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A7330MP8R 参数 Datasheet PDF下载

A7330MP8R图片预览
型号: A7330MP8R
PDF下载: 下载PDF文件 查看货源
内容描述: [DC-DC CONVERTER BUCK SENSORLESS CC/CV]
分类和应用: DC-DC转换器
文件页数/大小: 14 页 / 304 K
品牌: AITSEMI [ AiT Semiconductor ]
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A7330  
DC-DC CONVERTER BUCK (STEP-DOWN)  
SENSORLESS CC/CV  
AiT Semiconductor Inc.  
www.ait-ic.com  
Inductor Selection  
The inductor maintains a continuous current to the output load. This inductor current has a ripple that is  
dependent on the inductance value.  
Higher inductance reduces the peak-to-peak ripple current. The trade off for high inductance value is the  
increase in inductor core size and series resistance, and the reduction in current handling capability. In  
general, select an inductance value L based on ripple current requirement:  
VOUT x (VIN VOUT)  
L =  
VIN xSW x ILOADMAX x KRIPPLE  
Where VIN is the input voltage, VOUT is the output voltage, fSW is the switching frequency, ILOADMAX is the  
maximum load current, and KRIPPLE is the ripple factor. Typically, choose KRIPPLE=30% to correspond to the  
peak-to-peak ripple current being 30% of the maximum load current.  
With a selected inductor value the peak-to-peak inductor current is estimated as:  
V
OUT x (VIN VOUT)  
ILPK-PK  
=
V
IN x SW xL  
The peak inductor current is estimated as:  
1
2
ILPK = ILOADMAX  
+
ILPK-PK  
The selected inductor should not saturate at ILPK  
.
The maximum output current is calculated as:  
1
2
IOUTMAX = ILIM  
-
ILPK-PK  
ILIM is the internal current limit, which is typically 5.4A, as shown in Electrical Characteristics Table.  
REV1.0  
- JAN 2016 RELEASED -  
- 8 -