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AN024 の電気的特性と機能

AN024のメーカーはAICです、この部品の機能は「For LCD Motherboard Power Supply」です。


製品の詳細 ( Datasheet PDF )

部品番号 AN024
部品説明 For LCD Motherboard Power Supply
メーカ AIC
ロゴ AIC ロゴ 




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AN024 Datasheet, AN024 PDF,ピン配置, 機能
AN024
For LCD Motherboard Power Supply Using AIC1563
Introduction
The newest technology of monitor is Flat-Panel Display
(FPD). In FPD field, the widest and most grow up
application is Liquid Crystal Display (LCD). It has many
advantages, such as: light weight, less space, low
voltage operating and power saving. They are very
attractive. Certainly, on the brightness, contrast and the
activity transient despondence of display, they can’t
compare with Cathode Ray Tube (CRT) monitor.
Fig. 1 shows the structure of LCD monitor (LCDM),
there are three main parts in it: motherboard, panel
and inverter. For normal working, LCD monitor needs a
good power management to get in. This application
note focus on the power design for the motherboard of
LCD. It needs 5V; 3.3V and 2.5V output voltage, which
depend on vender’s desire. This application note will
discuss the steps of design.
RGB
DVI
Video
ADC
TMDS
Deccoder
Source Driver
Key Pads
Scaler
MCU
EEPROM
OSD PLL
LCD Panel
Adaptor
LCD MB Power
Fig.1 LCD structure
LCD Panel Power
Inverter
February, 2002
1

1 Page





AN024 pdf, ピン配列
AN024
VIN
8~12VIN
R1
0.1
+ C1
470µF
8 BOOST DC 1
7 IS DE 2
6 VCC
CF 3
5 FB GND 4
AIC1563
C2
360pF
Q2
GF4435
R2
2.2K Q1
MMBT2222A
D1
LL4148
5VOUT/1A
VOUT
L1
47µH
D2 +
1N5820
C3
R3
470µF 3K
GND
R4
1k
D3
1N5401
D4
1N5401
3.3VOUT/1A N1
AIC1084-33CM
3.3VOUT/1A
3 VIN VOUT 2
GND
Q3
GF4410
1 + C4
470µF/6.3V
R5 1.2k
N14
2.5VOUT/1A
+ C5
R6 470µF/6.3V
N11
GND
N12
GND
UAI3C4313.9k
Fig. 2 The application circuit for the motherboard of LCD
DC 1
Q2
Q1
DE 2
80
QS
R
8 BOOST
7 IS
CF 3
GND 4
CT Is
Oscillator
1.25V
Reference
Voltage
Comparator
+
-
6
VCC
5
FB
Components Selection
Fig. 3 The block diagram of AIC1563.
(1). Current Limit Resistor (R1) Selection
The current limit resistor can be calculated by
following formula:
R1=0.3/ILIMIT
(1)
Since we need a 3A loading at least, the current
limit resistor should be R1=0.3/3A=0.1.
(2). Oscillator Timing Capacitor (CT) Selection
During the MOSFET turns on, the energy stores
in inductor should be (VIN-VOUT-VQ2,ON)*Ton,
where VQ2,on (0.475V) is the dropout voltage at
MOSFET (Q2) turns on. Similarly, during the
MOSFET turns off, the energy stores in inductor
should be (VOUT+VD2)*TOFF, where VD2 (0.75V) is
the forward voltage of the free-wheel diode D2.
According to the law of the conservation of
magnetic flux, the energy stored in inductor
should be the same at MOSFET turns on and off.
Therefore the relationship can be written as
(VIN- VOUT-VQ1,ON)*TON= (VOUT +VD2)*TOFF
(2)
and the duty cycle is
DUTY =
TON
T
=
VOUT + VD2
VIN VQ2,ON + VD2
= 69.49%
(3)
3


3Pages


AN024 電子部品, 半導体
Frequency Test
VIN=12V, CT=360pF.
Ripple Voltage Test
AN024
VIN=12V, VOUT=5.0V, IOUT=500mA
VIN=12V, VOUT=5.0V, IOUT=1A
VIN=12V, VOUT=5.0V, IOUT=2A
VIN=12V, VOUT=5.0V, IOUT=3A
6

6 Page



ページ 合計 : 7 ページ
 
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[ AN024 データシート.PDF ]


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