4
5.4 IgBT Handling & replacement
Since IgBT gates are insulated from any other conducting region, care should be taken to prevent static build
up, which could possibly damage gate oxides. all IgBT modules are shipped from the factory with conductive
foam contacting the gate and emmiter sense pins.
always ground parts touching gate pins during installation. In general, standard ESD precautlions application
to fETs should be followed.
other handling precautions that should also be observed are as follows:
•
use grounded work station with grounded floors and grounded wrist straps when handling devices.
•
use a 100Ω resistor in series with the gate when performing curve tracer tests.
•
Never install devices into systems with power connected to the system.
•
Use soldering irons with grounded tips when soldering to gate terminals.
When mounting IGBT modules on a heatsink, certain precautions should be taken to prevent any damage against
a sudden torque. If a sudden torque (“one-sided tightening”) is applied at only one mounting terminal the ceramic
insulation plate or silicon chip inside the module may get damaged.
The mounting screws are to be fastened in the order shown in Figure 4-. Also, care must be taken to achieve maxi-
mum contact (i.e. minimum contact thermal resistance) for the best heat dissipation.
Application of a thermal pad on the contact surface improves it thermal conductivity. See Replacement Parts section
for the required pad.
A torque wrench should be used. Tighten mounting screws to 8 in-lbs
(. m-n); wire connecting screws to 19 in-lbs (.1 m-n). If torque is too heavy, the device can damage like the above
“one-sided tightening”.
Two-Point Mounting Type
Temporary tightening-
Final tightening-
figure 5-2. Screw fastening order
Four-Point Mounting Type
Temporary tightening -
Final tightening-
SECTIoN 5
MaINTENaNCE
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