Hi team，
Regarding its power loop stability, what is the required range of phase margin and gain margin?
Our current actual measurement results show that the phase range is from 70° to more than 90°, and the gain is from -10dB to -20dB. Will there be any problems in use if the phase margin is too large?
Do other models of TI power supplies have the same requirements for phase margin and gain margin?
Hello Alan,
Gain Margin seems fine. With the phase margin, normally phase margin higher than 45 degrees. Coming to what is the maximum phase margin:
It depends on what is the maximum settling time you can choose. Because with the higher phase margin, it will take more settling time during transient response. So it is like an overdamped system, overshoot/undershoot will be lower but settling time will be higher.
Another parameters that matters also is the crossover frequency which tells the bandwidth of the control loop. Higher the crossover frequency, higher the bandwidth, faster the system.
Thanks,
Farheen
