TPS54332: The phenomenon that the output voltage of TPS54332 drops by 1V

Conor

Part Number: TPS54332

Hi,

The power supply circuit is designed using TPS54332DDA.
24V input, 12.8V output, as shown in WEBENCH on TI's website, The circuit was configured with the constants of the peripheral elements confirmed by WEBENCH on the TI website.

Then, at an output of about 1A, a drop in output voltage and oscillation-like behavior were observed.The circuit configuration is shown in the attached PDF file "DCDC initial circuit" and the peripheral components are replaced with "WEBENCH_2A circuit" for confirmation. The rising waveform with a resistive load is also attached.

Any comments on the cause of this phenomenon would be appreciated.
7367.Schematic.pdf

Thnaks,

over 2 years ago

+1 Miranda Gu over 2 years ago

TI__Genius 16662 points

Hi Conor,

Actually your design doesn't follow webench recommended L and compensation parameters.

I guess here triggered OC causing Vout drop with heavy load, results look better with light load.

Can you use the webench L (10uH) and compensation parameters (COMP-pin R/C)? Besides, could you share your layout? I will review it.

0 Conor over 2 years ago in reply to Miranda Gu

Guru 13035 points

Hi Miranda,

The layout is confidential information and we would like to send it to you by private message.

Thanks,

Conor

0 Miranda Gu over 2 years ago in reply to Conor

TI__Genius 16662 points

Hi Conor,

Do you know TI local sales/FAE? You can let them send me an email, including sharing layout. My email address: miranda-gu@ti.com.

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TPS54332: The phenomenon that the output voltage of TPS54332 drops by 1V