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Hi guys,
I've got a quick question about PCB layout. I have a row of film Capacitors that need 1.7mm clearance between the two terminals (which is fine because of the size of caps I'm using) but do the casing of the caps have to be kept 1.7mm apart or can you align them a close as possible side...
Hi guys,
Following specs for transformer
primary 200-400V
secondary 24V @ 1.25A
switching frequency 333Khz
I am winding a transformer for a forward converter with a reset winding and was wondering what the best practice for winding them are (i.e is it best to interleave the primary, is it...
Im a bit unsure of the amount, basically im having issues driving tape wound core with a primary current of 20A, 140V pk at 1.5Khz-20Khz, im trying to see if there is any remnant flux or there is a case of flux walking that is pushing the core into saturation? The core is a nanoperm tape wound...
Hi guys,
I have a transformer that i want to sense the flux present over a period of time, what is the easiest way to go about this. I see that I can go down the hall effect sensor route, but im a bit unsure about how to go about it and whether it is something that i can even do without being...
The pulses get worse as the voltage increases, it tends to become more erratic and skip more pulses ad the voltage increases. I tried changing the turns ratio but a bigger turns ratio just pushes up the voltage (i.e 290V now) at which it becomes unstable, so must be a duty cycle related issue i...
I thought that hiccup mode was more associated with missing pulses or gaps in the drive waveform? This tend to be a periodic gate waveform but with long and short on time pulses is that not a feedback related issue or is this present in hiccup mode too?
Is there an easy way around reducing...
It is in current mode and I have a type 2.
Would it be by a significant amount if they were on the same rail as picture below, with the voltage loop picking off from the electrolytic point, and the load being connected across the output?
What i meant is that I have used and ohmic load and...
Hi Guys,
Im running an active clamp forward design (LT3752)
Vin 170-350V
Vout 24 @ 1.25A
For some reason at 200V input the system seems fine, as soon as the vin goes to 240V+ i seem to be getting some sub harmonic oscillation (Gate goes to small and large pulses). Now I thought this normally...
Hi guys,
I have a design that is very similar to the the one in the demo circuit as per below link
http://cds.linear.com/docs/en/demo-board-manual/dc1929afa.pdf
With my spec being
Vin-170V-350V
Vout24V @1.25A
No secondary sync used
For some reason when I put a load of 5W the voltage is...
Update: Found the issue and i think FVM called it with this, which I did think its was something to do with the clamp
For that LT part, the duty cycle on the clamp I had set to 60%, but with the main FET being at about 30% the clamp was reaching its maximum duty (at 250V in etc it was fine)
may have to invest in this book
thanks treez, probably one of the best replies ive had on the forum about a question I have asked, so I guess what you are saying is that the active clamp is more of a gimmick, rather then bringing something decent to the table? I have wondered whether this...
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