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i got a question though. why have written that i need 100uF bootstrap capacitor in one of the pictures?
the switch voltage (yellow) and the diode voltage (blue).
the duty cycle/gate (yellow) and the output voltage (blue)
i'm sorry. because of the limited supplies that's the reason why i did...
the bootstrap capacitor i'm using now is 100uF. it seems to be ok :)
for the output capacitor...
whenever i put any kind of capacitor at the output, this waveform will form
but without any output capacitor, the output will be so the average output voltage and current will be less.
-voltage...
ok..
what about the 100uF? i've been using 1uF, is that not large enough, would that be better if i get a larger one than 100uF?
if i were to apply dead time, it should be at the IC 494 right?
i'm powering 7 LEDs. i think it's not really a heavy load..
i tried lowering the frequency. i could...
sorry for asking, but why need the precaution?
yes i always check whether if the IGBT or diode is heating up or not. i'm so afraid that they'll damage as i only have a few more left. the waveform of the diode voltage (top/yellow) and the voltage across the switch (below/blue) is as below...
i think that's probably it. that's why i think i'm gonna go get the mosfet goldsmith suggested me.
i'm pretty bumped out because it works perfectly in the beginning. now that it's near submission, it decides to fail me :-(
anyway, have you ever tried them practically?
thanks for explaining. i have several questions though. the calculated values are all minimum right? because i'm using 2mH and 22uF. that serves as a fillter, so my output should then have less ripple right? please correct me if i'm wrong.
i did capture several waveforms and i would like to ask...
the design initially was suppose to carry out 240Vac and be rectified to the buck converter. but i have to scrap that when the sync buck wasn't working. (but it was perfectly fine the first week of testing, i wonder what happened). i guess that IGBT was appropriate for that.
i am familiar a bit...
the aim is for good efficiency right?
the IGBT i used for both switches for sync operation has anti parallel diode in it. i'm using this one. https://www.farnell.com/datasheets/34686.pdf
i did try the conventional buck converter yesterday.
but i fail to understand the reason why (i used an...
this is the schematic...
how can i apply dead time?
there are several mistakes when drawing the schematic. but i corrected it when applying on the board.
hi everyone..
i did post a lot here regarding the same project. sync buck converter for LED driver. initially, the circuit provided very good results.
but after a long time of testing and trying to change this ad that every now and then, the buck converter now won't work. both the IGBT's signal...
Hi,
I'm new to the TL494 and i'm using it for a buck converter. So, basically i'm using it for the IGBT. I've tried carrying out the circuit given in the datasheets (for tl494) at http://www.datasheetcatalog.org/datasheet/texasinstruments/tl494.pdf
can anyone share how the test inputs (pin 3...
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