pm75cs1d120 Mitsumi Electronics, Corp., pm75cs1d120 Datasheet - Page 17

• Manufacturer Part Number: pm75cs1d120
• Description: Mitsubishi Ipm L1/s1-series Application Note Igbt Modules
• Manufacturer: Mitsumi Electronics, Corp.

9.Reliability
10. Installation of power Module
Please refer to the URL of our web site. “http://www.mitsubishichips.com/Global/index.html”
10-1. Installing Capacitor
10-2. Installation Hints
voltage can appear on the IPM and cause damage. In order to avoid this problem, guidelines that should be
followed in designing the circuit layout are:
Note) Maximum torque specifications are provided in device data sheets. The type and quantity of thermal
not considered to avoid complicating the circuit. In addition, combination of
limit on the length of wiring. The bypass capacitor of approach
Select a compound, which has stable characteristics over the whole operating temperature range and does not
change its properties over the life of the equipment.
extruded before final tightening screws.
During switching, voltage is induced in power circuit stray inductance by the high di/dt of the main current. This
To achieve the best thermal radiation effect, the bigger the contact area is, the smaller the thermal resistance is.
Heat-sink should have a surface finish in range of Rz6 ~ Rz12, curvature within 100 m.
100~200 m according to the surface finish.
in a cross pattern. As mentioned before, over torque terminal or mounting screws may result in damage of IPM.
When mounting IPM on a heat-sink, uneven mounting can cause the modules ceramic isolation to crack.
Uniform coating of thermal grease between the module and heat-sink can prevent corrosion of contact parts.
When an electric driver is used, thermal grease with low viscosity is recommended and extra grease must be
Use a uniform coating of thermal interface compound. The thickness of thermal grease should be ranked in
Mounting screws should be tightened by using a torque wrench to the prescribed torque in progressive stages
Located the smoothing capacitor as close as possible to the IPM
Use ceramic capacitor near the IPM to bypass high frequency current
Adopt low impedance electrolytic capacitor as smoothing capacitor
Use snubber circuit to absorb surge voltage
Decrease switching speed in order to lower di/dt.
and
compounds having an effect on the thermal resistance are determined by consideration of both thermal
grease and heat-sink. Typical value given in datasheet is measured by using thermal grease produced
by Shin-Etsu Chemical Co.,Ltd.
(G-746, which has not issued in Shin-Etsu's publications, is almost the same as G-747.)
L1 : Stray inductance between the electrolytic capacitor and the IPM.
L2 : Stray inductance between the filter capacitor and the driver.
L3 : Stray inductance between the load and the power circuit's output stage
* For the recommended torque order for mounting screws referring to "Installation Method" in the
section of
"Correct and Safety Use of Power Module"
C
are the most effective to reduce surge voltage. The stray inductance of snubber circuit generally is
Smoothing
Snubber
Smoothing
Snubber
L
L
1
1
Reliability, Installation of power Module
L
2
L
2
L
L
3
3
17
Load
Mitsubishi IPM L1/S1-Series Application Note
L2 small
vce
act as a snubber when oscillation is occurring.
,
,
is needed since there is a
L2 large
Sep. 2008