Dear Team,
My customer is trying to build a design with TPS5430 to supply a pulsed load (actually a GPRS modem) which can draw up to 2A from almost no current levels. I have checked the schematics and it is looking OK. Layout is not perfect, but looks good.
According to Webench simulation, output voltage overshoot should be a little higher then 3.9V when the output voltage is set to 3.8V, but the customer sees overshoot exceeding 4.2V. Inductor value is 33uH and cap is 220uF electrolityc. I was not able to reach out the datasheet to see ESR. Tantalum caps are recommended on the datasheet. Could a standard electrolytic cap with high ESR cause such a big overshoot?
I can send the schematics and layout via email if needed.
Best Regards,
Caglar
