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Old 9th April 2013, 03:33 AM   #1
ridikas is offline ridikas  United States
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Default Better way of installing gate stopper resistors?

Please take a look at the picture. Is the top example a better method? And why?
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Old 9th April 2013, 04:49 AM   #2
Jay is offline Jay  Indonesia
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My take on this issue is that it is not too important to bother with.

More resistor means more money and probably noise. But may be easier to match between P and N channels by changing only the first resistor in paralleled mosfets.

I prefer to bother with as close as possible track. The gate stopper right on the gate pin. Even the "correct" value of the resistor is more important to bother with (which I still don't really care anyway)
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Old 9th April 2013, 12:10 PM   #3
AndrewT is offline AndrewT  Scotland
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Originally Posted by Jay View Post
................ The gate stopper right on the gate pin. ..........
This is wisdom of this Forum.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 9th April 2013, 05:26 PM   #4
CBS240 is offline CBS240  United States
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A RC zero is much more effective in controlling the active resonance circuit, that being the mosfet and it's internal components. The combination of gate stopper resistor and a gate Zobel from gate to drain along with local high frequency decoupling such as a 100nf film cap from drain to GND will prevent mosfet instability regarding transient output current. As stated these components should be as close to the device as possible, as should any Vgs Zener protection.

IOW niether of those drawings is optimal.
All the trouble I've ever been in started out as fun......

Last edited by CBS240; 9th April 2013 at 05:28 PM.
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