Low side mosfet burns when the battery is connected about arduino-mppt HOT 3 CLOSED

On Sat, 21 Mar 2020, 10:53 am Daniel Blankenship, ***@***.***> wrote: I discovered that I made a dumb mistake haha. The IR2104 chips I have, had a circular indention on the underside in one of the bottom corners that I mistook for being the pin 1 indicator. The actual indicator was printed on the top, on the opposite corner, so I had the chip connected backwards which likely contributed to my mosfet going up in smoke. Also this time I powered my arduino off the battery as you explained. Even though 12v is recommended, I learned that they could potentially handle up to 20v if the voltage regulator isn't being drawn from too heavily. I was concerned that the lead acid battery when charged could possibly reach 14-15 volts at its highest but it seems that this isn't a problem. I put together a stripped down version of this circuit on a breadboard for testing ir2104's, it just uses an led for the load instead of running an inductor coil. I made some test code and everything worked perfectly. The led changes brightness accordingly as I modify the pwm values through 75-245, making sure to disable the driver during changes. I also educated myself a bit more about ir2104 half bridges, it seems its fine not immediately having pwm from the arduino when power is first received, which makes more sense than what I speculated about it starting up the pwm my first post. I later tested this by powering it without the arduino connected and nothing melted. I appreciate you pointing me in the right direction, thank you for your help! [image: IMG_20200320_200358] <https://user-images.githubusercontent.com/47096143/77214707-b03c8500-6ae6-11ea-97b0-97ae0b557c43.jpg> [image: IMG_20200320_195924] <https://user-images.githubusercontent.com/47096143/77214713-b5013900-6ae6-11ea-9489-d26b52cb9c82.jpg> — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#3 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AJ7LPA6W636HLP5T2RS6LKTRIQFZTANCNFSM4LO5K7DQ> .