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参数资料
| 型号： | AD5254BRU1 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 数字电位计 |
| 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, 256 POSITIONS, PDSO20 |
| 封装： | MO-153AC, TSSOP-20 |
| 文件页数： | 25/28页 |
| 文件大小： | 834K |
| 代理商： | AD5254BRU1 |
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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.
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PDF描述 |
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| AD5254BRU1-RL7 | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| AD5254BRU10 | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| AD5254BRU10-RL7 | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| AD5254BRU100 | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| AD5254BRU100-RL7 | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD5254BRU10 | 功能描述:IC DGTL POT QUAD 10K I2C 20TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR) |
| AD5254BRU100 | 功能描述:IC DGTL POT QUAD 100K 20-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR) |
| AD5254BRU100-RL7 | 功能描述:IC DGTL POT QUAD 100K 20-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR) |
| AD5254BRU10-RL7 | 功能描述:IC DGTL POT QUAD 10K 20-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR) |
| AD5254BRU1-RL7 | 功能描述:IC DGTL POT QUAD 1K 20-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR) |
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