MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
M.S.KENNEDY CORP.
600V/450A
HALF BRIDGE PEM
4800
FEATURES:
Half Bridge Configuration
600V Rated Voltage
450A Continuous Output Current
Internal Zener Clamps on Gates
Proprietary Encapsulation Provides Near Hermetic Performance
HI-REL Screening Available (Modified 38534)
Light Weight Domed ALSIC Baseplate
Robust Mechanical Design for Hi-Rel Applications
Ultra-Low Inductance Internal Layout
Withstands 96 Hours HAST and Thermal Cycling (-55°C to +125°C)
High Side Collector Sense Pin for De-Sat Detection
DESCRIPTION:
The MSK4800 is one of a family of plastic encapsulated modules (PEM) developed specifically for use in military,
aerospace and other severe environment applications. The half bridge configuration and 600 volt/450 amp rating make it
ideal for use in high current motor drive and inverter applications. The Aluminum Silicon Carbide (AlSiC) baseplate offers
superior flatness and light weight; far better than the copper or copper alloys found in most high power plastic modules.
The high thermal conductivity materials used to construct the MSK4800 allow high power outputs at elevated baseplate
temperatures. Our proprietary coating, SEES™ - Severe Environment Encapsulation System - protects the internal circuitry
of MSK PEM's from moisture and contamination, allowing them to pass the rugged environmental screening requirements
of military and aerospace applications. MSK PEM's are also available with industry standard silicone gel coatings for a
lower cost option.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
Motor Drives
Inverters
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ABSOLUTE MAXIMUM RATING
VCE
VGE
IOUT
IOUTP
VCASE
Collector to Emitter Voltage
Gate to Emitter Voltage
Current (Continuous)
Current Pulsed (1mS)
Case Isolation Voltage
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TST
TJ
TC
600V
±20V
450A
900A
2500 V
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Storage Temperature Range
-55°C to +125°C
Junction Temperature
150°C
Case Operating Temperature Range
MSK4800H
-55°C to +125°C
MSK4800
-40°C to +85°C
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ELECTRICAL SPECIFICATIONS
NOTES:
1
2
3
4
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Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Industrial grade devices shall be tested to subgroup 1 unless otherwise specified.
HI-REL grade devices ("H" suffix) shall be 100% tested to subgroups 1, 2 and sample tested to subgroup 3.
Subgroup 4 testing available upon request.
Subgroup 1, 4 T A = +25°C
2, 5 T A = +125°C
3, 6 TA = -55°C
All specifications apply to both the upper and lower sections of the half bridge.
V GE =15V unless otherwise specified.
Continuous operation at or above absolute maximum ratings may adversly effect the device performance and/or life cycle
Internal solder reflow temperature is 180°C, do not exceed.
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APPLICATION NOTES
THERMAL CALCULATIONS
Power dissipation and maximum allowable temperature rise involve many variables working together. Collector current,
PWM duty cycle and switching frequency all factor into power dissipation. DC losses or "ON-TIME" losses are simply
VCE(SAT) x Collector Current x PWM duty cycle. For the MSK4800, VCE(SAT)=2.6V max., and at 450 amps and a PWM
duty cycle of 30%, DC losses equal 351 watts. Switching losses vary proportionally with switching frequency. The MSK4800
typical switching losses at VCE=300V and ICE=450A are about 117.7mJ, which is simply the sum of the turn-on switching loss and the turn-off switching loss. Multiplying the switching frequency times the switching losses will result in a
power dissipation number for switching. The MSK4800, at 5KHz, will exhibit switching power dissipation of 589 watts.
The total losses are the sum of DC losses plus switching losses, or in this case, 940 watts total.
940 watts x 0.08°C/W thermal resistance equals 75 degrees of temperature rise between the case and the junction.
Subtracting 75°C from the maximum junction temperature of 150°C equals 75°C maximum case temperature for this
example.
VCE(SAT) x IC x PWM duty cycle = 2.6V x 450 amps x 30% = 357 watts DC losses
Turn-on switching loss + Turn-off switching loss = Total switching losses = 30.5 + 87.2 = 117.7mJ
Total switching loss x PWM frequency = Total switching power dissipation = 117.7mJ x 5KHz = 589 watts
Total power dissipation = DC losses + switching losses = 351 + 589 = 940 watts
Junction temperature rise above case = Total power dissipation x thermal resistance
940 watts x 0.08°C/W = 75°C temperature rise above case
Maximum junction temperature - junction temperature rise = maximum baseplate temperature
150°C - 75°C = 75°C
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TYPICAL PERFORMANCE CURVES
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SCREENING CHART
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MECHANICAL SPECIFICATIONS
WEIGHT = 272 GRAMS MAX.
ALL DIMENSIONS ARE SPECIFIED IN INCHES
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MECHANICAL SPECIFICATIONS CONT'D
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
MSK4800 H
SCREENING
BLANK=INDUSTRIAL; H=HI-REL (MODIFIED 38534)
GENERAL PART NUMBER
THE ABOVE EXAMPLE IS A MILITARY SCREENED MODULE.
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REVISION HISTORY
M.S. Kennedy Corp.
Phone (315) 701-6751
FAX
(315) 701-6752
www.mskennedy.com
The information contained herein is believed to be accurate at the time of printing. MSK reserves the right to make
changes to its products or specifications without notice, however, and assumes no liability for the use of its products.
Please visit our website for the most recent revision of this datasheet.
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