When the power down slew rate is extremely slow (ex: 3.3V -> 2V takes 10ms), it will result in an “oscillation” (or “power ring”).
For instance:
Input power droop below 2.5V -> All the circuits connect to the 61230’s output will be power off -> Input power will goes up slightly since it becomes “light load” at the moment -> Circuit sink current from 61230’s output since its power is back -> Input power droop below 2.5V
Is there any way to modify TPS61230’s peripheral to eliminate this issue?
“power ring” image(The blue line, which is TPS61230, VIN pin voltage) in below mail.
