I am trying to use an LM25576 and I am having a problem. It is designed for 3.8V at 2A, using a 10 :mu:H inductore
At light loads, it oscillates at about 5 - 10 Hz. The output voltage rises very fast, limited by the output capacitors, up to about the correct voltage. Then it seems to shut down and the output voltage decays down to about 3V, which takes 100 - 200 ms, and the whole lot starts again.
I can't see what would stop the IC from working for that long.
I have had this problem with the evaluation kit, as well as with the prototype that I have designed.
Any ideas?
At light loads, it oscillates at about 5 - 10 Hz. The output voltage rises very fast, limited by the output capacitors, up to about the correct voltage. Then it seems to shut down and the output voltage decays down to about 3V, which takes 100 - 200 ms, and the whole lot starts again.
I can't see what would stop the IC from working for that long.
I have had this problem with the evaluation kit, as well as with the prototype that I have designed.
Any ideas?