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參數(shù)資料
| 型號(hào)： | LM27966SQ |
| 廠(chǎng)商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | White LED Driver with I2C Compatible Interface |
| 中文描述： | LED DISPLAY DRIVER, QCC24 |
| 封裝： | 4 X 4 MM, 0.80 MM HEIGHT, LLP-24 |
| 文件頁(yè)數(shù)： | 10/13頁(yè) |
| 文件大?。?/td> | 673K |
| 代理商： | LM27966SQ |
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Circuit Description
(Continued)
Bit7 to Bit 5: Not Used
DAUX1-DAUX0: Sets Brightness for D
AUX
pin. 11 = Fullscale
Brightness Level Control Table (Main Display)
Bit7 to Bit2:Not Used
Full-Scale Current set externally by the following equation:
I
Dx
= 200 x 1.25V / R
SET
Brightness Code (hex)
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
16
17
18
19
1A
1B
1C
1D
1E
1F
Analog Current (% of
Full-Scale)
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
40
40
40
40
40
40
40
70
70
70
70
70
70
100
100
100
Duty Cycle (%)
1/16
2/16
3/16
4/16
5/16
6/16
7/16
8/16
9/16
10/16
11/16
12/16
13/16
14/16
15/16
16/16
10/16
11/16
12/16
13/16
14/16
15/16
16/16
11/16
12/16
13/16
14/16
15/16
16/16
13/16
15/16
16/16
Perceived Brightness
Level (%)
1.25
2.5
3.75
5
6.25
7.5
8.75
10
11.25
12.5
13.75
15
16.25
17.5
18.75
20
25
27.5
30
32.5
35
37.5
40
48.125
52.5
56.875
61.25
65.625
70
81.25
93.75
100
D
AUX
Brightness Levels (%of Full-Scale) = 20%, 40%, 70%,
100%
Application Information
SETTING LED CURRENT
The current through the LEDs connected to Dx can be set to
a desired level simply by connecting an appropriately sized
resistor (R
) between the I
pin of the LM27966 and
GND. The Dx currents are proportional to the current that
flows out of the I
pin and are a factor of 200 times greater
than the I
current. The feedback loops of the internal
amplifiers set the voltage of the I
pin to 1.25V (typ.). The
statements above are simplified in the equations below:
I
Dx
= 200 x (V
ISET
/ R
SET
)
R
SET
= 200 x (1.25V / I
Dx
)
Once the desired R
SET
value has been chosen, the
LM27966 has the ability to internally dim the LEDs using a
mix of Pulse Width Modulation (PWM) and analog current
scaling. The PWM duty cycle is set through the I
2
C compat-
ible interface. LEDs connected to Main Display current sinks
(Dx) can be dimmed to 32 different levels/duty-cycles. The
internal PWM frequency for Main Display is a fixed 20kHz.
D
AUX
has 4 analog current levels.
Please refer to the I
2
C Compatible Interface section of this
datasheet for detailed instructions on how to adjust the
brightness control registers.
L
www.national.com
10
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM27966SQ | 制造商:Texas Instruments 功能描述:LED DRIVER I2C CONTROL POWERWISE |
| LM27966SQ/NOPB | 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM27966SQX | 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM27966SQX/NOPB | 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM2796TL | 制造商:Texas Instruments 功能描述:LED DRVR 7Segment 3.3V/5V 18-Pin uSMD T/R |
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