參數(shù)資料
型號(hào)： LP39542TL
廠(chǎng)商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 顯示驅(qū)動(dòng)器
英文描述： Advanced Lighting Management Unit
中文描述： LED DISPLAY DRIVER, PBGA36
封裝： 3 X 3 MM, 0.60 MM HEIGHT, 0.50 MM PITCH, MICRO, SMD-36
文件頁(yè)數(shù)： 35/58頁(yè)
文件大小： 2547K
代理商： LP39542TL
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 Vout
ripple that the higher ESR tantalums of the same value. At the
higher loads, the ceramics offer a slightly lower Vout ripple
magnitude than the tantalums of the same value. However,
the dv/dt of the Vout ripple with the ceramics is much lower
than the tantalums under all load conditions. Capacitor volt-
age rating must be sufficient, 10V or greater is recommended.
Some ceramic capacitors, especially those in small pack-
ages, exhibit a strong capacitance reduction with the
increased applied DC voltage, so called DC bias effect.
The capacitance value can fall to below half of the nom-
inal capacitance. Too low output capacitance will in-
crease noise and it can make the boost converter
unstable. Recommended maximum DC bias effect at 5V
DC voltage is -50%.
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. Peak
repetitive current rating of the schottky diode should be larger
than the peak inductor current (ca. 1A). Average current rating
of the schottky diode should be higher than maximum output
current (400 mA). 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 or-
dinary rectifier diodes, since slow switching speeds and long
recovery times cause the efficiency and the load regulation to
suffer.
INDUCTOR, L
1
The LP39542’s high switching frequency enables the use of
the small surface mount inductor. A 4.7
μ
H shielded inductor
is suggested for 2 MHz operation, 10
μ
H 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
(ca. 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. Examples of suitable inductors are: TDK
VLF4012AT-4R7M1R1 and Panasonic ELLVEG4R7N.
LIST OF RECOMMENDED EXTERNAL COMPONENTS
Symbol
C
VDD1
C
VDD2
C
VDDIO
C
VDDA
C
OUT
C
IN
L
1
C
VREF
C
VDDIO
R
FLASH
R
RBG
R
RT
D
1
C
ASE
LEDs
D
LIGHT
Symbol explanation
C between VDD1 and GND
Value
100
Unit
nF
Type
Ceramic, X7R / X5R
C between VDD2 and GND
100
nF
Ceramic, X7R / X5R
C between VDDIO and GND
100
nF
μ
F
μ
F
μ
F
μ
H
nF
Ceramic, X7R / X5R
C between VDDA and GND
1
Ceramic, X7R / X5R
C between FB and GND
10
Ceramic, X7R / X5R, 10V
C between battery voltage and GND
10
Ceramic, X7R / X5R
L between SW and V
BAT
at 2 MHz
C between V
REF
and GND
C between V
DDIO
and GND
R between I
FLASH
and GND
R between I
RGB
and GND
R between I
RT
and GND
Rectifying Diode (Vf @ maxload)
4.7
Shielded, low ESR, Isat 1A
100
Ceramic, X7R
100
nF
k
Ω
k
Ω
k
Ω
V
Ceramic, X7R
1.2
±1%
5.6
±1%
82
±1%
0.3
Schottky diode
C between Audio input and ASE
100
nF
Ceramic, X7R / X5R
Light Sensor
User defined
TDK BSC2015
35
www.national.com
L
相關(guān)PDF資料
PDF描述
LP39542TLX Advanced Lighting Management Unit
LP3954 Advanced Lighting Management Unit
LP3954RL Advanced Lighting Management Unit
LP3954RLX Advanced Lighting Management Unit
LP3954TL Advanced Lighting Management Unit
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LP39542TL/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
LP39542TLX 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Advanced Lighting Management Unit
LP39542TLX/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
LP3954RL 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Advanced Lighting Management Unit
LP3954RL/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
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