參數(shù)資料
型號： LP5526TLX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 顯示驅(qū)動器
英文描述： 4 Mbit Uniform Sector, Serial Flash Memory
中文描述： LED DISPLAY DRIVER, PBGA25
封裝： 2.54 X 2.54 MM, 0.60 MM HEIGHT, 0.50 MM PITCH, BGA-25
文件頁數(shù)： 15/33頁
文件大?。?/td> 1150K
代理商： LP5526TLX
Functionality of Color LED
Outputs (RLED, GLED, BLED)
(Continued)
FLASH LED DRIVING USING RGB DRIVERS
RGB drivers can be connected in parallel and used as a
flash LED driver (see Typical application 2). Flash LEDs can
be powered through the boost converter. Flash LEDs are
controlled basically the same way as RGB LEDs controlling
is previously described. Additional safety mode is introduced
for FLASH LED driving to avoid prolonged flash and damage
to application. FLASH can be done in 3 different ways:
1.
Using external PWM control
2.
Controlling RGB max current register values
3.
Using Flash mode
1. Using External PWM control
In this case pre-flash brightness is adjusted by adjusting the
pulse width of PWM signal
Enable external PWM pin by writing EN_PWM_PIN bit
high
Use EN_EXT_R_PWM, EN_EXT_G_PWM and EN-
_EXT_B_PWM bits to select, which LED outputs are
controlled by the external PWM control. Output which
external PWM control is not selected will be on constantly
regardless of the state of the external PWM pin.
Enable RGB constant current mode, if external ballast
resistors are not used (CC_SW = 0)
Disable internal RGB PWM mode (RGB_PWM = 0)
Write wanted maximum current values for each output to
RGB max current register (e.g. 11b for maximum current)
Enable RGB functions (EN_RGB = 1, RSW= 1, GSW= 1,
BSW = 1)
Use external PWM control pin (GPIO[0]/PWM) to intro-
duce pre-flash and flash.
20179702
Using External PWM Control for Flash
2. Controlling RGB Max Current Register Values
In this case pre-flash brightness is adjusted by adjusting the
current values in the RGB max current register. Note that in
this mode flash control speed and timing depends on the I
2
C
communication speed.
Enable RGB functions and disable PWM mode (EN-
_RGB = 1, RGB_PWM = 0)
Enable RGB constant current mode (CC_SW = 0)
Write pre-flash values for each output to RGB max cur-
rent register (e.g. 00b for 25% of maximum current)
Start pre-flash by switching on the LEDs (RSW = 1, GSW
= 1, BSW = 1). Pre-flash brightness can be adjusted also
by setting on only one or two LEDs during the pre-flash
Start flash by writing each output maximum current val-
ues to RGB max current register
Stop flash by switching off the LEDs (RSW = 0, GSW = 0,
BSW = 0)
L
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LP5526TLX/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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
LP5527 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization
LP55271 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization
LP55271TL 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization
LP55271TL/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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
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