T
treez
Guest
Hello,
We have a 4 layer, FR4 power supply PCB which lies on a large earthed heatsink. We want to heatsink the power FET to the heatsink. It dissipates 13W.
We would like to have a cutout in the PCB, which will be underneath most of the D2PAK FET’s body and drain tab. We will put a piece of copper into this cutout, and then cover it with a layer of gap pad, we will then crush the D2PAK FET down into the gap pad, and then solder the top bit of the D2PAK drain tab to the PCB at one side of the cutout, then solder the D2PAK's legs to the PCB at the other side of the cutout.
This should give us fantastic thermal coupling to the heatsink, do you agree?
Are there special FET packages which are more amenable to this kind of connection?
(also will be a ultra thin insulating layer under the gap pad.)
We are even thinking of doing this with a TO247 FET and with a powerful soldering iron, solder its tab to the PCB at one side of the cutout, and the legs (with a little bending etc), to the other side of the cutout.
Though the D2PAK offers greater ease, since its legs and its tab are kind of “level” with each other.
We have a 4 layer, FR4 power supply PCB which lies on a large earthed heatsink. We want to heatsink the power FET to the heatsink. It dissipates 13W.
We would like to have a cutout in the PCB, which will be underneath most of the D2PAK FET’s body and drain tab. We will put a piece of copper into this cutout, and then cover it with a layer of gap pad, we will then crush the D2PAK FET down into the gap pad, and then solder the top bit of the D2PAK drain tab to the PCB at one side of the cutout, then solder the D2PAK's legs to the PCB at the other side of the cutout.
This should give us fantastic thermal coupling to the heatsink, do you agree?
Are there special FET packages which are more amenable to this kind of connection?
(also will be a ultra thin insulating layer under the gap pad.)
We are even thinking of doing this with a TO247 FET and with a powerful soldering iron, solder its tab to the PCB at one side of the cutout, and the legs (with a little bending etc), to the other side of the cutout.
Though the D2PAK offers greater ease, since its legs and its tab are kind of “level” with each other.
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