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4hv.org :: Forums :: General Science and Electronics
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What is test inputs on tl494

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ubuntupokemoninc
Sat Dec 25 2010, 10:35PM Print
ubuntupokemoninc Banned on 1/22/2011 for repeated rule violations after multiple warnings.
Registered Member #3299 Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
I'm designing a circuit, Link2 is the base of the circuit and it says test Input, is that pulse width modulation? I don't need pulse width modulation, so do i just not put anything there?
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cjk2
Sat Dec 25 2010, 10:49PM
cjk2 Registered Member #51 Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
Ground the Dead time control (I think) and apply a variable voltage to the feedback pin to vary output duty cycle.
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ubuntupokemoninc
Sat Dec 25 2010, 11:31PM
ubuntupokemoninc Banned on 1/22/2011 for repeated rule violations after multiple warnings.
Registered Member #3299 Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
how much do I vary it? the values i'm putting in to the circuit will make the chip run at 110khz, then it will be interrupted with a 555 chip.
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Adam Munich
Sun Dec 26 2010, 01:30AM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
"make the chip run at 110khz, then it will be interrupted with a 555 chip"

Is this for a plasma speaker, or an audio modulated tesla coil? The sg3525 does an excellent job at audio modulation.
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ubuntupokemoninc
Sun Dec 26 2010, 02:24AM
ubuntupokemoninc Banned on 1/22/2011 for repeated rule violations after multiple warnings.
Registered Member #3299 Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
Its for a drsstc wink
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Adam Munich
Sun Dec 26 2010, 02:27AM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I'd just use the SG3525 then. It's easy to make a half bridge with it, and it runs fine at 110khz.
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ubuntupokemoninc
Sun Dec 26 2010, 03:10AM
ubuntupokemoninc Banned on 1/22/2011 for repeated rule violations after multiple warnings.
Registered Member #3299 Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
Man i already have the circuit made, and i have all the parts for the tl494 lying around
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