TPSM33625: WEBENCH Calculation

Hi Brian,

It looks like there is an issue with a 1.1 V output. This may be due to the output voltage being too close to a 1 V output which is accomplished with FB being shorted to VOUT. This design is for 1.2 V, and it should be functionally very close to a 1.1 V design.

This design is for a 1 V design which does not require an external feedback resistor network to set the output voltage.

Thank you,

Joshua Austria

Hi Brian,

I suspect that the 1.1 VOUT works on the device and is just an issue with the WEBENCH model. However, the device should not have an issue providing 1.1 VOUT as long as the equations in section 7.3.2 of the datasheet are followed. For example, a 11 kOhm for RFBT and a 110 kOhm for RFBB or a 10 kOhm for RFBT and a 100 kOhm for RFBTT should provide 1.1 VOUT.

Thank you,

Joshua Austria

Hi Brian,

I will reach out to the Webench team and see if this can be sorted.

Thank you for bringing it to our attention. In any case, we recommend testing your application on the bench before validating it. The advice I gave above should hold for the bench.

Thank you,

Joshua Austria

Hi Brian, 

The team is looking into it. Regardless, this process can take a bit of time. I would advise utilizing the recommendations above, or using the PSPICE model if you need to simulate waveforms rather than waiting for the webench model to be fixed.

Thank you,

Joshua Austria