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PM400HSA120_

USING INTELLIGENT POWER MODULES

MITSUBISHI ELECTRIC  

MITSUBISHI SEMICONDUCTORS POWER MODULES MOS

USING INTELLIGENT POWER MODULES

6.8 Handling Precautions for

Intelligent Power Modules

Electrical Considerations:

I. Apply proper control voltages

and input signals before static

testing.

II. Carefully check wiring of con-

trol voltage sources and input

signals. Miswiring may destroy

the integrated gate control cir-

cuit.

III. When measuring leakage cur-

rent always ramp the curve

tracer voltage up from zero.

Ramp voltage back down be-

fore disconnecting the device.

Never apply a voltage greater

than the VCES rating

of the device.

IV. When measuring saturation

voltage low inductance test fix-

tures must be used. Inductive

surge voltages can exceed de-

vice ratings.

Mechanical Considerations:

I. Avoid mechanical shock. The

module uses ceramic isolation

that can be cracked if the mod-

ule is dropped.

II. Do not bend the power termi-

nals. Lifting or twisting the

power terminals may cause

stress cracks in the copper.

III. Do not over torque terminal or

mounting screws. Maximum

torque specifications are pro-

vided in device data sheets.

IV. Avoid uneven mounting stress.

A heatsink with a flatness of

0.001"/1" or better is recom-

mended. Avoid one sided tight-

ening stress. Figure 6.48

shows the recommended

torquing order for mounting

screws. Uneven mounting can

cause the modules ceramic

isolation to crack.

Thermal Considerations:

I. Do not put the module on a hot

plate. Externally heating the

module's base plate at a rate

greater than 15°C/min. will

cause thermal stress that may

damage the module.

II. When soldering to the signal

pins and fast on terminals

avoid excessive heat. The sol-

dering time and temperature

should not exceed 230°C for

5 seconds.

III. Maximize base plate to

heatsink contact area for good

heat transfer. Use a thermal in-

terface compound such as

white silicon grease. The

heatsink should have a surface

finish of 64 microinches or

less.

Figure 6.48 Mounting Screws Torque Order

1

1

2

3

4

2

Sep.1998

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