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dimmer RFI

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hrc

Electrical
Nov 8, 2001
104
From some of the tech notes I've seen, typically the RFI filter on the dimmed side of the triac is just a 100uH choke, nothing else too special other than to ensure it isnt saturated.

Also there appears to be a snubber of some type often used as well, but if I use a 'snubberless' triac, such as a STmicro BTA08, would i still need the .47uF and 2K resistor? Is that part of the RFI circuit? I don't believe it is, just acts as a snubber on the output.
 
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And...forgot to add....looking for the smallest possible choke, surface mount preferred, saturation of 8A
 
ST has an app note at their website on their snubberless Triacs (you have to dig to find it). They don't claim you can eliminate the snubber and it's probably a bad idea in the real world especially if the load is remote from the Triac. They also show spike catchers.
 
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