AN3232

Package attachment to core by means of boltdown method

Doc ID 17594 Rev 3

17/26

Figure 7.

Ideal screw-center spacing

The boltdown procedure begins with the application of the TIM to the back of the package,

followed by the insertion of the package into the application board. In the partially exploded

view shown in Figure 7, the washers are positioned between the screw head and the bolting

surfaces of the package. It is best to start the screws in both tapped holes as demonstrated

in Figure 8, continuing in an alternating fashion until finger tightness is achieved. This

method insures the package is properly seated and aligned before the final tightening

sequence.