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參數(shù)資料
| 型號： | LP5520TLX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | RGB Backlight LED Driver |
| 中文描述： | LED DISPLAY DRIVER, PBGA25 |
| 封裝： | 2.77 X 2.59 MM, 0.60 MM HEIGHT, SMD-25 |
| 文件頁數(shù)： | 9/34頁 |
| 文件大?。?/td> | 790K |
| 代理商： | LP5520TLX |
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RGB Driver Functionality
WHITE BALANCE CONTROL
LP5520 is designed to provide spectrally rich white light using
a three color RGB LED. White light is obtained when the Red,
Green and Blue LED intensities are in proper balance. The
LED intensities change independently with temperature. For
maintaining the purity of the white color and the targeted total
intensity, precise temperature dependent intensity control for
each LED is required. The color coordinates in this document
refer to the CIE 1931 color graph (x,y system).
CIE 1931 Color Graph
20186197
The Intensity vs. Temperature graph shows a typical RGB
LED intensity behavior on a 12-bit scale (0 to 4095) at con-
stant 20mA LED currents. The next graph shows the typical
color coordinate change for an uncompensated RGB LED.
The Compensation PWM Values graph shows the corre-
sponding PWM values for achieving constant intensity white
light across the temperature range. The PWM values have
been saturated at 104°C to avoid overheating the LED and to
better utilize the PWM range. The white balance is not main-
tained above 104°C in this case.
LED Intensity vs. Temperature
20186134
Typical Color Coordinates vs. Temperature for
uncompensated RGB LED
20186199
The compensation values for the measured temperatures can
be easily calculated when the intensity vs. temperature infor-
mation is available. For the best accuracy the iterative cali-
bration approach should be used. The calibration procedure
is described in the Application Note AN1459, LP5520 RGB
Backlight Driver Calibration.
Compensation PWM Values
20186135
The compensation values need to be converted to 16°C in-
tervals when they are programmed to the calibration EEP-
ROM. The evaluation software has import function, which can
be used to convert the measured compensation data to the
16°C interval format. The measured data can have any tem-
perature points and the software will fit a curve through the
measured points and calculate new PWM values in fixed tem-
peratures using the curves. The procedure is explained in the
Application Note AN1462, LP5520 RGB Backlight Driver
Evaluation Kit. By using the evaluation software to convert the
measurement results to EEPROM memory map the user
does not need to care about the details of the EEPROM struc-
ture.
Typical color coordinate and intensity stability over tempera-
ture are shown in the following two graphs.
9
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP5520TLX/NOPB | 功能描述:LED照明驅(qū)動器 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| LP5521 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Programmable Three Channel LED Driver |
| LP5521TM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Programmable Three Channel LED Driver |
| LP5521TM/NOPB | 功能描述:LED照明驅(qū)動器 3 Ch Prog Led Driver 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| LP5521TMEV | 功能描述:電源管理IC開發(fā)工具 LP5521TMEV EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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