Recently I bought two of these, I was needed to remove all of the pots since they where bad. I soldered a resistor (500K) like this to the board to make sure that the undervoltage protection won't go off, since that was the issue I had when I powered up the board for the first time. That issue caused the fault led to light up and the output to not work.
I got one board working, since I wanted to get one working before I changed the other one. I am not sure if the resistor fix is correct here.
Now, a few days (maybe weeks further), I continued with the project and tried a reverse polarity protection circuit. That didn't work very well, but it was fun to see something, that is not supposed to light up, light up (@28.5V). Everything continued to work after the short!
The next day I soldered the banana plugs that came in to the output wires and all of a sudden the device wouldn't power more than around 2.8V. The fault led is lighting up and the chip is getting very hot.
Did I blew up the chip by testing out the lighting effects on components?
The strange thing is that, the other board isn't working at all. Same problem as the first one.
I didn't test the shortcut capabilities of the second board though.
I have ordered two new LTC3780's and a few of the LM358N's to make sure that they are all good.
I am doing anything wrong?
 |
