Hi!
I have a question about cooling PCBs. And I am very unexperienced with this.
I am building a low-noise RF amplifier by using several THS3091 in parallel and bridge configuration to achieve up to 2.5 W into 50 Ohms. I also would like to put the circuit into a grounded aluminum enclosure for RF shielding.
The heat of the op-amps is sunk into the PCB ground plane. And the heat of the (linear) voltage regulators is sunk into the PCB power planes.
Should I attach the PCB to the enclosure and attach a heatsink to the enclosure from the outside?
What would you recommend to attach the PCB to the enclosure with good thermal connection but also provide electrical isolation to the power planes?
(1) Leave the solder mask and use thermal epoxy / thermal paste??
(2) Remove solder mask and use an electrically isolating thermal pad??
(3) Remove solder mask and use electrically isolating thermal epoxy / thermal paste??
(4) Something better than the above??
Can you recommend certain part numbers for thermal epoxy / paste / pad??
Thank you so much!!!