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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)： | 24/28頁 |
| 文件大?。?/td> | 1313K |
| 代理商： | LP55281 |
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Recommended External
Components
OUTPUT CAPACITOR, C
OUT
:
The output capacitor C
directly affects the magnitude of
the output ripple voltage. In general, the higher the value of
C
, the lower the output ripple magnitude. Multilayer ce-
ramic capacitors with low ESR are the best choice. At the
lighter loads, the low ESR ceramics offer a much lower
V
ripple than the higher ESR tantalums of the same value.
At the higher loads, the ceramics offer a slightly lower V
ripple magnitude than the tantalums of the same value. How-
ever, the dv/dt of the V
ripple with the ceramics is much
lower than the tantalums under all load conditions. Capacitor
voltage rating must be sufficient, 10V or greater is recom-
mended.
Some ceramic capacitors, espesically those in small pack-
ages, exhibit a strong capacitance reduction with the in-
creased applied voltage. The capacitance value can fall to
below half of the nominal capacitance. Too low output capac-
itance will increase the noise and it can make the boost
converter unstable.
INPUT CAPACITOR, C
IN
:
The input capacitor C
directly affects the magnitude of the
input ripple voltage and to a lesser degree the V
ripple. A
higher value C
will give a lower V
ripple. Capacitor voltage
rating must be sufficient, 10V or greater is recommended.
OUTPUT DIODE, D
1
:
A Schottky diode should be used for the output diode. To
maintain high efficiency the average current rating of the
schottky diode shoulde be larger than the peak inductor cur-
rent (1A). Schottky diodes with a low forward drop and fast
switching speeds are ideal for increasing efficiency in portable
applications. Choose a reverse breakdown of the schottky
diode larger than the output voltage. Do not use ordinary rec-
tifier diodes, since slow switching speeds and long recovery
times cause the efficiency and the load regulation to suffer.
INDUCTOR, L:
The LP55281's high switching frequency enables the use of
the small surface mount inductor. A 4.7 μH shielded inductor
is suggested for 2 MHz operation, 10 μH should be used at 1
MHz. The inductor should have a saturation current rating
higher than the peak current it will experience during circuit
operation
(~1A)
. Less than 300 m
ESR is suggested for high
efficiency. Open core inductors cause flux linkage with circuit
components and interfere with the normal operation of the
circuit. This should be avoided. For high efficiency, choose an
inductor with a high frequency core material such as ferrite to
reduce the core losses. To minimize radiated noise, use a
toroid, pot core or shielded core inductor. The inductor should
be connected to the SW pin as close to the IC as possible.
Recommended inductors are LPS3015 and LPS4012 from
Coilcraft and VLF4012 from TDK.
LIST OF RECOMMENDED EXTERNAL COMPONENTS
Symbol
C
V
DD1
C
V
DD2
C
V
DDIO
C
V
DDA
C
OUT
C
IN
L
BOOST
C
VREF
C
V
DDIO
R
RGB
R
RT
D
1
C
ASE
LEDs
Symbol explanation
C between V
DD1
and GND
C between V
DD2
and GND
C between V
DDIO
and GND
C between V
DDA
and GND
C between FB and GND
Value
100
Unit
nF
Type
Ceramic, X7R/X5R
100
nF
Ceramic, X7R/X5R
100
nF
Ceramic, X7R/X5R
1
μF
Ceramic, X7R/X5R
10
μF
Ceramic, X7R/X5R
C between battery voltage and GND
10
μF
Ceramic, X7R/X5R
L between SW and VBAT at 2 MHz
4.7
μH
Shielded, low ESR, I
SAT
1A
Ceramic, X7R
C between VREF and GND
100
nF
C between V
DDIO
and GND
R between IRGB and GND
100
nF
Ceramic, X7R
8.2
k
k
V
±1%
R between IRT and GND
82
±1%
Rectifying Diode (V
f
@ maxload)
C between Audio input and ASEx
0.3
Schottky diode
100
nF
Ceramic, X7R/X5R
User defined
www.national.com
24
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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