参数资料
| 型号： | EL7520ILZ-T13 |
| 厂商： | Intersil |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR DC/DC 4-CHAN 20-QFN |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
EL7520, EL7520A
V REF
REFERENCE
GENERATOR
OSCILLATOR
V IN
SLOPE
COMPENSATION
OSC
V BOOST
Σ
PWM
LOGIC
CONTROLLER
BUFFER
DRVB
VOLTAGE
GM
AMPLIFIER
AMPLIFIER
CURRENT
AMPLIFIER
I SIN
UVLO
COMPARATOR
SHUTDOWN
& STARTUP
CONTROL
CURRENT LIMIT
COMPARATOR
CURRENT
LIMIT REF
GENERATOR
I SAD
FIGURE 25. FUNCTION DIAGRAM OF THE BOOST CONTROLLER
The internal current limit circuitry is shown in Figure 26. The
circuit senses the voltage across the R DS(ON) when the
MOSFET is on; then compare it to the internal voltage
reference to realize the current limit. The internal voltage
V DD
10μA
I SIN
LX
reference is generated by a 10μA current and any additional
? V ISAD ?
V THRESHOLD = ? ? × 8K
current set at I SAD pin flowing through an 8k ? resistor. The
voltage reference is based on the following equation:
----------------- + 10 μ A
? R 1 ?
V REF
I SAD
1K
8K
-
+
LOGIC
CONTROLLER
DRVB
Where V ISAD is the voltage at pin I SAD .
R 1
V ISAD = V REF – V BE – 1K × I SAD
FIGURE 26. CURRENT LIMIT BLOCK DIAGRAM
I SAD = -----------------
I OMAX = ? --------------------------------------- – -------- ? × ---------
R DSON
V O
2 ?
? I L = --------- × -----
f S
V O – V IN
V ISAD
R1
Where V BE ≈ 0.7V
The external resistor R 1 should be chosen in the order of
100K to generate μA of current.
11
Hence the maximum output current is determined by the
following equation:
? V THRESHOLD ? I L V IN
?
Where ? I L is the peak to peak inductor ripple current, and is
set by:
V IN D
L
f S is the switching frequency; D is the duty cycle.
D = ------------------------
V O
FN7318.0
July 12, 2005
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| EL7530IL | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Monolithic 600mA Step-Down Regulator with Low Quiescent Current |
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