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MTV6N100E 数据表(PDF) 5 Page - ON Semiconductor

部件名 MTV6N100E
功能描述  Power Field Effect Transistor
Download  11 Pages
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制造商  ONSEMI [ON Semiconductor]
网页  http://www.onsemi.com
标志 ONSEMI - ON Semiconductor

MTV6N100E 数据表(HTML) 5 Page - ON Semiconductor

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MTV6N100E
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5
POWER MOSFET SWITCHING
Switching behavior is most easily modeled and predicted
by recognizing that the power MOSFET is charge
controlled. The lengths of various switching intervals (Δt)
are determined by how fast the FET input capacitance can
be charged by current from the generator.
The published capacitance data is difficult to use for
calculating rise and fall because drain−gate capacitance
varies greatly with applied voltage. Accordingly, gate
charge data is used. In most cases, a satisfactory estimate
of average input current (IG(AV)) can be made from a
rudimentary analysis of the drive circuit so that
t = Q/IG(AV)
During the rise and fall time interval when switching a
resistive load, VGS remains virtually constant at a level
known as the plateau voltage, VSGP. Therefore, rise and fall
times may be approximated by the following:
tr = Q2 x RG/(VGG − VGSP)
tf = Q2 x RG/VGSP
where
VGG = the gate drive voltage, which varies from zero to VGG
RG = the gate drive resistance
and Q2 and VGSP are read from the gate charge curve.
During the turn−on and turn−off delay times, gate current is
not constant. The simplest calculation uses appropriate
values from the capacitance curves in a standard equation
for voltage change in an RC network. The equations are:
td(on) = RG Ciss In [VGG/(VGG − VGSP)]
td(off) = RG Ciss In (VGG/VGSP)
The capacitance (Ciss) is read from the capacitance curve
at a voltage corresponding to the off−state condition when
calculating td(on) and is read at a voltage corresponding to
the on−state when calculating td(off).
At high switching speeds, parasitic circuit elements
complicate the analysis. The inductance of the MOSFET
source lead, inside the package and in the circuit wiring
which is common to both the drain and gate current paths,
produces a voltage at the source which reduces the gate
drive current. The voltage is determined by Ldi/dt, but since
di/dt is a function of drain current, the mathematical solution
is complex. The MOSFET output capacitance also
complicates the mathematics. And finally, MOSFETs have
finite internal gate resistance which effectively adds to the
resistance of the driving source, but the internal resistance
is difficult to measure and, consequently, is not specified.
The resistive switching time variation versus gate
resistance (Figure 9) shows how typical switching
performance is affected by the parasitic circuit elements. If
the parasitics were not present, the slope of the curves
would maintain a value of unity regardless of the switching
speed. The circuit used to obtain the data is constructed to
minimize common inductance in the drain and gate circuit
loops and is believed readily achievable with board
mounted components. Most power electronic loads are
inductive; the data in the figure is taken with a resistive load,
which approximates an optimally snubbed inductive load.
Power MOSFETs may be safely operated into an inductive
load; however, snubbing reduces switching losses.
Figure 7a. Capacitance Variation
Figure 7b. High Voltage Capacitance Variation
VDS, DRAIN−TO−SOURCE VOLTAGE (VOLTS)
10
100
10
10000
1000
100
10
Ciss
Coss
Crss
TJ = 25°C
VGS = 0 V
GATE−TO−SOURCE OR DRAIN−TO−SOURCE VOLTAGE (VOLTS)
10
0
10
15
20
7000
5000
3000
1000
0
VGS
VDS
TJ = 25°C
VDS = 0 V
VGS = 0 V
6000
4000
2000
55
Ciss
Coss
Ciss
Crss
Crss
25


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