参数资料
| 型号： | EL7585AILZ |
| 厂商： | Intersil |
| 文件页数： | 9/19页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY TFT-LCD 20-QFN |
| 标准包装： | 90 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 3 V ~ 5 V |
| 输出数： | 4 |
| 输出电压： | 5.5 V ~ 20 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
EL7585A
A VDD = --------------------- × V REF
A VDD 1
V IN
I OMAX = ? I LMT – -------- L ? × ---------
V O
? I L = --------- × -----
f S
Boost Converter
The main boost converter is a current mode PWM converter at
a fixed frequency of 1MHz which enables the use of low profile
inductors and multilayer ceramic capacitors. This results in a
compact, low cost power system for LCD panel design.
The EL7585A is 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:
---------------- = -------------
1 – D
Where D is the duty cycle of the switching MOSFET.
Figure 19 shows the block diagram of the boost regulator. 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:
R 1 + R 2
R 1
The current through the MOSFET is limited to 3.5A peak.
This restricts the maximum output current based on the
following equation:
? I V IN
? 2 ?
Where ? IL is peak to peak inductor ripple current, and is set by:
V IN D
L
where f S is the switching frequency.
SHUTDOWN
& START-UP
Ifb
SLOPE
COMPENSATION
CURRENT
CLOCK
CONTROL
Iref
AMPLIFIER
PWM
LOGIC
LX
BUFFER
Ifb
FBB
GM
AMPLIFIER
REFERENCE
GENERATOR
CINT
VOLTAGE
AMPLIFIER
Iref
PGND
FIGURE 19. BLOCK DIAGRAM OF THE BOOST REGULATOR
9
FN7523.3
March 9, 2006
相关PDF资料 |
PDF描述 |
|---|---|
| AVS107M25E16B-F | CAP ALUM 100UF 25V 20% SMD |
| AHA476M35E16B-F | CAP ALUM 47UF 35V 20% SMD |
| EL7584IRZ-T13 | IC CONV DC/DC 4-CHAN 24-TSSOP |
| AHA476M25E16B-F | CAP ALUM 47UF 25V 20% SMD |
| HMM24DRXH | CONN EDGECARD 48POS DIP .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EL7585AILZ-T13 | 功能描述:IC POWER SUPPLY TFT-LCD 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| EL7585AILZ-T7 | 功能描述:IC POWER SUPPLY TFT-LCD 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| EL7585AP_06 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:TFT-LCD Power Supply |
| EL7585IL | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:TFT-LCD Power Supply |
| EL7585IL-T13 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:TFT-LCD Power Supply |
发布紧急采购，3分钟左右您将得到回复。