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參數(shù)資料
| 型號(hào)： | STD55NH2LLT4 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | N-channel 24V - 0.010ohm - 40A - DPAK/IPAK Ultra low gate charge STripFET TM Power MOSFET |
| 中文描述： | N溝道24V的- 0.010ohm - 40A條-的DPAK /像是iPak超低柵極電荷STripFET商標(biāo)功率MOSFET |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大小： | 485K |
| 代理商： | STD55NH2LLT4 |
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STD55NH2LL - STD55NH2LL-1
Appendix A
9/16
4
Appendix A
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
DS(on)
to reduce conduction losses
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
DS(on)
to reduce the conduction losses.
●
●
●
●
●
●
●
●
●
●
●
Figure 19.
Buck converter: power losses estimation
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| STD560BLK | 功能描述:LED 安裝硬件 .2" DIA. .56" BLACK RoHS:否 制造商:Bivar 產(chǎn)品:LED Mounting Clips LED 大小:5 mm 材料:Nylon 顏色:Black 主體長(zhǎng)度:4.4 mm 面板厚度尺寸: 封裝:Bulk |
| STD570BLK | 功能描述:LED 安裝硬件 .2" DIA. .57" BLACK RoHS:否 制造商:Bivar 產(chǎn)品:LED Mounting Clips LED 大小:5 mm 材料:Nylon 顏色:Black 主體長(zhǎng)度:4.4 mm 面板厚度尺寸: 封裝:Bulk |
| STD58-0404 | 制造商:MEGGIT 功能描述:4 INCH TRANSVERSE PROBE (INCL. W/5080) 制造商:FW BELL 功能描述:TEST, ELECTROMAGNETIC FIELD; Test Probe Functions:Magnetic Field; For Use With:FW Bell 5080 Series Gaussmeters; Accuracy: 1%; Size:4" ;RoHS Compliant: NA |
| STD580BLK | 功能描述:LED 安裝硬件 .2" DIA. .58" BLACK RoHS:否 制造商:Bivar 產(chǎn)品:LED Mounting Clips LED 大小:5 mm 材料:Nylon 顏色:Black 主體長(zhǎng)度:4.4 mm 面板厚度尺寸: 封裝:Bulk |
| STD590BLK | 功能描述:LED 安裝硬件 .2" DIA. .59" BLACK RoHS:否 制造商:Bivar 產(chǎn)品:LED Mounting Clips LED 大小:5 mm 材料:Nylon 顏色:Black 主體長(zhǎng)度:4.4 mm 面板厚度尺寸: 封裝:Bulk |
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