I came acros the following application note for a Depletion Mosfet (https://www.infineon.com/dgdl/Infineon-Application_Note_Applications_for_Depletion_MOSFETs-AN-v01_00-EN.pdf) and i got intrigued.
In the above image, the depletion mosfet is being used as a current source to power a load with a constant current (the best it can, since this type of current source as some oscilations in the output current - from what i read).
My question is, how can you calculate the power that is being dissipated in the depletion mosfet (couldn't find the answer from my search)? It's Vds*Ids?
The objective would be to use the depletion mosfet + a power resistor to dissipate the energy from a set of capacitors (constant current discharge). The objective is that the depletion mosfet dissipates the less possible and that the resistor (load) dissipates the energy.