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參數(shù)資料
| 型號： | AAT1236IRN-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | High Efficiency White LED Drivers for Backlight and Keypad |
| 中文描述： | 高效率白光LED的背光和鍵盤驅(qū)動程序 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 1009K |
| 代理商： | AAT1236IRN-T1 |
AAT1236
High Efficiency White LED Drivers
for Backlight and Keypad
16
1236.2007.02.1.1
Constant Current Setting
The LED current is controlled by the R
SET
resistor.
For maximum accuracy, a 1% tolerance resistor is
recommended. Table 2 shows the R
SET
resistor
value for AAT1236 for various LED full-scale cur-
rent levels.
Table 2: Maximum LED Current and R
SET
Resistor Values (1% Resistor Tolerance).
Maximum LED current per channel versus R
SET
value is shown in Figure 7.
Figure 7: LED Current vs. R
SET
Values.
L
R
SET
(k
Ω
)
0
5
10
15
20
25
30
35
10
36
62
88
114
140
166
192
218
244
270
I
LED
(mA)
30
25
20
15
10
5
R
SET
(k
Ω
)
14.7
17.4
22.6
29.4
44.2
93.1
Figure 8: A AAT1236-based High Efficiency White LED Driver Schematic.
1
2
3
RTN
VIN
VOUT
AGND
SCL
SDA
SW
12
11
10
9
GND
8
RSET
IN
6
7
B2
5
B1
4
EN
3
OV
2
VIN
1
A3
13
A2
14
A1
15
LIN
16
U1
1
2
SDA
SCL
L1: 2.2μH Taiyo Yuden NR4018T2R2M
C1: 0805 10V 2.2μF X7R GRM21BR71A225KA01
C2: 0805 25V 2.2μF X7R GRM21BR71E225KA73L
LED1-24: OSRAM LW M673 or equivalent
LED1
LED2
LED3
LED4
LED6
LED7
LED8
LED9
LED11
LED12
LED13
LED14
LED16
LED17
LED18
LED19
LED21
LED22
LED23
LED24
JP1
0
JP2
0
JP3
0
JP4
0
JP5
0
JP6
0
JP7
0
JP8
0
JP9
0
JP10
0
C2
2.2μF
25V
C1
2.2μF
R4
4.7k
(optional)
R5
4.7k
(optional)
R3
12.1k
R1
22.6k
R2
187k
D1
MBR0530T1
SW_Node
Enable/Set
JP6
JP7
L1
2.2μH
AAT1236_TDFN3X4
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