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| 型号： | AN-9008 |
| 厂商： | Fairchild Semiconductor Corporation |
| 元件分类： | 圆形连接器 |
| 英文描述： | Circular Connector; No. of Contacts:37; Series:MS27656; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No |
| 中文描述： | 在一个反激变换器使用QFETs |
| 文件页数： | 5/9页 |
| 文件大小： | 124K |
| 代理商： | AN-9008 |
5
Rev D, July 2000
Figure 5 compares the waveforms of a conventional MOSFET with the new QFET(FQP7N60) at
turn-off without the additional clamped circuit (R5, C6, and D2), and the high conduction diode (D4)
for gate discharging (refer to Figure 3).
Figure 5: Turn-off Improvement at Rated Conditions (V
in
=220VAC, P
out
=60W)
Note that the switching time of the QFET is faster than that of the conventional MOSFET because
of the reduction of gate charge by at least 45 percent. Figure 6 shows the difference in turn-off loss
between both MOSFETs without clamped circuits and the conduction diode, D4. The turn-on loss
in the crossover losses is very small and can be negligible. The turn-off loss period is due to the
finite switching time of the MOSFET which is directly related to the gate charge.
Figure 6: Turn-off Loss Improvement
Conventional
MOSFET
QFET
Id(0.5A/div)
Vds(100V/div)
/div
Conventional
MOSFET
QFET
/div
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