KΩ
28 RSET = 15KΩ
24 RSET = 20KΩ
RSET = 25KΩ
20 RSET = 30KΩ
16
12
8
4
0
1 5 9 13 17 21 25 29 33
S2C Data
Sink Current Accuracy vs. Temperature
(VIN = 3.6V, RSET = 15kΩ)
22.0
21.2
20.4
19.6
18.8
18.0
-40
-15 10 35 60
Temperature (°C)
85
Sink Current Accuracy vs. Temperature
(VIN = 3.6V, RSET = 10kΩ)
32.0
31.6
31.2
30.8
30.4
30.0
-40
-15 10 35 60
Temperature (°C)
85
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202113A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 27, 2012
5
5 Page 
DATA SHEET
AAT1401
Serial LED Driver with Filtered PWM and 32-Step S2C Dimming Control
Application Information
LED Current Setting
The maximum LED current is determined by value of the
external resistor RSET from 10mA to 31mA. The value of
RSET is determined by the voltage of RSET and the LED
current, and can be calculated by:
RSET
=
VSET · 258
ILED
Where VSET = 1.2V. Table 1 lists examples of standard 1%
metal film RSET values for different maximum LED current
requirements.
Maximum LED Current (mA)
31
20
15
12
10
RSET (kΩ)
10
15
20
25
30
Table 1: Examples of Standard 1% RSET Values for
Setting Maximum LED Current Levels.
LED current dimming is controlled either via the S2Cwire
single-wire interface through the EN/SET pin in 32 steps
or via PWM control with varied duty cycle up to 100kHz
frequency. The S2Cwire interface programs the LED cur-
rent from the maximum LED current set by RSET to 2%
of the maximum LED current as shown in Table 2.
S2Cwire
Data
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
LED Current
(% IMAX)
100
97
94
90
87
84
81
77
74
71
68
65
61
58
55
52
S2Cwire
Data
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
LED Current
(% IMAX)
48
45
42
39
35
32
29
26
23
19
16
13
10
6
3
2
Table 2: S2Cwire Dimming Control
Current Settings.
Figure 2 illustrates the LED current value at different
S2Cwire code settings when RSET is 15kΩ with a maxi-
mum LED current of 20mA.
22
20
18
16
14
12
10
8
6
4
2
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
ILED (mA)
Figure 2: S2Cwire Dimming Control
at Maximum LED Current (20mA max).
Filtered PWM Dimming
The AAT1401 provides a PWM input as an additional
means of providing dimming control for CABC applica-
tions. The LED current reduces percentage linearly as
the duty cycle decreasing. Frequencies of up to 100kHz
can be applied. To avoid output flicker and noise, the
input control PWM frequency is filtered by the low pass
filter composed of the error amplifier and the external
compensation capacitor.
Figure 3 shows the LED current dimming controlled by
varying the PWM duty cycle at RSET = 15kΩ.
20
18
16
14
12
10
8
6
4
2
0
100 90 80 70 60 50 40 30 20 10
PWM Duty Cycle (%)
0
Figure 3: Filtered PWM Dimming Duty Cycle vs.
Maximum LED Current (20mA max).
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202113A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 27, 2012
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet AAT1401.PDF ] | |
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