- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄295878 > EL7642AILTZ-T13 (INTERSIL CORP) TFT-LCD DC/DC with Integrated Amplifiers PDF資料下載
參數(shù)資料
| 型號： | EL7642AILTZ-T13 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | TFT-LCD DC/DC with Integrated Amplifiers |
| 中文描述： | 0.15 A SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, MO-220, QFN-32 |
| 文件頁數(shù)： | 2/19頁 |
| 文件大?。?/td> | 458K |
| 代理商： | EL7642AILTZ-T13 |
10
FN6270.0
May 15, 2006
FIGURE 17. BLOCK DIAGRAM
Boost Converter
The main boost converter is a current mode PWM converter
operating at a fixed frequency. The 1.2MHz switching
frequency enables the use of low profile inductor and
multilayer ceramic capacitors, which results in a compact,
low cost power system for LCD panel design.
The boost converter can operate in continuous or
discontinuous inductor current mode. The EL7640A,
EL7641A, EL7642A are designed for continuous current
mode, but they can also operate in discontinuous current
mode at light load. In continuous current mode, current flows
continuously in the inductor during the entire switching cycle
in steady state operation. The voltage conversion ratio in
continuous current mode is given by:
Where D is the duty cycle of switching MOSFET.
Figure 18 shows the block diagram of the boost controller.
It uses a summing amplifier architecture consisting of GM
stages for voltage feedback, current feedback and slope
compensation. A comparator looks at the peak inductor
current cycle by cycle and terminates the PWM cycle if the
current limit is reached.
An external resistor divider is required to divide the output
voltage down to the nominal reference voltage. Current
drawn by the resistor network should be limited to maintain
the overall converter efficiency. The maximum value of the
resistor network is limited by the feedback input bias current
and the potential for noise being coupled into the feedback
pin. A resistor network in the order of 60k
is recommended.
The boost converter output voltage is determined by the
following equation:
Σ
PWM
LOGIC
CONTROLLER
BUFFER
OSCILLATOR
SLOPE
COMPENSATION
OSC
REFERENCE
GENERATOR
VREF
GM
AMPLIFIER
UVLO
COMPARATOR
VOLTAGE
AMPLIFIER
CURRENT
AMPLIFIER
THERMAL
SHUTDOWN
SS
+
-
UVLO
COMPARATOR
BUFFER
UVLO
COMPARATOR
SS
+
-
SHUTDOWN
& START-UP
CONTROL
BUFFER
FBP
DRVP
FBB
CINT
DRVN
FBN
0.4V
0.2V
VREF
COMP
CURRENT
LIMIT COMPARATOR
CURRENT REF
PGND
LX
VBOOST
VIN
------------------------
1
1D
–
-------------
=
VBOOST
R1 R2
+
R1
---------------------
VREF
×
=
EL7640A, EL7641A, EL7642A
相關PDF資料 |
PDF描述 |
|---|---|
| EL7642AILTZ-T7 | TFT-LCD DC/DC with Integrated Amplifiers |
| EL7900ILCZ-T7 | Ambient Light Photo Detect IC |
| EL8170IS | microPower, Single-Supply, CMOS Instrumentation Amplifier |
| ELEKE222JA | 1 ELEMENT, 2200 uH, GENERAL PURPOSE INDUCTOR |
| ELEKN183KA | 1 ELEMENT, 18000 uH, GENERAL PURPOSE INDUCTOR |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| EL7642AILTZ-T7 | 功能描述:LCD 驅(qū)動器 EL7642AILTZ TFT-LCD DC-DC W/INTEGRTD AMP RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| EL7642ILTZ | 功能描述:直流/直流開關調(diào)節(jié)器 EL7642ILZ TFT-LCD DC -DC W/INTEGRTD AMP RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7642ILTZ-T13 | 功能描述:直流/直流開關調(diào)節(jié)器 EL7642ILTZ TFT-LCD D C-DC W/INTEGRTD AMP RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7642ILTZ-T7 | 功能描述:直流/直流開關調(diào)節(jié)器 EL7642ILTZ TFT-LCD D C-DC W/INTEGRTD AMP RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7661CN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC-100V FULL BRIDGE DRIVER |
發(fā)布緊急采購，3分鐘左右您將得到回復。