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Microsemi SP4, Mounting Instructions, Page: 3 / 5

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Microsemi SP4 Mounting Instructions Download Page 3

 

 

3/5 

Application note 

APT0501 

December 2011 

www.microsemi.com 

 

 

 

fig 4: SP4 base plate with properly applied thermal grease after removal from heat sink. 

 

 

3.

 

Hole diameters in the PCB. 
3.1

 

Top view. 

 

 

Fig 5: pad and hole diameters (in millimeters). 

 

SP4 pinout can change according to the configuration (full bridge, boost chopper…). Each module 
datasheet has specific hole location information.  

Hole 

∅

 2.9

±0.1

(4x)

hole 

∅

 1.5

±0.1

 

pad 

∅

 2.8

±0.1

 

Hole 

∅

 12.7

±0.1 

(2x) 

Heat sink 

PCB 

Summary of Contents for SP4

Page 1: ... 1 6 mm 0 063 thick PCB use a plastite screw 6 mm 0 25 long The maximum mounting torque is 0 6Nm 5 lbf in In any case the customer must check the integrity of the plastic post after screwing fig 2 example of plastite screw The second step consists of soldering all electrical pins of the power module to the PCB Wave soldering or manual soldering processes are recommended to solder the signal and po...

Page 2: ... M5 The screw length must be at least 12 mm 0 5 First lightly tighten the two mounting screws Tighten alternatively the screws until their final torque value is reached 4 7 N m max or 3 5 lbf ft It is recommended to use a screwdriver with controlled torque for this operation If possible screws can be tightened again after three hours The quantity of thermal grease is correct when a small amount of...

Page 3: ...ter removal from heat sink 3 Hole diameters in the PCB 3 1 Top view Fig 5 pad and hole diameters in millimeters SP4 pinout can change according to the configuration full bridge boost chopper Each module datasheet has specific hole location information Hole 2 9 0 1 4x hole 1 5 0 1 pad 2 8 0 1 Hole 12 7 0 1 2x Heat sink PCB ...

Page 4: ...le mounting screws fig 6 Power module assembly on heat sink and PCB 4 Mounting instructions if using a large PCB If a large PCB is used additional spacers between the PCB and the heat sink are necessary It is recommended to keep a distance of at least 5 cm between the power module and the spacers see fig 7 The spacers must have the same height as the plastic posts 17 mm 0 5 fig 7 Spacers used on l...

Page 5: ...nnection push pull forces When the PCB is mounted onto the power module and the terminals soldered to it some mechanical forces may be applied to the terminals Such push or pull forces must not exceed 10N 2 25lbf maximum per individual connector This acceptable maximum value of push pull force may vary depending on the mounting and operating conditions Conclusion This application note gives the ma...

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