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| LED drivers on Boeing and Airbus passenger aircraft? |
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| mc172:
--- Quote from: Simon on January 04, 2020, 12:03:45 pm ---switch mode does not have to mean noisy, but it's a lot of work which is why the military/aero space rated regulators are more expensive. --- End quote --- I don't think that's true. From my experience in aerospace, the expense is usually to do with reliability (including meeting and proving MTBF requirements), meeting safety cases, number of points of failure and having to deal with a massive working temperature range. |
| Simon:
--- Quote from: mc172 on January 04, 2020, 09:34:43 pm --- --- Quote from: Simon on January 04, 2020, 12:03:45 pm ---switch mode does not have to mean noisy, but it's a lot of work which is why the military/aero space rated regulators are more expensive. --- End quote --- I don't think that's true. From my experience in aerospace, the expense is usually to do with reliability (including meeting and proving MTBF requirements), meeting safety cases, number of points of failure and having to deal with a massive working temperature range. --- End quote --- Yes AND the fact that you have to filter the crap out of the thing so where you had one power inductor and a capacitor now you have several, you don't use aluminium caps you use polymer caps, board space goes up and the tests are expensive. You could fail the test and so repeat again the whole design process. You can buy a thing half the size of a match box for £5 but it will pass virtually nothing, to get it to pass aerospace it will probably end up 4 times bigger along with all the testing and as you say the reliability considerations are also a factor but just getting it through EMC will make it an order of magnitude more expensive. |
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