I have an LM2596 buck converter module and a stick-on heatsink. The module has vias under the chip to copper on the back. Would it be more effective to put the heatsink on the chip or or on the back copper? I will also have a fan pointing at the module.
https://www.ebay.co.uk/itm/154400482541
https://www.ebay.co.uk/itm/155006886749?var=455172889923
https://www.ebay.co.uk/itm/154400482541
https://www.ebay.co.uk/itm/155006886749?var=455172889923