Timeline for Getting partial flow; downstream from transistor doesn't seem to be working
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| Oct 31, 2017 at 5:52 | comment | added | WhatRoughBeast | @eidylon - Oops - IRLZ44N. Sorry. And the number you want is hfe, also known as beta, and generally gain. This varies with operating conditions, and if you want Vce to be small (like a switch turned on) the usual rule of thumb is between 10 and 20. For Darlingtons this isn't true - their gain is much higher, at the expense of minimum Vce. Look at the data sheet for the TIP102,and you'll see the base current specified for various collector currents. | |
| Oct 30, 2017 at 16:53 | comment | added | eidylon | This answer makes the most sense to me, because it explains both why the LEDs aren't working, as well as why they do work when I take the transistor out of the circuit. Also explains which number I need to look at for the flow - Vce(sat). To go with that, what is the usual nomenclature/terminology for the number which indicates the value necessary to actually switch the transistor on? One other Q, I tried looking up the IRZL44N in google and on mouser, and couldn't find it. Just want to double check there wasn't a spelling error there at all. | |
| Oct 28, 2017 at 18:29 | history | answered | WhatRoughBeast | CC BY-SA 3.0 |