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Member Since: April 17, 2011

Country: United States

  • it's worse than that, it may be as low as ~6-7V when cranking, around ~15V with the engine running and load dumps maybe as high as several hundreds volts. A car is the power supply from hell and electronics needs several layers of protecting to be reliable in a car


  • The ARM7 can run code from ROM and RAM, the flash is serial (but inside the package) and is copied to RAM at boot. I'm sure the SNAP OS give you the option to store the script in flash so it is persistent.

    funny to see a product with a MC13224 here, I was one of the guys that designed that chip when I was at freescale

  • yeh, we only use ceramics now they are better in pretty much every respect

    tantalum are just too much trouble. The tiniest bit of over voltage, reverse voltage, high current spike or temperature and they short, if that happens on a high current supply they catch fire and/or explode

  • The reverse diode in a standard mosfet is there as a side effect of how mosfet are build, it is not there to protect against esd. And for most parts it has the same current rating as the fet in forward direction, but mind the power limits and the slow speed.

    With inductive loads like relay the diode will function as a zener that a normal diode, clamping the voltage at the break down voltage. if the part is avalanche rated that is fine as long as you stay with in the energy limits

    Adding a standard silicon diode in parallel with a fet will often have no effect since it will be in parallel with the internal diode which is hotter and thus have a lower on voltage

  • if you just want to protect the fet from shorts and the likes, it is muhc simpler to use something like ST omnifets, they look and behave like regular fets but have current limiting and over-temperature shutdown

  • this is clearly not going out the door it is a quick hack to test something for the fun of it

    getting to a polished delivery from that is "just" work, and sometime that quick hacked together prof of concept is what gets the go ahead for a project

  • if there was added a mounting hole in the middle between the two A4983s a single screw could clam something like a short piece of aluminium u channel onto the top and/or bottom for heat sinking

No public wish lists :(