Other Parts Discussed in Thread: LM25143
Tool/software:
Hi team,
When designing the LM25143 external circuit, our customers have chosen very large output capacitance value, including two electrolytic capacitors, and the loop circuit is unstable, the dynamic response does not meet requirements.
I adjusted the loop design on this basis, and when I tested with the loop analyzer, I found that when C53 (& Ccomp1) = 22nF, C47 (& Chf1) = 15pF R29 (& Rcomp1) = 20k, the loop is stable, and the dynamic response meets the requirements and the input / output current / voltage meets the requirements.
Could you please tell me that what is the risk for raising the capacitance value of C53 (& Ccomp1) to 22nF? And why the capacitance of the C53 (& Ccomp1) increases to 22nF can stabilize the loop circuit?
In addition, could you please tell me that what the specific effect of the large output capacitance on the loop circuit is and why?
Thank you!
