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Team-
We have the following query regarding the TPS82671 and it's tolerance of additional output capacitance:
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There are minimum capacitance requirements at the load that I can not control.
Does the TPS82671 have maximum output capacitance constraints? The spec states a maximum of 7uF of external capacitance under PWM mode.
Is this a firm requirement? What if I have a POSCAP on the output, or the caps are isolated with a ferrite bead with DCR = 10m for instance?
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Are there any tricks (beads, etc...) that we can use to allow additional capacitance to be added to the output of the TPS82671 w/o making it unstable?
Best regards, S. Dunbar, AFA Colorado
Team-
This is a ping- please respond to this thread as soon as possible.
Best regards, S. Dunbar
We probably missed answering the origial post because the subject line didn't start with the part number first. Sorry about that.
You can not add greater than 7uF of additional output ceramic output capacitance to the TPS82671 in PWM mode. Additional ceramic capacitance can cause the converter to go unstable. It might be possible to add additional capacitance that has significant ESR as long as the ESR zero is less than 6kHz. We'll try this and let you know the results of testing.
Thanks, please keep us posted. Please lt us know if you think adding a bead before the additional capacitance may be of use as well.
Best regards, S. Dunbar
Lab data confirms what Michael said.
I looked at the TPS82671EVM-646 Iout and Vout with:
See attached presentation.