takoda
Uploaded by
13 SLIDES
253 VIEWS
130LIKES

Evaluating TPS6102x Performance with Ceramic Output Capacitors and ESR Considerations

DESCRIPTION

This document presents the test results of the TPS6102x series evaluated using ceramic output capacitors specifically requiring an ESR above 30 mOhm. The evaluation, conducted with the TPS61020EVM-025, involved a DC load test at 2.5V input and 3.3V output, along with transient load simulations. Results indicate instability with ceramic capacitors due to low ESR, exhibiting oscillation and ripple at low frequencies. The performance was stable when using recommended capacitors. Recommendations for using ceramic output capacitors with added resistive ESR are provided.

1 / 13

Download Presentation

Evaluating TPS6102x Performance with Ceramic Output Capacitors and ESR Considerations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Using the TPS6102x with Ceramic Output Caps

  2. Datasheet Requires ESR above 30 mOhm

  3. Test Results • TPS61020EVM-025 evaluated with a DC load and with a load transient • Evaluated with both recommended output capacitors and non-recommend output ceramic capacitors • Test conditions: 2.5V in, 3.3V out, DC load 500 mA, transient load 200 mA to 500 mA • Slides 4-7 are the standard EVM circuit with the proper output capacitor, while slides 8-12 use only ceramic

  4. Output Voltage Ripple (DC Coupled)

  5. Output Voltage Ripple (AC Coupled)

  6. Transient Response (DC Coupled)

  7. Transient Response (AC Coupled)

  8. EVM Modified by Replacing C3 with 22uF ceramic Insert 22uF ceramic

  9. Output Voltage Ripple (DC Coupled)

  10. Output Voltage Ripple (AC Coupled)

  11. Transient Response (DC Coupled)

  12. Transient Response (AC Coupled)

  13. Conclusion • TPS6102x is unstable with ceramic output capacitors, which have low ESR • Shows low frequency oscillation/ripple • Performance is normal when output capacitors with sufficient ESR are used • If ceramic output capacitors are required: • Use the newer, smaller TPS61200 • Use ceramic output capacitors with a discrete 30 mOhm resistors in series to give them the needed ESR

More Related