lots of spikes in the secondary using the TOP-271
Posted by: markbar
on
Hi i am using the TOP-271EG device driving a ETD44 transformer designed using "PI Expert" the power supply works very well however i am getting a lot of small spikes in the secondary. This is starting to cause issues with the sensitive ADC circuitry. While i can add extra filtering i would rather see if i can minimise the source of the spikes. Have attached the circuit of the PS. The picture is from a cro probe lying on top of the transformer no electrical connection. The small spikes seem to the be the main problem.
Regards
Mark
Files
| Attachment | Size |
|---|---|
| Schematic Prints PS.pdf | 24.35 KB |
The waveform seems to tell me that the output noise is what you are concerning about.
PLS make sure the tst setup of ripple and noise is correct ( every DER board shows the correct setup). If the noise is not caused by test setup, then the ripple can be reduced with lower ESR capacitor.
Regards