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Old 19th September 2013, 07:12 PM   #11
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you're probably fooled by your oscilloscope. If the rising and falling edge are the same I think this is the problem.

But to be sure. increase you gate resistor. you have to see a change. (22R is already a significant value)

hope this helps.
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Old 20th September 2013, 01:34 AM   #12
DUG is offline DUG  Canada
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Lower or raise the gate resistors by a factor of 2 and see if there is a change.

Just noticed post # 11

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Last edited by DUG; 20th September 2013 at 01:35 AM. Reason: Just noticed post # 11
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Old 20th September 2013, 05:58 AM   #13
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Hy Shahin,in my IRS2092 amps, I use heavy snubering 680pF...1nF+27R/2W and I get allmost perfect PWM between the fets.I also use many 1uF/100V X7R across +->GND right next to fets (IRFB5615/IRFB5620) and GND-> - and right at the fets legs to GND SWF 400Khz .Great Sound
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Old 21st September 2013, 06:55 AM   #14
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Quote:
Originally Posted by ionutzxpo View Post
Hy Shahin,in my IRS2092 amps, I use heavy snubering 680pF...1nF+27R/2W and I get allmost perfect PWM between the fets.I also use many 1uF/100V X7R across +->GND right next to fets (IRFB5615/IRFB5620) and GND-> - and right at the fets legs to GND SWF 400Khz .Great Sound
For a halve bridge, snubbering shouldn't be needed. Control you're FET rise and fall time with the gate resistor network. Slow on, fast off this will solve the problem.
Play around with LTspice.

For the good order this is a different problem.
ringing on the gate is mainly caused by Cgs.

and ringing on the leg of the halve bridge is caused by Cds and the inductor.

In a bridge configuration lowing the V/dt solve both problems. except if the Cds is really large. Then use a small snubber. But better find better mosfets. trade Rdson, for a lower Cds.
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