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Part Number: TPS54540
Would you help check the compensator? is it appropriate for switching frequency 950KHz and 650KHz?
Vin=9V to16V, Vout=5V, Iout=3.5A, Maximum ambient temperature=85C, switching frequency= 950KHz and 650KHz
Inductor= 10uH, Output capacitor: 470uF electrolytic capacitor//10uF MLCC
That looks good. I ran the sim in WEBENCH and got a phase margin around 97% at 13kHz so it will be good to react, a bit slow to correct, but it should be stable.
Here's a link to my WEBENCH design based on your inputs. You can use the, "Re-Comp" tab if you'd like to change your phase margin and crossover freq.
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In reply to Samuel Jaffe:
Thank you for your support.
We set the frequency to 950KHz and observed a voltage spike during start-up. The output voltage go up to around 8V. Could you teach me how to solve this issue?
In reply to Vito Liao:
Our customer told me that they did not see the voltage spike when the TPS54540 operated at 650KHz. I will try to get layout file.
BTW, can you re-check the compensator? We need them operate at both 950KHz and 650KHz.
Enclosed please kindly find the layout file.
I have a question. The TPS54540 has built-in an output overvoltage protection. Why was the OVP not triggered?
We connected the GND pin pad to the thermal pad under the IC and connected C78 GND pin to the GND pin of the IC. But it doesn't work. The issue cannot be solved.
The issue only occurs on first startup. You can see the vin rises from 0V to 12V. We don't see the spike if we disable the IC and then enable the IC ( the power supply is kept ON).
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