OK, you took a leap and ordered some😉 the least I can do is develop some models based on the specification data.
Maybe we can tune it later based on actual measurements.
It will take a little while, I need to study a bit, when are they due?
Best wishes
David
VI Limiters in Amplifiers
Not this test.
But this one does show the high voltage back emf when an inductive load is suddenly cut off.
The back emf peaks can be limited to just above the supply rails by adding in the output to supply rail protection diodes.
Test2 might be the same as I saw elsewhere.
They talk about reading the height of the scope pulse to arrive at the current limit set by the IV limiter.
Not this test.
But this one does show the high voltage back emf when an inductive load is suddenly cut off.
The back emf peaks can be limited to just above the supply rails by adding in the output to supply rail protection diodes.
Test2 might be the same as I saw elsewhere.
They talk about reading the height of the scope pulse to arrive at the current limit set by the IV limiter.
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IXYS models -!..
I'm on it, not so hard after all, well before the weekend.
Best wishes
David
Toni, have you ever experimented with a Zobel from gate to source in lieu of a gate stopper resistor? As described by Cordell...
Yes, have used this RC snubbers with the EXC10[NP]20 to stop the oscillations. AFAIK there was a picture in this thread showing them. Helped a little bit but didn't cure the oscillations. Using the gate/drain snubbers may help to further decrease the gate resistors but I felt uncomfortable doing so.
BR, Toni
I have used gate/drain snubbers. Just now I saw Bob Cordell used gate/gnd snubbers in his MOSFET amp (Fig. 12 on page 11 in http://www.cordellaudio.com/papers/MOSFET_Power_Amp.pdf).
But whats wrong or correct?
Should do another test using gate/gnd snubbers ...
BR, Toni
But whats wrong or correct?
Should do another test using gate/gnd snubbers ...
BR, Toni
is it a snubber or more like a low pass filter?
What about a gate stopper and an RC snubber (tapped off before the stopper) to the drain?
and kills the speed of the MOSFET and hence the discussion of Zobel's from gate to drain as alternatives
I will try to find the page number
EDIT correcting to change "source" to "drain"
I will try to find the page number
EDIT correcting to change "source" to "drain"
maybe something like this ? http://www.farnell.com/datasheets/1322275.pdf?_ga=1.171008998.798805641.1483584410
i googled up others and seems like 100-200R at 10Mhz is the kind of impedance that they provide. Potentially meaningful in the context of a few hundred ohms gate stopper resistors. Have never tried them myself.
i googled up others and seems like 100-200R at 10Mhz is the kind of impedance that they provide. Potentially meaningful in the context of a few hundred ohms gate stopper resistors. Have never tried them myself.
What is a good source for toroid transformer, rectifier bridges and electr. capacitors 10000 or 22000 uF 63 V in the Netherlands?
Some well known vendors: Mouser, Farnell, Conrad, TME, Distrelec, Digikey, Reichelt.
The big lytics are harder to get today ...
BR, Toni
As being within the EU also, you can easily order toroids at reasonable prices and without customs duties from Polish manufacturers. Some of them even accept custom orders.
Best regards!
Best regards!
Is Epcos any good a brand for Capacitor. Or should it be BHC or Panasonic?
What rectifier bridge do you recommend, schottky or regular?