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IRF7805ATRPBF датащи(PDF) 4 Page - International Rectifier

номер детали IRF7805ATRPBF
подробное описание детали  N Channel Application Specific MOSFETs
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производитель  IRF [International Rectifier]
домашняя страница  http://www.irf.com
Logo IRF - International Rectifier

IRF7805ATRPBF датащи(HTML) 4 Page - International Rectifier

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IRF7805/IRF7805APbF
Figure 2: Q
oss Characteristic
For the synchronous MOSFET Q2, R
ds(on) is an im-
portant characteristic; however, once again the impor-
tance 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
oss and re-
verse recovery charge Q
rr 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
in. 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
gd/Qgs1 must be minimized to reduce the
potential for Cdv/dt turn on.
Spice model for IRF7805 can be downloaded in ma-
chine readable format at www.irf.com.


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