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参数资料
| 型号： | IRF3704ZL |
| 厂商： | International Rectifier |
| 英文描述： | HEXFET Power MOSFET |
| 中文描述： | HEXFET功率MOSFET |
| 文件页数： | 8/12页 |
| 文件大小： | 308K |
| 代理商： | IRF3704ZL |
8
www.irf.com
Control FET
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#
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P
loss
= P
conduction
+ P
switching
+ P
drive
+ P
output
This can be expanded and approximated by;
(
)
P
loss
=
I
rms
2
×
R
ds(on)
+
I
×
Q
gd
(
i
g
×
V
in
×
f
+
I
×
Q
gs2
i
g
×
V
in
×
f
+
Q
g
×
V
g
×
f
)
+
Q
oss
2
×
V
in
×
f
"(
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"
)
#
*
%+
%& !"#
# ,
-
./
#
#
#
Synchronous FET
The power loss equation for Q2 is approximated
by;
P
loss
=
P
conduction
+
P
drive
+
P
output
(
+
Q
g
×
V
g
×
f
(
Q
oss
2
*
P
loss
=
I
rms
2
×
R
ds(on)
)
+
×
V
in
×
f
+
Q
rr
×
V
in
×
f
(
)
*dissipated primarily in Q1.
For the synchronous MOSFET Q2, R
is an im-
portant characteristic; however, once again the im-
portance of gate charge must not be overlooked since
it impacts three critical areas. Under light load the
MOSFET must still be turned on and off by the con-
trol IC so the gate drive losses become much more
significant. Secondly, the output charge Q
and re-
verse recovery charge Q
both generate losses that
are transfered to Q1 and increase the dissipation in
that device. Thirdly, gate charge will impact the
MOSFETs’ susceptibility to Cdv/dt turn on.
The drain of Q2 is connected to the switching node
of the converter and therefore sees transitions be-
tween ground and V
. As Q1 turns on and off there is
a rate of change of drain voltage dV/dt which is ca-
pacitively coupled to the gate of Q2 and can induce
a voltage spike on the gate that is sufficient to turn
the MOSFET on, resulting in shoot-through current .
The ratio of Q
/Q
must be minimized to reduce the
potential for Cdv/dt turn on.
Power MOSFET Selection for Non-Isolated DC/DC Converters
Figure A: Q
oss
Characteristic
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|---|---|
| IRF3704ZS | HEXFET Power MOSFET |
| IRF3707LPBF | HEXFET Power MOSFET |
| IRF3707PBF | HEXFET Power MOSFET |
| IRF3707SPBF | HEXFET Power MOSFET |
| IRF3708LPBF | SMPS MOSFET HEXFET㈢Power MOSFET |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IRF3704ZLHR | 制造商:International Rectifier 功能描述:TRANS MOSFET N-CH 20V 67A 3PIN TO-262 - Bulk |
| IRF3704ZLPBF | 功能描述:MOSFET 20V 1 N-CH HEXFET 7.9mOhms 8.7nC RoHS:否 制造商:STMicroelectronics 晶体管极性:N-Channel 汲极/源极击穿电压:650 V 闸/源击穿电压:25 V 漏极连续电流:130 A 电阻汲极/源极 RDS（导通）:0.014 Ohms 配置:Single 最大工作温度: 安装风格:Through Hole 封装 / 箱体:Max247 封装:Tube |
| IRF3704ZPBF | 功能描述:MOSFET MOSFT 20V 67A 7.9mOhm 8.7nC Qg RoHS:否 制造商:STMicroelectronics 晶体管极性:N-Channel 汲极/源极击穿电压:650 V 闸/源击穿电压:25 V 漏极连续电流:130 A 电阻汲极/源极 RDS（导通）:0.014 Ohms 配置:Single 最大工作温度: 安装风格:Through Hole 封装 / 箱体:Max247 封装:Tube |
| IRF3704ZS | 制造商:IRF 制造商全称:International Rectifier 功能描述:HEXFET Power MOSFET |
| IRF3704ZSPBF | 功能描述:MOSFET 20V 1 N-CH HEXFET 11.1mOhms 8.7nC RoHS:否 制造商:STMicroelectronics 晶体管极性:N-Channel 汲极/源极击穿电压:650 V 闸/源击穿电压:25 V 漏极连续电流:130 A 电阻汲极/源极 RDS（导通）:0.014 Ohms 配置:Single 最大工作温度: 安装风格:Through Hole 封装 / 箱体:Max247 封装:Tube |
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