TPS62136: Tracking funktion not precise

user5964071

Part Number: TPS62136

Hello,

I have simulated the attached schematic using your TPS62136 with PSpice. If the feedback voltage (green) is above 0.5V, it does not follow the tracking voltage (red) anymore the slope differs.

In conclusion the tracking is not precise enough for a ratiometric ramping scenario (cyan, pink).

Is this behaviour due to the simulation model or also seen in real world ? Especcially if considering the ramping in slva470a.pdf figure 9.

Best regards

Stefan

over 5 years ago

0 user5964071 over 5 years ago

Prodigy 40 points

0 JohnTucker over 5 years ago in reply to user5964071

TI__Guru**** 191445 points

Stefan

Many of our converters have a "soft handover" function on SS. Let me check to see if TPS62136 has that feature.

0 JohnTucker over 5 years ago in reply to JohnTucker

TI__Guru**** 191445 points

Stefan,

On the EVM the tracking function works as expected. CH2 = SS_TR, CH3 = FB.

0 user5964071 over 5 years ago in reply to JohnTucker

Prodigy 40 points

Hello John,

thanks for your clarification and measurements on the EVM.

Best regards

Stefan

Power management

Power management forum

TPS62136: Tracking funktion not precise