Tool/software:
Hi. using LM5180 dual out put
Transformer design Nps = 1.2 , Lm = 40uH
Output Voltage = 20V , 0.1A
When Rfb = 300K and Rset = 16K, the output voltage is 20V. Is it possible to change Rset to 12.1K? Will there be any issues if I change Rset? Additionally, when I measure the voltage at Rset with a multimeter, the IC stops functioning. Is there no way to measure the voltage at Rset?
My circuit
Hi,
Thank you designing with the LM5180. According to the datasheet, Rset should always be 12.1k. I don't know why you used 16k there. Please change your RFB by the same factor, namely make it satisfy the following equation:
Regarding RSET, it is not a dc pin. Instead, it is dynamic and used for internal sample and hold. So, do not probing it nor disturbing it during operation.
Hope this clarifies.
Regards,
Youhao
