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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(dòng)器 |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 1313K |
| 代理商： | LP55281 |
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Functionality of RGB LED Outputs
(R1-4, G1-4, B1-4)
LP55281 has 4 sets of RGB/color LED outputs. Each set has
3 outputs, which can be controlled individually with a 6-bit
PWM control register. The pulsed current level for each LED
output is set with a single external resistor R
and a 2-bit
coarse adjustment bit for each LED output (see tables below).
Rx_IPLS[7:6] /
Gx_IPLS[7:6] /
Bx_IPLS[7:6]
Sink Current Pulse
(I
MAX
= 100*1.23/R
RGB
)
I
PLS
0.25*I
MAX
0.50*I
MAX
0.75*I
MAX
1.00*I
MAX
00
01
10
11
Rx_PWM[5:0] /
Gx_PWM[5:0] /
Bx_PWM[5:0]
000 000
000 001
Awerage Sink
Current
Pulse Ratio, %
0
0
1/63*I
PLS
2/63*I
PLS
...
1.6
000 010
...
3.2
...
111 110
62/63*I
PLS
63/63*I
PLS
98.4
111 111
100
Each RGB set must be enabled separately by setting EN_RG-
Bx bit to '1'. Note, that the device must be enabled (NSTBY =
'1') before the RGB outputs can be activated.
When any of EN_RGBx bits are set to '1' and NSTBY = '1',
the RGB driver takes a certain quiescent current from battery
even if all PWM control bits are '0'. The quiescent current is
dependent on R
resistor, and can be calculated from for-
mula I
R_RGB
= 1.23V/R
RGB
.
PWM CONTROL TIMING
PWM frequency can be selected from 3 predefined values:
10 kHz, 20 kHz and 40 kHz. The frequency is selected with
FPWM1 and FPWM0 bits, see following table:
FPWM1
FPWM0
PWM Frequency (f
PWM
)
9.92 kHz
19.84 kHz
39.68 kHz
39.68 kHz
0
0
1
1
0
1
0
1
Each RGB set has equivalent internal PWM timing between
R, G and B: R has a fixed start time, G has a fixed midpulse
time and B has a fixed pulse end time. PWM start time for
each RGB set is different in order to minimize the instanta-
neous current loading due to the current sink switch on tran-
sition. See following timing diagram for details.
Timing Diagram
20201117
13
www.national.com
L
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(dòng)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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