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C3216X5R1E226M 参数 Datasheet PDF下载

C3216X5R1E226M图片预览
型号: C3216X5R1E226M
PDF下载: 下载PDF文件 查看货源
内容描述: 18V的驱动晶体管内置的同步降压型DC / DC转换器 [18V Driver Transistor Built-In Synchronous Step-Down DC/DC Converter]
分类和应用: 晶体转换器晶体管驱动
文件页数/大小: 21 页 / 571 K
品牌: TOREX [ Torex Semiconductor ]
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XC9248 Series  
TYPICAL APPLICATION CIRCUIT (Continued)  
<VOUT setting>  
The output voltage can be set by connecting external dividing resistors. The output voltage is determined by the values of RFB1  
and RFB2 as given in the equation below. The total of RFB1 and RFB2 should be less than 150k. Output voltage range can be  
set freely from 1.0V to 12V with a 0.8V reference voltage.  
VOUT=0.8×(RFB1+RFB2)/RFB2  
Adjust the value of the phase compensation speed-up capacitor CFB so that fzfp=1 / (2 × π × CFB x RFB1) is about 7kHz.  
Adjustments are required from 5kHz to 50kHz depending on the application, value of inductance (L), and value of load  
capacitance (CL).  
Examples】  
RFB1=47k, RFB2=15k, VOUT=0.8V×(47k+15k) /15k=3.3V  
CFB=470pF, fzfb=1/(2×π×470pF×47k)=7.2kHz  
< Minimum VOUT  
>
The Minimum VOUT is set by MINDUTY. The MINDUTY changes by the external inductance(L).  
For the L value, please choose the optimal value – see P.7 <Coil current setting>. The Minimum VOUT can be calculated by  
using the following equation:  
VOUT= VIN × MINDUTY / 100  
L vs. MINDUTY】  
L[μH]  
MINDUTY[%]  
2.2  
3.3  
4.7  
6.8  
10  
18  
20  
21  
21  
22  
<External soft-start setting>  
A capacitor can be connected to the SS pin to set a time longer than the internal soft-start time voluntarily.  
By setting the EN pin to the VENH voltage or higher, a current ISS=4μA (TYP.) flows to the SS pin and charges the capacitor.  
When the SS pin voltage attains the SS threshold voltage VSSTH=1.8V (TYP.), the output voltage reaches about 90% of the set voltage.  
External soft-start can be calculated by using the following equation:  
External soft-start time=VSSTH × CSS / ISS  
Examples】  
CSS=0.1μF, External soft-start time=1.8V × 0.1μF / 4μA × 1000=45ms  
2000ms  
450ms  
200ms  
45ms  
20ms  
4.5ms  
0.01  
0.047  
0.1  
0.47  
1
4.7  
μF  
μF  
μF  
μF  
μF  
μF  
CSS  
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