Electronics > Projects, Designs, and Technical Stuff
variable power supply circuit
rdl:
You probably won't be able to get by with one of those small heat sinks made from stamped and folded metal. Some kind of extrusion will be best, something like what Dave used for his dummy load (EEVBlog #102).
aneesh:
no its not about heatsink.. if u see the circuit attached i have given relevant information about the mosfet.
the internal resistance is just 3m ohm which is the best available .
so the power dissipation should be low but i think its because of the region of operation.
kallek:
Resistance is that only when mosfet is fully open. In your circuit mosfet is dissipating 15 volts.
You can reduce heat with transformer taps, but still you need bigger heatsink if your goal is 30V/5A.
aneesh:
look at this pic its dps3005 i.e 30v 5A with small hearsink
i am using bigger than this and better mosfet but i m not achieving this output
kallek:
Just can't compare switching and linear regulator no matter what your pass transistor is.
If you want much better efficiency you need some sort of switching pre-regulator.
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