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STD70N03L-1 датащи(PDF) 9 Page - STMicroelectronics

номер детали STD70N03L-1
подробное описание детали  N-channel 30V - 0.0059ohm - 70A - DPAK / IPAK STripFET TM III Power MOSFET
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STD70N03L - STD70N03L-1
Power losses estimation
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Appendix A
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 wotking 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 RDS(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 Lg 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 RDS(on) to reduce the conduction losses
Figure 19. Buck converter


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