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| 型号： | STB13NK60ZT4 |
| 厂商： | 意法半导体 |
| 英文描述： | N-CHANNEL 600V-0.48ohm-13A TO-220/FP/D2PAK/I2PAK/TO-247 Zener-Protected SuperMESH⑩Power MOSFET |
| 中文描述： | N沟道600V的0.48ohm - 13A条TO-220/FP/D2PAK/I2PAK/TO-247齐纳保护SuperMESH⑩功率MOSFET |
| 文件页数： | 9/11页 |
| 文件大小： | 410K |
| 代理商： | STB13NK60ZT4 |
9/11
STB130NH02L
SW1
SW2
APPENDIX A
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 rmoved to allow for a safer working junction
temperature.
The low side (
SW2
) device requires:
Very low R
DS(on)
to reduce conduction losses
Small Q
gls
to reduce the gate charge losses
Small C
oss
to reduce losses due to output capacitance
Small Q
rr
to reduce losses on SW
1
during its turn-on
The C
gd
/C
gs
ratio lower than V
th
/V
gg
ratio especially with low drain to source
voltage to avoid the cross conduction phenomenon;
The high side (
SW1)
device requires:
Small R
g
and L
s
to allow higher gate current peak an to limit the voltage
feedback on the gate
Small Q
g
to have a faster commutation and to reduce gate charge losses
Low R
DS(on)
to reduce the conduction losses.
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