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120NH03L 参数 Datasheet PDF下载

120NH03L图片预览
型号: 120NH03L
PDF下载: 下载PDF文件 查看货源
内容描述: N沟道30V - 0.005ohm - 60A - TO-220 / D2PAK / I2PAK的STripFET功率MOSFET用于DC-DC转换 [N-channel 30V - 0.005ohm - 60A - TO-220 / D2PAK / I2PAK STripFET Power MOSFET for DC-DC conversion]
分类和应用:
文件页数/大小: 17 页 / 509 K
品牌: STMICROELECTRONICS [ ST ]
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Appendix A  
STB120NH03L - STI120NH03L - STP120NH03L  
6
Appendix A  
Figure 18. Buck converter: power losses estimation  
The power losses associated with the FETs in a synchronous buck converter can be  
estimated using the equations shown in the table below. The formulas give a good  
approximation, for the sake of performance comparison, of how different pairs of devices  
affect the converter efficiency. However a very important parameter, the working  
temperature, is not considered. The real device behavior is really dependent on how the  
heat generated inside the devices is removed to allow for a safer working junction  
temperature.  
The low side (SW2) device requires:  
Very low R  
to reduce conduction losses  
DS(on)  
Small Qgls to reduce the gate charge losses  
Small Coss to reduce losses due to output capacitance  
Small Qrr to reduce losses on SW1 during its turn-on  
The Cgd/Cgs ratio lower than Vth/Vgg ratio especially with low drain to source  
voltage to avoid the cross conduction phenomenon;  
The high side (SW1) device requires:  
Small Rg and Ls to allow higher gate current peak and to limit the voltage  
feedback on the gate  
Small Qg to have a faster commutation and to reduce gate charge losses  
Low R  
to reduce the conduction losses.  
DS(on)  
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