I need to design a 12V dc circuit where I can turn on a variable current into a resistor load. I need two levels of current - ~50-75 ma for a few minutes, and 1-2 A for a few milliseconds. There is a chance the load will open under the high current scenario. I need help selecting a suitable MOSFET for this application.
The full project design today uses a cell phone to connect to a Raspberry Pi to control a DAC that controls the gate voltage of the MOSFET. The low current is used to test continuity of the load circuit, the high current is used to ignite a rocket motor. There is a need to measure the current drawn by the load.
A simple test circuit for the analog portion of the project is shown in the attached picture. The IRLZ34N is just a place holder to simulate the fuse model I used - it provides high current but not the low current part of the project.
Thanks for any help you can provide!
The full project design today uses a cell phone to connect to a Raspberry Pi to control a DAC that controls the gate voltage of the MOSFET. The low current is used to test continuity of the load circuit, the high current is used to ignite a rocket motor. There is a need to measure the current drawn by the load.
A simple test circuit for the analog portion of the project is shown in the attached picture. The IRLZ34N is just a place holder to simulate the fuse model I used - it provides high current but not the low current part of the project.
Thanks for any help you can provide!
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