Moteur de recherche de fiches techniques de composants électroniques
  French  ▼

Delete All


Preview PDF Download HTML

MMDF6N02HD Fiches technique(PDF) 4 Page - Motorola, Inc

No de pièce MMDF6N02HD
Download  10 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  MOTOROLA [Motorola, Inc]
Site Internet
Logo MOTOROLA - Motorola, Inc

MMDF6N02HD Fiches technique(HTML) 4 Page - Motorola, Inc

  MMDF6N02HD Datasheet HTML 1Page - Motorola, Inc MMDF6N02HD Datasheet HTML 2Page - Motorola, Inc MMDF6N02HD Datasheet HTML 3Page - Motorola, Inc MMDF6N02HD Datasheet HTML 4Page - Motorola, Inc MMDF6N02HD Datasheet HTML 5Page - Motorola, Inc MMDF6N02HD Datasheet HTML 6Page - Motorola, Inc MMDF6N02HD Datasheet HTML 7Page - Motorola, Inc MMDF6N02HD Datasheet HTML 8Page - Motorola, Inc MMDF6N02HD Datasheet HTML 9Page - Motorola, Inc Next Button
Zoom Inzoom in Zoom Outzoom out
 4 / 10 page
background image
Motorola TMOS Power MOSFET Transistor Device Data
Switching behavior is most easily modeled and predicted
by recognizing that the power MOSFET is charge controlled.
The lengths of various switching intervals (
∆t) are deter-
mined by how fast the FET input capacitance can be charged
by current from the generator.
The published capacitance data is difficult to use for calculat-
ing 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 resis-
tive 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
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 val-
ues 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 cal-
culating td(on) and is read at a voltage corresponding to the
on–state when calculating td(off).
At high switching speeds, parasitic circuit elements com-
plicate 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 func-
tion 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 mea-
sure and, consequently, is not specified.
The resistive switching time variation versus gate resis-
tance (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 op-
erated into an inductive load; however, snubbing reduces
switching losses.
Figure 7. Capacitance Variation
TJ = 25°C

Html Pages

1  2  3  4  5  6  7  8  9  10 

Fiches technique Télécharger

Go To PDF Page

Lien URL

Politique de confidentialité
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
All Rights Reserved©

Mirror Sites
English :  |   English :  |   Chinese :  |   German :  |   Japanese :
Russian :  |   Korean :  |   Spanish :  |   French :  |   Italian :
Portuguese :  |   Polish :  |   Vietnamese :