Other Parts Discussed in Thread: LM5143
In our LM5143EVM,there is a start-up characteristic showing as following:
With the Css=68nF setup, the calculated soft start time should be 1.94ms, but I am little confusing about the 1.9ms time division.
In above waveform, there is a no swtiching stage after Vin is over UVLO threshold which is 0.9ms roughly; and then the output voltage rising stage is 1ms;
So what is the first stage for? And the calculated SS time is usual the stage 1 + Stage 2 Vo rising, if this understanding is right?