参数资料
| 型号： | EL7520ILZ |
| 厂商： | Intersil |
| 文件页数： | 10/18页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR DC/DC 4-CHAN 20-QFN |
| 标准包装： | 90 |
| 应用： | 控制器，TFT LCD |
| 输入电压： | 3 V ~ 5.5 V |
| 输出数： | 4 |
| 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） |
| 包装： | 管件 |
EL7520, EL7520A
V REF
REFERENCE
GENERATOR
OSCILLATOR
SLOPE
COMPENSATION
OSC
LX
FBB
GM
AMPLIFIER
VOLTAGE
AMPLIFIER
Σ
PWM
LOGIC
CONTROLLER
BUFFER
DRVB
I SIN
C INT
UVLO
COMPARATOR
CURRENT
AMPLIFIER
CURRENT LIMIT
COMPARATOR
CURRENT
LIMIT REF
GENERATOR
SS
I SAD
EN
SHUTDOWN
& STARTUP
CONTROL
V REF
+
-
DRVP
THERMAL
SHUTDOWN
SS
UVLO
COMPARATOR
SS
BUFFER
FBP
DRVN
+
-
0.2V
V REF
+
-
DRVL
FBN
BUFFER
0.4V
UVLO
COMPARATOR
UVLO
COMPARATOR
FIGURE 24. BLOCK DIAGRAM
BUFFER
FBL
V BOOST 1
------------------------ = -------------
V IN
V BOOST = --------------------- × V REF
Boost Converter
The main boost converter is a current mode PWM controller
operating at a fixed frequency. The 1MHz 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 EL7520 and
EL7520A 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 25 shows the function 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
FN7318.0
July 12, 2005
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EL7520ILZ-T13 | 功能描述:电流型 PWM 控制器 EL7520ILZ 4-CH DC-DC CNTRLR RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| EL7520ILZ-T7 | 功能描述:电流型 PWM 控制器 EL7520ILZ 4-CH DC-DC CNTRLR RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| EL7530 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Monolithic 600mA Step-Down Regulator with Low Quiescent Current |
| EL7530_06 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Monolithic 600mA Step-Down Regulator with Low Quiescent Current |
| EL7530EVAL1 | 功能描述:EVALUATION BOARD FOR EL7530 RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
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