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| Low profile heat sink, 3.6W, closed space |
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| Axk:
Looking at dissipating 3.6W in a closed space (ebike controller/battery bag). I will need to regulate from 54.6V down to 3.3V, with low noise to not affect current measurement (12bit, 5mA-20A), so I think I should use a liner regulator, thus the power dissipation requirement. Would like the (power meter) board to be as thin as possible to not take much additional space in the bag, ideally 1cm. Thinking about a metal plate the size of the board (probably 5cmx10cm) as a heatsink to attach a TO220 transistor. Are such heat sinks available? Any alternative solutions? Aluminum cases are thick and I have a Bluetooth module that won't work though an aluminum case I suppose. |
| Axk:
Aluminum plates of various sizes appear to be cheaply available from ebay. |
| jonroger:
I'd use a buck converter, If you can't get noise low enough, put a linear regulator after it. |
| Axk:
It's not horribly difficult I suppose, but still I would need to spend time learning how to use a buck converter chip and it adds potential mistakes to the design. Linear regulators are easy. I've looked for DC-DC modules with suitable voltage and current and they are quite bulky and expensive. Maybe I should reconsider and try find a buck converter chip locally, and quickly try it if I can make it work for my input voltage and current... I'm also worried about radiated noise from the buck converter's inductor, not sure if it will be an issue. Could provision for a can on top of the regulator or the analog circuitry maybe to mitigate this. I'll be dealing with 1 LSB currents of 200nA and voltages of 600uV. |
| Miti:
https://www.ebay.com/itm/DC-DC-Buck-Step-Down-Converter-Regulator-Module-3-3V-5V-9V-12V-24V-36V-48V-60V/173254382932?hash=item2856c41554:g:fdQAAOSwCPdaxZc8&frcectupt=true Edit: Never mind, it's linear. The title says buck step down. but this looks good: https://www.ebay.com/itm/Adjustable-6-5-60V-to-1-25-30V-10A-Step-down-Charger-Module-Power-Supply/183130489462?hash=item2aa36d8276:g:124AAOSwiqdaq-au |
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