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參數資料
| 型號： | LP5520 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | LED驅動器 |
| 英文描述： | RGB Backlight LED Driver |
| 中文描述： | RGB背光LED驅動器 |
| 文件頁數： | 1/34頁 |
| 文件大小： | 790K |
| 代理商： | LP5520 |
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May 2007
LP5520
RGB Backlight LED Driver
General Description
The LP5520 is an RGB backlight LED driver for small format
color LCDs. RGB backlight enables better colors on the dis-
play and power savings compared with white LED backlight.
LP5520 offers small and simple driver solution without need
for optical feedback. Calibration in display module production
can be done in one temperature. LP5520 produces true white
light over wide temperature range. Three independent LED
drivers have accurate programmable current sinks and PWM
modulation control. Using internal calibration memory and
external temperature sensor, the RGB LED currents are ad-
justed for perfect white balance independent of the brightness
setting or temperature. The user programmable calibration
memory has intensity vs. temperature data for each color.
This white balance calibration data can be programmed to the
memory on the production line of a backlight module.
The device has a magnetic boost converter that creates up to
20V LED supply voltage from the battery voltage. The output
can be set at 1V step from 5V to 20V. In adaptive mode the
circuit automatically adjusts the output voltage to minimum
sufficient level for lowest power consumption.
Temperature is measured using an external temperature sen-
sor placed close to the LEDs. The second ADC input can be
used e.g. for ambient light measurement.
LP5520 is available in 25 pin microSMD package.
Features
■
Temperature compensated LED intensity and color
■
Individual calibration coefficients for each color
■
Color accuracy
Δ
X and
Δ
Y
≤
0.003
■
12 bit ADC for measurement of 2 sensors
■
Adjustable current outputs for R, G and B LED
■
0.2% typical LED output current matching
■
PWM control inputs for each color
■
SPI and I
2
C compatible interface
■
Stand-alone mode with 1 wire control
■
Sequential mode for one color at a time
■
Magnetic high efficiency boost converter
■
Programmable output voltage from 5V to 20V
■
Adaptive output voltage control option
■
< 2 μA typical shutdown current
■
MicroSMD-25 package, 2.77 × 2.59 × 0.6mm
Applications
■
Color LCD display backlighting
■
LED lighting applications
■
Non-linear temperature compensation
■
Ambient light compensation
Typical Application
20186107
2007 National Semiconductor Corporation
201861
www.national.com
L
相關PDF資料 |
PDF描述 |
|---|---|
| LP5520TL | RGB Backlight LED Driver |
| LP5520TLX | RGB Backlight LED Driver |
| LP5521 | Programmable Three Channel LED Driver |
| LP5521TM | Programmable Three Channel LED Driver |
| LP5521TMX | Programmable Three Channel LED Driver |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LP5520TL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:RGB Backlight LED Driver |
| LP5520TL/NOPB | 功能描述:LED照明驅動器 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 |
| LP5520TLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:RGB Backlight LED Driver |
| LP5520TLX/NOPB | 功能描述:LED照明驅動器 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 |
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