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Registered Member #3546
Joined: Tue Dec 28 2010, 08:24AM
Location: Pittsburgh, PA
Posts: 18
Does anybody know of some good resources to learn about the tl494 and other pulse width modulating circuits? I had asked one of my professors if he could show me what he knows about them, but he mostly just blew me off and told me to mess with them until I get what I want, but I haven't been having much luck with it. I've read both the data sheets and the application notes already too. Honestly, I am a little worried all the tl494's I bought might be damaged because I can't seem to get the saw-tooth waveform from pin 6 to show up on my scope when I build the test circuit in the data sheet.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I remember asking the lecturer on my Power Electronics course a similar question. At least he was honest, and admitted that he didn't know anything about the TL494.
The TI datasheet is terrible, try to find one of the other manufacturers' datasheets, like OnSemi.
The test circuit doesn't necessarily do what you think. It is just a description of the test jig used in the maker's lab that was used to measure the specifications on the datasheet, not an actual application circuit.
I assume you have a proper X10 probe on your scope, not a length of coax with alligator clips on the end.
Registered Member #3610
Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
These should get you started.
In my experience, the chips are pretty tough. Also good is that they're dirt cheap and easy to find since the majority of AT and ATX computer PSUs used them or equivalents.
Just connecting power and a timing capacitor and resistor ought to get the oscillator running and give you a sawtooth.
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tl494
