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參數(shù)資料
| 型號： | LP55281 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Quad RGB Driver |
| 中文描述： | 四RGB驅(qū)動器 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 1313K |
| 代理商： | LP55281 |
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ALED Driver
LP55281 has a single ALED driver. It is a constant current
sink with an 8-bit control. ALED driver can be used as a DC
current sink or an audio synchronized current sink. Note, that
when the audio synchronization function is enabled, the 8-bit
current control register has no effect.
ALED driver is enabled when audio synchronization is en-
abled (EN_SYNC = 1) or when ALED[7:0] control byte has
other than 00h value.
20201107
ADJUSTMENT OF ALED DRIVER
Adjustment of the ALED driver current (Register 0Ch) is de-
scribed in table below:
ALED[7:0]
Driver Current, mA
(typical)
0
0.06
0.1
...
14.8
14.9
15
0000 0000
0000 0001
0000 0010
...
1111 1101
1111 1110
1111 1111
With other than values on the table, the current value can be
calculated to be (15.0 mA / 255) * ALED[7:0], where ALED
[7:0] is value in decimals.
LED Test Interface
All LED pin voltages and boost output voltage in LP55281 can
be measured and value can be read through the SPI/I
2
C
compatible interface. MUX_LED[3:0] bits in the LED test reg-
ister (address 12h) are used to select one of the LED outputs
or boost output for measurement. The selected output is con-
nected to the internal ADC through a 55 k
resistor divider.
The AD conversion is activated by setting the EN_LTEST bit
to '1'. The first conversion is ready after 128 μs from this. The
result can be read from the ADC output register (address
13h). The device executes the AD conversions automatically
once in every 128 μs period, as long as the EN_LTEST bit is
'1'.
User can set the preferred DC current level with the LED driv-
er controls. The RGB drivers' PWM must be set to 100%, or
otherwise there can appear random variation on results. Note,
that the 55 k
resistor divider causes small additional current
through the LED under measurement.
ADC result can be converted into a voltage value (of the se-
lected pin) by multiplying the ADC result (in decimals) with
27.345 mV
(value of LSB). The calculated voltage value is the
voltage between the selected pin and ground. The internal
LDO voltage is used as a reference voltage for the conver-
sion. The accuracy of LDO is ± 3%, which is defining the
overall accuracy. The non-linearity and offset figures are both
better than 2LSB.
Principle of LED Connection to ADC
LED Multiplexing (Register 12h)
MUX_LED[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Connection
R1
G1
B1
R2
G2
B2
R3
G3
B3
R4
G4
B4
ALED
-
-
Boost Output
www.national.com
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LP55281RL | Quad RGB Driver |
| LP55281RLX | Quad RGB Driver |
| LP55281TL | Quad RGB Driver |
| LP55281TLX | Quad RGB Driver |
| LP5551 | PowerWise⑩ Technology Compliant Energy Management Unit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP55281RL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Quad RGB Driver |
| LP55281RL/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 |
| LP55281RLEV | 功能描述:LED 照明開發(fā)工具 LP55281RLEV EVAL BOARD RoHS:否 制造商:Fairchild Semiconductor 產(chǎn)品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝: |
| LP55281RLEV/NOPB | 制造商:Texas Instruments 功能描述:QUAD RGB DRIVER - Boxed Product (Development Kits) 制造商:Texas Instruments 功能描述:BOARD EVAL FOR LP5528 RGB DRIVER 制造商:Texas Instruments 功能描述:Quad RGB Drvr fr the PowerWise Family |
| LP55281RLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Quad RGB Driver |
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