LM2731: Why does the Vout change bigger?

Hi Luck

  Firstly, please check the power supply's current limit, you can set it ahout 2A.

If there is still an issue, could you describe the issue clearly?

How much current is the bigger load?

Could you test the Vout, SW and Vin waveforms? It will be helpful for me to analysis the problem.

Thanks a lot for your reply,can you tell me how to set the current limit to 2A?

Thanks a lot for your reply,
can you tell me how to set the current limit to 2A?

Hi,Jing
I could't understand the method of adjusting the power supply's current limit(such as 2A),Could you explain it again?
By the way,If I use a electrolytic capacitor(the value is 100uF）at the output of LM2731 as the schematic as shown。
Is there any influence about the output voltage of LM2731?


Thanks and Best Regards!
Gao

Hi Gaogao

  there is a easy way to check power supply's current limit, when the LM2731 works, you can test input voltage to check it is stable or not.

  you can put a 100uF electrolytic cap in the output. it will make output ripple smaller.

Hi Gao
Did you solve the problem?
if not, could you describe the problem in detail and tell me the value of Vout and Iout.
Could you test some waveform for me? switching node, FB node and Vin?
it will be helpful for me to analysis the issue.