I am working on a DC-DC switching supply design based on the LM2596S-12, my current board design is roughly 2"x2" with a full 1oz copper ground plane / heat sink on the bottom layer, I can run up to about a 1.5A load on the board and keep the thermal requirements just barely in check, but I want this board to be able to handle 2A continuous so it's obvious I need a heatsink, I am curious to know what company is recommended for a preferable stock component, the production level of these will probably be under 1000 units a batch so custom extrusion is out of the question, any recommendations?
Aavid Thermalloy is the first that springs to mind, but do a search for heatsinks at Mouser or Digikey, tons of different models and manufacturers to choose from.
Aavid Thermalloy is the first that springs to mind, but do a search for heatsinks at Mouser or Digikey, tons of different models and manufacturers to choose from.
Awesome, just took a look at their website and think I am going to sample a few things to test out.
I'd look at Digikey, Farnell, Mouser, etc and see what they stock up. There are DPAK heatsinks from Fisher. OTOH the simple switcher devices aren't the most up to date devices to use. Better look at some new chips from TI preferably with a synchronous rectifier. Most of the heat is produced in the diode.
I'd look at Digikey, Farnell, Mouser, etc and see what they stock up. There are DPAK heatsinks from Fisher. OTOH the simple switcher devices aren't the most up to date devices to use. Better look at some new chips from TI preferably with a synchronous rectifier. Most of the heat is produced in the diode.
If you know a part # that would be suitable that would be great, my main concern is the ability to handle 3A, I have been digging deep for a good alternative especially a cheaper one, because the LM2596 isn't exactly that cheap.
As far as the heatsinking itself goes size matters here, this product is designed for model aircraft so crazy wierd odd sized and shaped heatsinks like a lot of the DPAK ones aren't really feasible here, though probably would offer much better heat handling then the flat back style heat sinks I want to try out.
thermalloy. they have special heatsink for surface mounted to263 packages. you solder them on the copper slab and they sit 'over' the device.
My specs are Input range from 14V to 45V, and 3A continuous output. I tried quite hard to find a part to fit my needs, and taking into account pricing and function it seemed to be the best I could find, I am open to any better alternative, doesn't have to be DPAK though if it was it would mean less re-design.