Gary Lech <[email protected]> writes: > It's another question from a newbie TeleMega user. I've read thru all > the documentation, nice job on the manual BTW, but I'm wondering what > the current rating is on the FET output switch. An unrestricted > Lithium battery can pack quite a punch. Should I be adding a current > limiting resistor to protect the FET?
The FETs we use can pass 19A continuously and 40A pulsed. At our default firing time of 50ms, we're somewhere in the middle of that range. If you have a 4.0V battery and a 1Ω igniter, the maximum current you'll deliver is only 4A, and that ignores all of the other resistance in the path (connectors, switches, screw terminals, wires, the FET itself (0.02Ω)). You'd have to find a way to get the resistance below 0.21Ω before you'd even reach the continuous current capacity of the FET. Even with a 12V pyro battery, you'd need a resistance below 0.63Ω. -- -keith
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