>On a sort of similar note, how many amps at say, 12 volts, can you put through >the outputs for say, 1/5 of a >second? I can't seem to find any mention of a >similar spec in the manual.
Bdale sent me this some time ago on this topic, I found it very helpful: The FET switches we're using on all of our current products that have pyro channels are the Vishay Siliconix Si7232DN. These parts have exceptionally low Rds(on) values, better than 0.02 ohms! That means they aren't making a lot of heat... and the limit on current is "package limited", meaning it's all about how much you can heat the die before something breaks. Cutting to the chase, the Si7232DN specs are 25 amps *continuous* at 20V at a temperature of 25C. In pulsed mode, they're rated for 40A. However, those specs are a little mis-leading because it really is all about the heat generated... you can get something like 85A through one briefly. Note that a typical commercial e-match only needed about 13 microseconds to fire in tests on my bench a couple years ago! So a great plan is to use something like an e-match as the initiator and build up pyrogen(s) as required to actually light what you're trying to light... But if you want to use a high-current igniter, we can probably handle it! [end of quote] >There should be a little piece of wire connecting the 'lipo' screw >terminal to the 'pyro' screw terminal. That provides power from the main >lipo battery to all of the pyro channels. Yeah, I had this pice of wire inserted. It doesn't make any difference. Also, all other pyro chanels besides Apogee and D show around 4.2 V (or 11.6 V with pyro battery) as they should while at the same time these two chanels show 0.0 V... - Andreas _______________________________________________ altusmetrum mailing list [email protected] http://lists.gag.com/mailman/listinfo/altusmetrum
