参数资料
| 型号： | EL7641ILTZ |
| 厂商： | Intersil |
| 文件页数： | 10/19页 |
| 文件大小： | 0K |
| 描述： | IC BOOST REG DC/DC TFT-LCD 32QFN |
| 标准包装： | 60 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.6 V ~ 5.5 V |
| 输出数： | 1 |
| 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： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 散装 |
EL7640, EL7641, EL7642
V REF
REFERENCE
GENERATOR
OSCILLATOR
SLOPE
COMPENSATION
COMP
OSC
PWM
LX
Σ
LOGIC
CONTROLLER
BUFFER
FBB
GM
VOLTAGE
AMPLIFIER
AMPLIFIER
C INT
UVLO
COMPARATOR
CURRENT
AMPLIFIER
CURRENT
CURRENT REF
PGND
LIMIT COMPARATOR
SS
THERMAL
SHUTDOWN
SHUTDOWN
& START-UP
CONTROL
V REF
+
-
BUFFER
DRVP
FBP
UVLO
COMPARATOR
SS
DRVN
+
-
0.2V
BUFFER
FBN
0.4V
UVLO
COMPARATOR
FIGURE 17. BLOCK DIAGRAM
V BOOST 1
V IN
V BOOST = --------------------- × V REF
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 EL7640, EL7641,
EL7642 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:
------------------------ = -------------
1 – D
Where D is the duty cycle of switching MOSFET.
10
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:
R 1 + R 2
R 1
FN7415.2
February 22, 2006
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EL7641ILTZ-T13 | 功能描述:直流/直流开关调节器 EL7641ILTZ TFT-LCD D DC-DC W/INTEGRTD AMP RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| EL7641ILTZ-T7 | 功能描述:直流/直流开关调节器 EL7641ILTZ TFT-LCD D DC-DC W/INTEGRTD AMP RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| EL7642 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:TFT-LCD DC/DC with Integrated Amplifiers |
| EL7642AILTZ | 功能描述:LCD 驱动器 EL7642AILTZ TFT-LCD DC-DC W/INTEGRTD AMP RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| EL7642AILTZ-T13 | 功能描述:LCD 驱动器 EL7642AILTZ TFT-LCD DC-DC W/INTEGRTD AMP RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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