TPS65261: I cannot get the output values ​​I want.

Dear Sir,

Pls kindly let me check and get back to you soon. Thank you!

BRs

Lucia

Thank you, I'll be waiting.

Hi Nuri,

Thanks for your understanding! Could you measure the Vfb1, Vfb2 and Vfb3? Are the reference voltage correct? And could you pls show me the LX1 waveform when Vout is not correct?

BRs

Lucia

Hello Lucia,

The values ​​are as follows.

Vfb1 - 0.256V
Vfb2 - 0.252V
Vfb3 - 0.242V

Below is the LX1 waveform.

Hi Nuri,

Pls kindly let me check and get back to you during these days. Thank you!

BRs

Lucia

Hi Nuri,

Pls try below:

(1) TPS65261 has average AC simulation model. Pls kindly check the loop stability performance and run the simulation to see if the loop is good.

(2) Pls kindly check whether there is any solderability issue of the device and the components, especially Ccomp and Rcomp.

(3) Is this issue happen for one board or all boards have this issue?

Thanks!

BRs

Lucia