UCD9240 droop compensation

Russ Dill101288

Other Parts Discussed in Thread: UCD9240

Is it possible to compensate for delivery droop with the UCD9240?

There is a known amount of resistance (8mOhm) between my measurement point, and the load. The supply is 1V, and the amount supplied is between 1A and 20A, so the droop is causing errors of more than 10%.

over 12 years ago

0 Brad over 12 years ago

TI__Genius 13700 points

Connecting the feedback sense lines to bulk capacitance located near the load will allow the rail to compensate for the loss in the distribution.

0 Russ Dill101288 over 12 years ago in reply to Brad

TI__Prodigy 30 points

I've already done that. Problem is the droop is between the on the inner layers of the PCB and the die bond wires. There is no way to get a closer measurement.

0 Brad over 12 years ago in reply to Russ Dill101288

TI__Genius 13700 points

Sorry, there isn't any additional capabilities in the UCD9240 to account for droop after the feedback sense points. Increasing area of voltage plane supporting the load and/or increasing copper thickness may be only recourse to reducing resistance between the sense points and the load..

0 Russ Dill101288 over 12 years ago in reply to Brad

TI__Prodigy 30 points

Found a way to get closer to the load.

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UCD9240 droop compensation