Our customer uses TPS54388C-Q1. They are testing loop stability. Our customer has design requirement,fcross110kHz，gain margin >12 dB, phase margin >45Deg, for both 2.5A and 0.5A output.
The input voltage is 5V and output voltage is 1V. The switching frequency is set as 2MHz. And there is no Cc cap parallel on FB. Could please help with below questions:
- Could you please advise a set of compensation parameter for this design?
- TPS54388C will decrease the frequency or not at light load? How does it response to light load?
- For the same circuit, the bode plot at 2.5A load current is the same as at 0.5A or not? Do you have bode plot at 0.5A?
- The Fcross is 100k, is this reasonable or not?
Thanks a lot for help!