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參數(shù)資料
| 型號： | AN-9008 |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 圓形連接器 |
| 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： | 在一個反激變換器使用QFETs |
| 文件頁數(shù)： | 2/9頁 |
| 文件大?。?/td> | 124K |
| 代理商： | AN-9008 |
2
Rev D, July 2000
:
Figure 1: Gate Charge Improvement
Balanced with gate charge improvement, the on-resistance [R
ds(on)
] goes down by about 20 per-
cent with respect to previous devices versus drain current. Figure 2 shows the improvement of on-
resistance in a QFET compared with a MOSFET.
Figure 2: On-resistance Improvement vs. Drain Current
The combined improvement of gate charge and on-resistance in this 60 watt flyback converter
leads to a more efficient system because of the reduced turn-off conduction loss. It is worth
emphasizing that QFETs offer designers significant improvements in terms of lower overall system
cost due to lower gate driver requirements, a smaller heat sink, and narrower PCB. Table 1 illus-
trates the features which are useful in flyback converters and other applications.
Table 1: Q
g
and R
ds(on)
Improvements
Voltage Rating
600V
600V
Device
On-resistance
1.2
1.0
Gate Charge
65 nC
38 nC
Package
TO-220
TO-220
Conventional Part
FQP7N60(QFET)
QFET
FQP7N60
1
2
3
4
5
6
7
0.70
0.75
0.80
0.85
0.90
0.95
1.00
1.05
1.10
Conventional MOSFET
QFET (FQP7N60)
O
(
]
Drain Current : Id [A]
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