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Old 6th June 2005, 03:43 AM   #11
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Hi Hienrich,

I think the equation you have devised for the gate resistors to act as low pass -filter doesnot holds good when you would came accross practical real world drive of high frequency into reactive loads especially and there may arise asituation when the both upper and lower mosfets starts to crossconduct each other....

Truly speaking when paralleling mosfets this doesnot hold good in real life encounters...

Kanwar
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Old 6th June 2005, 06:08 AM   #12
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Ultima Thule,

Eidetic was the Australian brand of amplifier I produced ( and took over the market) in Australia in 1989-1994. These were landmark performance products and swamped the performance of the big overpriced muncho amps available.

Unfortunately, I had to terminate production after threats against my young family.
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Old 6th June 2005, 12:20 PM   #13
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kanwar:

yo! I know this was not a real fact , actually I've just refered
to a circuit I've encountered and tried for myself calculating,
the results were close to each others RC time constants using
BUZ901DP's and BUZ906DP's Lateral Mosfets Ciss...

but is there an optimum ot other way to do this.?


rgrds,

macweb
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Old 7th June 2005, 09:53 AM   #14
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Quote:
Originally posted by amplifierguru


Unfortunately, I had to terminate production after threats against my young family.
Oh my GOD , I thought i was the only one on the earth with this type of situation alone.... but we havenot stopped the production in our case .... when we were new in this business ,one of our competitor's tried to threat us and what we did is something to hear... we [me, my partner , my father & lots of friends with hot blood rising up the head]simply get to his place and RamSHACKEd his house and turned down his workshop into junkyard and ofcourse force biased that guy in to thermal runaway in his bathtub and that too in legal way .....and till present that guy never showed up....thats the way we treat the fellows who mistreat with us.....He used to say"either stop your businesss or you have to face the dire consequences in both personal and professional matters" we simply showed him up what type of dire consequences he has to face .....by mistreating with us...

I really get shocked to hear about the threat to your family...



Quote:
Originally posted by hienrich
kanwar:

yo! I know this was not a real fact , actually I've just refered
to a circuit I've encountered and tried for myself calculating,
the results were close to each others RC time constants using
BUZ901DP's and BUZ906DP's Lateral Mosfets Ciss...

but is there an optimum ot other way to do this.?


rgrds,

macweb

YEs there is an optimum way exist by which one could calculate the gate resistors value... and thats in the application note of both IRF & APT ....check them out.
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Old 9th June 2005, 04:48 AM   #15
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Thanks Kanwar.

The things people do for commercial advantage over a 1/3 the price competitor!
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Old 16th November 2012, 07:37 AM   #16
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Workhorse,
I have used 220 Ohm for IRFP240/9240.

But now I want to use IRF610/9610 ...

Would 100 Ohm be a good value for the IRF610/9610?
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Old 16th November 2012, 10:49 AM   #17
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yes you can use them
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Old 16th November 2012, 05:14 PM   #18
CBS240 is offline CBS240  United States
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Consider placing a zero ~30MHz (Zobel filter) from gate to drain as close to the device leads as possible and you will be able to reduce the gate stopper. This will increase the Fc of the LP filter created by the gate stopper and the input capacitance while still being able to critically dampen the oscillator created by the mosfet internal components.
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Old 16th November 2012, 05:57 PM   #19
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Quote:
Originally Posted by CBS240 View Post
Consider placing a zero ~30MHz (Zobel filter) from gate to drain as close to the device leads as possible and you will be able to reduce the gate stopper. This will increase the Fc of the LP filter created by the gate stopper and the input capacitance while still being able to critically dampen the oscillator created by the mosfet internal components.
Shhh.. Before you know it, everyone will know the secrets of driving MOSFETs
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Old 19th November 2012, 12:28 AM   #20
CBS240 is offline CBS240  United States
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Well, it is one of those things that you have to abandon the simulator for. Simulator amps don't make much sound. The parasitics of the PCB/wiring is not so easy to model in a simulator.
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