TPS71501-EP: Tps71501 output voltage overshoot

hongwei duan

Part Number: TPS71501-EP

Hello, I would like to ask, when the TPS71501 is supplying power to the single-chip 3.3V, how to solve the TPS71501 output voltage overshoot, is it Cfb? How to calculate Cfb

over 6 years ago

0 Christian Yots over 6 years ago

TI__Genius 14540 points

Hi,

The apps engineer supporting this device is out of the office on vacation. I will attempt to route this to another resource but a response might be delayed somewhat.

Thanks,

Christian

0 Javier Valle over 6 years ago in reply to Christian Yots

TI__Expert 4420 points

Hi, the Cfb capacitor will add a pole and a zero to the control loop. When placed near the cross-over frequency, it can help to improve phase margin and bandwidth which will translate to improvement in the transient response (such as the overshoot you mention). I recommend the app note below which describes the process to come up with the Cfb value. The app note is for DC-DC converters but the concept is the same.

http://www.ti.com/lit/pdf/SLVA289

Thanks,

0 hongwei duan over 6 years ago in reply to Christian Yots

Intellectual 450 points

thank you very much.

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TPS71501-EP: Tps71501 output voltage overshoot