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参数资料
| 型号： | AD5254BRUZ50-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/32页 |
| 文件大小： | 0K |
| 描述： | IC POT DGTL QUAD 50K 20TSSOP |
| 标准包装： | 1,000 |
| 接片： | 256 |
| 电阻（欧姆）： | 50k |
| 电路数： | 4 |
| 温度系数： | 标准值 650 ppm/°C |
| 存储器类型： | 非易失 |
| 接口： | I²C（设备位址） |
| 电源电压： | 2.7 V ~ 5.5 V，±2.25 V ~ 2.75 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 带卷 (TR) |
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AD5253/AD5254
Data Sheet
Rev. C | Page 26 of 32
APPLICATIONS INFORMATION
RGB LED BACKLIGHT CONTROLLER
FOR LCD PANELS
Because high power (>1 W) RGB LEDs offer superior color
quality compared with cold cathode florescent lamps (CCFLs)
as backlighting sources, it is likely that high-end LCD panels
will employ RGB LEDs as backlight 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 of the forward voltage. To increase
the 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 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
AD5254, a boost regulator, an op amp, and power MOSFETs.
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
Resistor R2 to Resistor R4. For example, by adjusting the
AD5254’s RDAC0, the desirable voltage appears across the
sense resistors, RR. 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
V
I =
(8)
R8 is needed to prevent oscillation.
In addition to the 256 levels of adjustable current/brightness,
users can also apply a PWM signal at U3’s SD pin to achieve
finer brightness resolution or better power efficiency.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD5254EVAL | 制造商:Analog Devices 功能描述:EVAL BOARD FOR AD5254 - Bulk |
| AD5255 | 制造商:AD 制造商全称:Analog Devices 功能描述:3-Channel Digital Potentiometer with Nonvolatile Memory |
| AD5255BRU25 | 制造商:Analog Devices 功能描述:DGTL POTENTIOMETER 512POS 25KOHM TRIPLE 24TSSOP - Rail/Tube |
| AD5255BRU250 | 制造商:Analog Devices 功能描述:DGTL POTENTIOMETER 512POS 250KOHM TRIPLE 24TSSOP - Rail/Tube |
| AD5255BRU250-RL7 | 制造商:Analog Devices 功能描述:DGTL POTENTIOMETER 512POS 250KOHM TRIPLE 24TSSOP - Tape and Reel |
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