how how will IRS get with that settings? and I also think 45ns will be too small... I don't think you can use that with those fets
Change 15V Z Diode to 12V.
Dead time : 45 ns.
Osc freq: max! 400 kHz!
Working fine.. (sorry my english)
Dead time : 45 ns.
Osc freq: max! 400 kHz!
Working fine.. (sorry my english)
Hello, IRFB4620 use transistors with dead-time 45 ns, carrier frequency 500 kHz. Zener diode, 15 volts is replaced with a 12 volt load resistor and 1.5k. Power + - 85 voluntary idling. Output power 500 watts at 4 ohms. There was, however, the following problem D5 and D6 diodes fail - drilled. I remove them or replace them with more powerful. I see that there are schemes in these diodes and circuits which are not represented. Excuse me for bad English, I use translator.
mission Impossible
Osc freq: max! 150-200 kHz! - achievable
Regards!
mission Impossible
Osc freq: max! 150-200 kHz! - achievable
Regards!
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Csahnge OCset settings:
IRFB4620 @ 30A (60mOhm) @ 25 C
High Side: Udrain+Uvf (D4) = 1.8V(60mOhm@30A) + 0.6V = 2.4V.
Trip level= 1.2V ---> R18=R19
R18= 10k
R19= 10k
Low Side:
trip level: (Idrain*RDSon) = 1.8V(60mOhm@30A)
R13 = 10k
R12 = 5.6k
Z1=Z102 = 12V
R24=R25=15 Ohm
R8! = 130k @ 85V DC
IRFB4620 @ 30A (60mOhm) @ 25 C
High Side: Udrain+Uvf (D4) = 1.8V(60mOhm@30A) + 0.6V = 2.4V.
Trip level= 1.2V ---> R18=R19
R18= 10k
R19= 10k
Low Side:
trip level: (Idrain*RDSon) = 1.8V(60mOhm@30A)
R13 = 10k
R12 = 5.6k
Z1=Z102 = 12V
R24=R25=15 Ohm
R8! = 130k @ 85V DC
Just drive into the 4227 gates with 10r resistor in series with 2092 outputs.
Adding a buffer means you can drive more mosfets and get more power.
Isn't 2092 not enough to drive 4227?
By doing that, is that stable enough to drive 4 ohm speaker and better than 4020?
I see no advantage here if using 8ohm load as this can achieve by 4020.
It only make sense with 4 ohm with >80V which means 500W++
If this build to run full bridge, 1kw into 8ohm is possible.
A bit on the dangerous side tho... 🙂
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With one pair of 4227 I can get 500 watts.
With a buffer and two pairs I can get 1000watts.
If you dont need 500watts then a lesser mosfet will do.
The 2092 will drive one pair of 4227's providing the deadtime is 105nS and you dont go above 250KHz.
I also found I had to reduce over current senstivity by a factor of 2. I just used 4k7 resistors in pairs on the CSH and OCSET inputs.
An externally hosted image should be here but it was not working when we last tested it.
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