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ACT6305_12 参数 Datasheet PDF下载

ACT6305_12图片预览
型号: ACT6305_12
PDF下载: 下载PDF文件 查看货源
内容描述: 低投入高效率同步升压型DC / DC转换器 [Low Input High Efficiency Synchronous Step-Up DC/DC Converter]
分类和应用: 转换器
文件页数/大小: 9 页 / 390 K
品牌: ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
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ACT6305  
Rev 3, 15-Nov-12  
Board Layout  
APPLICATIONS INFORMATION  
To reduce noise and increase efficiency, high cur-  
rent traces should be wide and direct, and an ex-  
tended ground plane should be used. Switching  
current paths should be laid out as tightly as possi-  
ble, with the inductor and input and output capaci-  
tors located close to the IC in order to reduce elec-  
tromagnetic radiation.  
Output Voltage Selection  
The ACT6305 provides fixed output voltage options  
of 3.3V or 5V, or the output voltage may be ad-  
justed over a 2V to 5V range by connecting an  
external resistive voltage divider. When Output Volt-  
age is set by external resistive voltage divider, add  
a 47pF to 150pFcapacitor as feedforward capacitor  
(CFF) as shown in Figure 1.  
If an external resistor divider is used, place the re-  
sistors very close to the FB and G pins, and keep  
them away from the high switching current paths.  
Table 1:  
Output Voltage Programming  
FB = OUT  
FB = G  
VOUT = 3.3V  
VOUT = 5V  
FB connect to resistive  
divider  
VOUT = 1.18V (1 + RFB1/RFB2)  
Figure 1:  
Output Voltage Setting  
VOUT  
OUT  
CFF  
ACT6305  
RFB1  
FB  
RFB2  
Output Capacitor Selection  
A minimum value of output capacitance is required  
to maintain loop stability and normal operation of  
the IC. The output capacitor value should be in the  
range of 22µF to 100µF. To obtain small output rip-  
ple, use a large capacitor with low ESR. Ceramic  
capacitors should be used for highest performance.  
If a tantalum capacitor is used, choose only low  
ESR types and a smaller low ESR capacitor of  
about 1µF can be connected in parallel to filter high  
frequency noise.  
Inductor Selection  
For most applications, the inductor value should be  
in the range of 4.7µH to 22µH. Smaller inductors  
provide faster load transient response and have a  
smaller physical size, but they also result in higher  
ripple current and reduce the maximum available  
output current. Choose inductors with low series  
resistance to obtain the highest efficiency.  
Innovative PowerTM  
- 8 -  
www.active-semi.com  
Copyright © 2012 Active-Semi, Inc.