- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373874 > AD5253BRU10 (ANALOG DEVICES INC) Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers PDF資料下載
參數(shù)資料
| 型號： | AD5253BRU10 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| 中文描述： | QUAD 10K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 64 POSITIONS, PDSO20 |
| 封裝： | MO-153AC, TSSOP-20 |
| 文件頁數(shù)： | 25/28頁 |
| 文件大?。?/td> | 834K |
| 代理商： | AD5253BRU10 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁當前第25頁第26頁第27頁第28頁
AD5253/AD5254
APPLICATIONS
RGB LED LCD BACKLIGHT CONTROLLER
High power (>1 W) RGB LEDs have been improved so
dramatically in efficiency and cost that they are likely to replace
CCFLs (cold cathode florescent lamps) as backlighting sources
in high end LCD panels in the near future. Unlike conventional
LEDs, high power LEDs have a forward voltage of 2 V to 4 V,
and consume more than 350 mA at maximum brightness. The
LED brightness is a linear function of the conduction current
but not the forward voltage. To increase brightness of a given
color, multiple LEDs can be connected in series, rather than in
parallel, to achieve uniform brightness. For example, three red
LEDs configured in series require an average of 6 V to 12 V
voltage headroom, but the circuit operation requires current
control. As a result, Figure 45 shows the implementation of one
high power RGB LED controller using a digital potentiometer
AD5254, a boost regulator, an op amp, and power MOSFETs.
Rev. 0 | Page 25 of 28
The ADP1610 (U2 in Figure 45) is an adjustable boost regulator
with its output adjusted by the AD5254’s RDAC3. Such an
output should be set high enough for proper operation but low
enough to conserve power. The ADP1610’s 1.2 V band gap
reference is buffered to provide the reference level for the
voltage dividers set by the AD5254’s RDAC0 to RDAC2 and
resistors R2 to R4. For example, by adjusting the AD5254’s
RDAC0, the desirable voltage appears across the sense resistors,
R
R
. If U2’s output is set properly, op amp U3A and power
MOSFET N1 do whatever is necessary to regulate the current of
the loop. As a result, the current through the sense resistor and
the red LEDs is
R
RR
R
R
V
I
=
(8)
R8 is needed to prevent oscillation.
In addition to the 256 levels of adjustable current/brightness,
users may also apply a PWM signal at U3’s SD pin to achieve
finer brightness resolution or better power efficiency.
相關PDF資料 |
PDF描述 |
|---|---|
| AD5253BRU10-RL7 | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| AD5253BRU100 | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| AD5253BRU100-RL7 | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| AD5253BRU50 | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| AD5253BRU50-RL7 | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD5253BRU100 | 功能描述:IC DGTL POT QUAD 100K 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標準包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標準值 300 ppm/°C 存儲器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應商設備封裝:8-TDFN（2x3） 包裝:帶卷 (TR) |
| AD5253BRU100-RL7 | 制造商:Analog Devices 功能描述:Digital Potentiometer 64POS 100KOhm Quad 20-Pin TSSOP T/R 制造商:Analog Devices 功能描述:DGTL POTENTIOMETER 64POS 100KOHM QUAD 20TSSOP - Tape and Reel |
| AD5253BRU10-RL7 | 功能描述:IC DGTL POT QUAD 10K 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標準包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標準值 300 ppm/°C 存儲器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應商設備封裝:8-TDFN（2x3） 包裝:帶卷 (TR) |
| AD5253BRU1-RL7 | 功能描述:IC DGTL POT QUAD 1K 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標準包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標準值 300 ppm/°C 存儲器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應商設備封裝:8-TDFN（2x3） 包裝:帶卷 (TR) |
| AD5253BRU50 | 功能描述:IC DGTL POT QUAD 50K 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標準包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數(shù):1 溫度系數(shù):標準值 300 ppm/°C 存儲器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應商設備封裝:8-TDFN（2x3） 包裝:帶卷 (TR) |
發(fā)布緊急采購，3分鐘左右您將得到回復。