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PDF MTB9N25E Data sheet ( Hoja de datos )
| Número de pieza | MTB9N25E | |
| Descripción | High Energy Power FET | |
| Fabricantes | ON Semiconductor | |
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MTB9N25E
Designer’s™ Data Sheet
TMOS E−FET.™
High Energy Power FET
D2PAK for Surface Mount
N−Channel Enhancement−Mode Silicon
Gate
The D2PAK package has the capability of housing a larger die than
any existing surface mount package which allows it to be used in
applications that require the use of surface mount components with
higher power and lower RDS(on) capabilities. This advanced TMOS
E−FET is designed to withstand high energy in the avalanche and
commutation modes. The new energy efficient design also offers a
drain−to−source diode with a fast recovery time. Designed for low
voltage, high speed switching applications in power supplies,
converters and PWM motor controls, these devices are particularly
well suited for bridge circuits where diode speed and commutating
safe operating areas are critical and offer additional safety margin
against unexpected voltage transients.
• Robust High Voltage Termination
• Avalanche Energy Specified
• Source−to−Drain Diode Recovery Time Comparable to a
Discrete Fast Recovery Diode
• Diode is Characterized for Use in Bridge Circuits
• IDSS and VDS(on) Specified at Elevated Temperature
• Short Heatsink Tab Manufactured — Not Sheared
• Specially Designed Leadframe for Maximum Power Dissipation
http://onsemi.com
TMOS POWER FET
9.0 AMPERES, 250 VOLTS
RDS(on) = 0.45 W
D2PAK
CASE 418B−02
Style 2
D
®G
S
© Semiconductor Components Industries, LLC, 2006
August, 2006 − Rev. 1
1
Publication Order Number:
MTB9N25E/D
1 page  
MTB9N25E
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.
2000 VDS = 0 V
Ciss
1600
VGS = 0 V
TJ = 25°C
1200
800 Crss
Ciss
400 Coss
0
10 5
Crss
05
10 15
20 25
VGS VDS
GATE−TO−SOURCE OR DRAIN−TO−SOURCE VOLTAGE (VOLTS)
Figure 7. Capacitance Variation
http://onsemi.com
5
5 Page 
MTB9N25E
TYPICAL SOLDER HEATING PROFILE
For any given circuit board, there will be a group of control
settings that will give the desired heat pattern. The operator
must set temperatures for several heating zones, and a
figure for belt speed. Taken together, these control settings
make up a heating “profile” for that particular circuit board.
On machines controlled by a computer, the computer
remembers these profiles from one operating session to the
next. Figure 18 shows a typical heating profile for use when
soldering a surface mount device to a printed circuit board.
This profile will vary among soldering systems but it is a good
starting point. Factors that can affect the profile include the
type of soldering system in use, density and types of
components on the board, type of solder used, and the type
of board or substrate material being used. This profile shows
temperature versus time. The line on the graph shows the
actual temperature that might be experienced on the surface
of a test board at or near a central solder joint. The two
profiles are based on a high density and a low density board.
The Vitronics SMD310 convection/infrared reflow soldering
system was used to generate this profile. The type of solder
used was 62/36/2 Tin Lead Silver with a melting point
between 177 −189°C. When this type of furnace is used for
solder reflow work, the circuit boards and solder joints tend
to heat first. The components on the board are then heated
by conduction. The circuit board, because it has a large
surface area, absorbs the thermal energy more efficiently,
then distributes this energy to the components. Because of
this effect, the main body of a component may be up to 30
degrees cooler than the adjacent solder joints.
200°C
STEP 1
PREHEAT
ZONE 1
RAMP"
STEP 2
VENT
SOAK"
STEP 3
HEATING
ZONES 2 & 5
RAMP"
STEP 4
STEP 5
HEATING HEATING
ZONES 3 & 6 ZONES 4 & 7
SOAK"
SPIKE"
DESIRED CURVE FOR HIGH
MASS ASSEMBLIES
160°C
170°C
STEP 6
VENT
STEP 7
COOLING
205° TO 219°C
PEAK AT
SOLDER JOINT
150°C
100°C
150°C
100°C
140°C
SOLDER IS LIQUID FOR
40 TO 80 SECONDS
(DEPENDING ON
MASS OF ASSEMBLY)
DESIRED CURVE FOR LOW
MASS ASSEMBLIES
50°C
TIME (3 TO 7 MINUTES TOTAL)
TMAX
Figure 18. Typical Solder Heating Profile
http://onsemi.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MTB9N25E.PDF ] | |
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