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So I found this chip in an old TV, it's a 160W power supply chip. It's a quasi-resonant switching topology regulator, and I would like to use it in my Mini Tesla Coil project. It would supply +15V and +9V, regulated at +12V and +6V for the driver board.
Problem is, is I don't know what values to use for the feedback circuit...or how to do it for that matter. The board it was attached to has a different parts layout than the schematic does. Therefore I'm not sure how I should do it...I have posted the schematic so you can see it, I put values in for known components (notes below pic)
C1 - resistor like capacitor, stripes are: red, red, brown C2 - resistor like capacitor, stripes are: brown, black, red, silver, silver R1 - ceramic capacitor like resistor, number is: 4.7 D214 (4.7 ohm power resistor?) R2 - unknown value ZD1 - unknown value
I'm not sure about that, R1 is kinda spaced by itself so I don't see the point if it was?... and I fried my meter and don't have the money right now to buy a new one
I was thinking that too, for the capacitors, but wasn't sure if they followed the same rule...
And i totally overlooked that, the FB voltage can be -0.5 to 9V, that's where the zener comes in. R2 is to set the max current flow, as the FB pin can only handle an absolute max of 10mA
My main problem is, is I don't know what values to use on the secondary side
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
Somewhere in my mess of a room is a pamphlet describing the uses of the NTC thermistors that I got. Here's a page from the company showing one being used with a transformer:
This is why, because of its location and shape, that I thought it might be a thermistor. If it's spaced by itself it might be because they get hot. Of course I can't see it though, so the final identification is yours to make. There's ways to test it without a meter, perhaps a brightness test using a battery and bulb/led. See if the brightness changes as R1 heats up.
That schematic you linked to has recommended devices for for the error amp and SI (whatever that is) so maybe if you look up those part families from Sanken you can find another application section with more about the resistor values.
I imagine the three electrolytic caps on the output are just smoothing caps, so as long as their voltage rating is high enough, the higher the capacity the better.
Hmmm, interesting, maybe it is one after all. Yeah those caps are just smoothing caps, should've said something about that. I also have googled the error amp and it just gives me links to that schematic, I was unable to find anything on them.
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STRW6735 Help
