Hello,
My customer is using the TPS544C20 under the following conditions:
- VIN=12V, VOUT=0.85V, IOUTmax=25A, FSW=1MHz(Rrt=196kohm), without PMBus
They have an issue that when about 10 seconds have elapsed after Power On, the output was blocked as the ripple increases as shown below and the PG alarm occurred.
When they lowered the FSW to 500kHz (Rrt=39kohm), this output error did not occur.
Could you please explain what is the cause of this symptom?
Please suggest the best solution to solve the issue.
In Addition, please review the circuit diagram below to see iff there are any problems with the device design.
Thank you.
JH