參數(shù)資料
型號(hào)： AD5253BRU1-RL7
廠商： ANALOG DEVICES INC
元件分類： 數(shù)字電位計(jì)
英文描述： Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers
中文描述： QUAD 1K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 64 POSITIONS, PDSO20
封裝： MO-153AC, TSSOP-20
文件頁(yè)數(shù)： 25/28頁(yè)
文件大?。?/td> 834K
代理商： AD5253BRU1-RL7
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(guān)PDF資料
PDF描述
AD5253BRU10 Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers
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
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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(biāo)準(zhǔn)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(biāo)準(zhǔn)值 300 ppm/°C 存儲(chǔ)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(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR)
AD5253BRU50-RL7 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(biāo)準(zhǔn)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(biāo)準(zhǔn)值 300 ppm/°C 存儲(chǔ)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(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR)
AD5253BRUZ1 功能描述:IC POT DGTL QUAD 1K I2C 20TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)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(biāo)準(zhǔn)值 300 ppm/°C 存儲(chǔ)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(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR)
AD5253BRUZ10 功能描述:IC DGTL POT 64P 10K QUAD 20TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)包裝:3,300 系列:WiperLock™ 接片:257 電阻（歐姆）:100k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 150 ppm/°C 存儲(chǔ)器類型:易失 接口:3 線 SPI（芯片選擇） 電源電壓:1.8 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-VDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-DFN-EP（3x3） 包裝:帶卷 (TR)
AD5253BRUZ100 功能描述:IC POT DGTL QUAD 100K 20TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 標(biāo)準(zhǔn)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(biāo)準(zhǔn)值 300 ppm/°C 存儲(chǔ)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(yīng)商設(shè)備封裝:8-TDFN（2x3） 包裝:帶卷 (TR)
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