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Blog TI SWIFT™︎ Power Module EVM RoadTest: Noise Measurements
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  • Author Author: Jan Cumps
  • Date Created: 3 Mar 2018 9:51 AM Date Created
  • Views 729 views
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TI SWIFT™︎ Power Module EVM RoadTest: Noise Measurements

Jan Cumps
Jan Cumps
3 Mar 2018

I'm reviewing a single component DC converter for the TI SWIFTTm Power Module EVM RoadTest.

This blog is a request by genebren to characterise the noise at output.

 

Feel free to comment with the tests you'd like to see done with the module.

image

 

 

genebren  wrote:

 

...  Have you characterized the noise levels on the output?  It would be interesting to see what the output looks like.  ...

Gene

 

Test Conditions

 

I've chosen the highest input voltage aloud and the lower end of the output voltage.

The current is the maximum I can draw from the device with the tools I have.

  • VIN: 14 V
  • VOUT: 0.6 V
  • IOUT: 7.75 A

 

I've put an oscilloscope probe on the output, in x10 mode.

Measurements

 

DC 200 mV /DIV

image

 

AC 10 mV/ DIV, 50 ns /DIV

image

 

Cursors to show the switching frequency component of 4 MHz.

image

 

With 20 MHz bandwidth filter enabled - same as in the datasheet specifications.

image

image

I measure 12 mV without external caps, 14 V in and 0.6 V out, 7.75 A

image

 

Same settings as in the datasheet, except the capacitors - 14 V in, 1V out, 1 A:

image

 

 

Related blog
TI SWIFTTm Power Module EVM RoadTest: Module Review and Test Setup
TI SWIFTTm Power Module EVM RoadTest: Noise Measurements
TI SWIFTTm Power Module EVM RoadTest: Efficiency
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Top Comments

  • Jan Cumps
    Jan Cumps over 7 years ago in reply to genebren +2
    genebren wrote: ... Not too bad. I have seen much worse. ... Yes. For many applications this will do. For others, capacitors can be added just like with discrete switchers.
  • genebren
    genebren over 7 years ago +1
    Jan, Not too bad. I have seen much worse. Thanks for the data. Gene
  • Jan Cumps
    Jan Cumps over 7 years ago in reply to genebren

    genebren  wrote:

    ...

     

    Not too bad.  I have seen much worse.

    ...

     

    Yes. For many applications this will do. For others, capacitors can be added just like with discrete switchers.

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  • genebren
    genebren over 7 years ago

    Jan,

     

    Not too bad.  I have seen much worse.

     

    Thanks for the data.

    Gene

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