參數(shù)資料
型號(hào)： LP3952RLX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 顯示驅(qū)動(dòng)器
英文描述： 6-Channel Color LED Driver with Audio Synchronization
中文描述： LED DISPLAY DRIVER, PBGA36
封裝： 3 X 3 MM, 0.65 MM HEIGHT, 0.50 MM PITCH, MICRO, SMD-36
文件頁(yè)數(shù)： 28/44頁(yè)
文件大小： 1621K
代理商： LP3952RLX
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 used. 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
1
The LP3952’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 rms current it will experience during circuit
operation. To get maximum (400 mA) current from the boost,
an inductor with 1A saturation current is recommended. If
output current is for example 200 mA then inductor with 600
mA saturation current can be used. 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. The induc-
tor should be connected to the SW pin as close to the IC as
possible. Examples of suitable inductor for 400 mA output
current is TDK VLF4012AT-4R7M1R1, and for 200mA appli-
cation VLF3010AT-4R7MR70 or Panasonic ELLVEG4R7N.
LIST OF RECOMMENDED EXTERNAL COMPONENTS
Symbol
C
VDD1
C
VDD2
C
VDDIO
C
VDDA
C
OUT
C
IN
L
1
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
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
4.7
Shielded, low ESR, Isat=1A for
400 mA output current,
Isat=600 mA for 200 mA output
current
Ceramic, X7R
C
VREF
C
VDDIO
R
RBG
R
RT
D
1
C
ASE
LEDs
C between V
REF
and GND
C between V
DDIO
and GND
R between I
RGB
and GND
R between I
RT
and GND
Rectifying Diode (Vf @ maxload)
100
nF
100
nF
k
Ω
k
Ω
V
Ceramic, X7R
5.6
±1%
82
±1%
0.3
Schottky diode
C between Audio input and ASE
100
nF
Ceramic, X7R / X5R
User defined
www.national.com
28
L
相關(guān)PDF資料
PDF描述
LP3952RL 6-Channel Color LED Driver with Audio Synchronization
LP39542 Zener Diode; Application: Low noise; Pd (mW): 250; Vz (V): 4.3 to 4.7; Condition Iz at Vz (mA): 0.5; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: LLD
LP39542RL Zener Diode; Application: Low noise; Pd (mW): 250; Vz (V): 4.6 to 5.0; Condition Iz at Vz (mA): 0.5; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: LLD
LP39542RLX Zener Diode; Application: Low noise; Pd (mW): 250; Vz (V): 4.9 to 5.3; Condition Iz at Vz (mA): 0.5; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: LLD
LP39542TL Advanced Lighting Management Unit
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LP3952RLX/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
LP3954 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Advanced Lighting Management Unit
LP39542 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Advanced Lighting Management Unit
LP39542RL 制造商:Texas Instruments 功能描述:IC, LIGHTING MGNT UNIT, SMD
LP39542RL/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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