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D-PAK Heat dissipation

  • Thread starter Vladimir Vassilevsky
  • Start date
V

Vladimir Vassilevsky

Jan 1, 1970
0
Hello All,

There is a D-PAK on the top of the PCB. The heatsink plane is attached
to the bottom of the PCB. How much power could be possible to dissipate
at this D-PAK, i.e. what would be the ballpark of Rt ?

The PCB is double sided 2oz 1.5mm FR-4. The area of the solid copper
around the part is 1 sq.in. on the top and bottom. It is possible to put
as many plated vias as we want. The heatsink plane temperature can be
considered to be uniform; the Rt is 2C/W.


Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com
 
D

David L. Jones

Jan 1, 1970
0
Vladimir Vassilevsky said:
Hello All,

There is a D-PAK on the top of the PCB. The heatsink plane is attached to
the bottom of the PCB. How much power could be possible to dissipate at
this D-PAK, i.e. what would be the ballpark of Rt ?

The PCB is double sided 2oz 1.5mm FR-4. The area of the solid copper
around the part is 1 sq.in. on the top and bottom. It is possible to put
as many plated vias as we want. The heatsink plane temperature can be
considered to be uniform; the Rt is 2C/W.

What maximum temperature rise are you willing to tolerate?

There are DPAK SMD heatsinks which can help, ses a thread a few weeks back.

Dave.
 
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