Tool/software:
Thanks for your help! Based on the voltage we measured on Rset, it is actually a stable waveform. Therefore, the input to the internal compensation loop networkt is stable, and the Vc output of the compensation loop is correct. As we know from the data sheet, the LM25184 is a peak current mode regulator. My questions are:
1) What is the modulation method of the PWM output? How to the VRAMP waveform which is proportional to the primary current Ip of the flyback and the Vc which is equal to (VRSET-VREF)*Gm generate the PWM ?
2) What are the values of the internal Rcs and Gm?
3) What are the values of the R and C which is in series in the internal compensation network?
4) Will the soft start circuit introduce poles which would cause unstable control?
5) Given the voltage test result on Rset,test by channel 6 ,should the primary current Ip involved in the PWM regulation be suspected?
6) What kind of Ip waveform is acceptable for the LM25184? The amplitude of Ip is required to be 4.1A, dIp/dt = Vin/Lp，and what is the recommended range of dIp/dt?
7) The diagram in the image below illustrates the peak current mode regulation method. Does the LM25184 also regulate in this way? What are the different regulation mechanisms of the LM25184?
Best regards！
