| Electronics > Projects, Designs, and Technical Stuff |
| Improving output noise on a DPS3003 power supply module |
| (1/1) |
| DG2MMT:
Hi everyone, I had some really nice success improving the output noise of my DPS3003 based power supply and just want to share my findings. I recently got my first oscilloscope (!) and one of my first measurements was on the output of my power supply. And what I saw was not so good: ringing noise up to 900 mV peak to peak with a 30 Ω load and 12 V output voltage. After some testing with different parts I got it down to about 90 mV peak to peak, so I would say, this was a full success. ;D What did I do? * Adding a snubber to the switch-node with 2.2 Ω and 620 pF (150 pf || 470 pF) * adding a filter to the output with a ferrite ring with 2 windings for + and - and a 100 nF capacitorAnd here some pictures: DS1Z_QuickPrint4.png: Output power supply 1 before modification. DS1Z_QuickPrint25.png: Output power supply 1 after modification. DS1Z_QuickPrint26.png: Output power supply 2 before modification. DS1Z_QuickPrint32.png: Output power supply 2 after modification. |
| Kleinstein:
Looks impressive for such a small modification. :-+ |
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