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Minimum OScilloscope requirement for SMPS

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sunil21

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My flyback and Forward converter Designs are in the range 50khz-100khz..
I want to know if a 50mhz oscillosope is enough for this purpose. (There is one i can get - 50MHZ)
 

yes 50MHz ok, but remember the max rise time it will be able to depict is 0.35/50e6 seconds.
Anything rising faster than that will get filtered.
 

I got an other option to get one of 25mhz from my friend..
CHecking flyback ringing etcc... will that be enough?
or have any workaround with this one scope?
 

Hi,

25 milliHertz won't be sufficient. ;-)

Now some hopfully useful information:
I'd say a 50MHz analog scope should work, but in detail nobody knows your ringing frequency.

For a digital scope I'd go for way higher than 1 MSampl/s. There are goid and cheap ones with 1GSample/s and higher.
But even a digital scope needs to have a sufficiently high analog bandwidth. >= 50MHz.

2 channels at least. High voltage probes, current probes.

Klaus
 

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    sunil21

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Get decent enough memory depth too.....no point in being able to depict a super sharp rise in great detail if thats all you can see in the window........you need it to be able to remember a good length of the waveform with decent enough resolution, and show that to you.
 

Probes. Klaus has already mentioned HV and current probes.
I only would add a differential probe.

And make sure the current probe is hall-effect based. Cheaper transformer based probes have low frequency limitations. And certainly can’t display DC.
 

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    sunil21

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