[Milkymist-devel] M1r4 review: power supply (was Re: Ask for reviews on M1R4 draft (was Re: M1R4 draft schematics))
werner at almesberger.net
Mon Mar 19 00:10:12 PDT 2012
Adam Wang wrote:
> Since Bom has 1uF/0402. Let C145 as 1uF directly, C234 goes for 10uF, how
> do you think ?
> @ 39 C, it's the temperature I measured for U12 after run 30 minutes,
With the case closed ? And what was the room temperature ?
> But a next
> scenario is that shall we put M1 in ambient temperature of 70 C ? If we
> assume M1 I think to be about common use product instead of experimental
> platform then it's in safe for 149.3 mA.
Yeah, depends a bit on what produces the ambient temperature.
E.g., other electronics in the neighbourhood could add some
heat, too. Luckily, the cable arrangement of M1 makes sure it
won't be completely surrounded by other devices.
I guess as long as nobody thinks of taking M1 to an open air
concert (40 C air temperature on a hot day, then maybe add
some direct sunlight, ...), we may be fine.
> Nice catch on TI's goof, It's being safe to change as 0603 as like:
Boom with data from last October found these choices:
Pos Qty P/N Description Value
1 100 P2.32KLCT-ND RES 2.32K OHM 1/10W 1% 0402 SMD USD 1.84
2 100 RMCF0402FT2K32CT-ND RES TF 2.32K OHM 1% 1/16W 0402 USD 1.05
3 100 RMCF0603FT2K32CT-ND RES TF 2.32K OHM 1% 0.1W 0603 USD 1.05
(I didn't find the Yageo RC0402FR-072K32L at Digi-Key.)
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