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PMP10902: Power limit at 1.5Amps

Genius 13859 points
Part Number: PMP10902

Hi Experts,

I have a client who applied one of our reference design for synchronous buck converter that can output up to 4.5A regulated at 12V, but his testing limits up to 1.5A only. Below is the full transcript from this client:

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We are trying to implement the PMP10902. We are following Rev 2 of the schematic.

The application:
We have a 12V pump that we slowly ramp up with a duty cycle (that you can see with the percentage included in the attachment). We ramped up these values slowly in order to reduce the likelihood of transients affecting the performance. It appears that any time the buck converter begins to hit 1.5 amps, the performance drops and the motor begins to stutter. Another interesting note, we added an electrolytic capacitor (220uF) on the output of the buck converter and that actually reduced the performance and made it so it begins to stutter sooner. (The amperage was not recorded at this point but I felt the observation would be useful for diagnostics).

Another note is that we have used the following for verifying if our circuits work with our motors www.amazon.com/.../ref=sr_1_3

That DC-DC 24V to 12V seems to not have any issues with delivering the power to the pump that is giving us issues which is what we used to check verify it was the buck converter giving us issues.

We ended up using the IHLP4040DZER100M11 for our inductor on L1

Thank you for your time
- Cody

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An attachments are provided below, for your information.

Than you for your support.

Regards,

Archie A.

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