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Class D Switching Power Amplifiers and Power D/A conversion

ucd 25 watts to 1200 watts using 2 mosfets
ucd 25 watts to 1200 watts using 2 mosfets
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Old 24th April 2017, 09:28 PM   #4591
stewin is offline stewin  Kenya
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Quote:
Originally Posted by radokely View Post
hello....i've tried this amp and it work perfectly at +/-30V but at +/-80 the IR2110 has been killed....my questiom is....what kind of protection should i put...thank for reply and sorry for my
english
also remove the 12volts zeener diode between vb and vs pins of ir2110 ,if there is any zeener diodes connected
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Old 27th April 2017, 12:01 PM   #4592
kees52 is offline kees52  Netherlands
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Location: Sprang-capelle Holland.
Maybe the use of a hexfred mosfet is a idea, these mosfets are made for extreme fast switching and low on resistance of 0.18 ohm.

These are used in resonance weld inverters and as such quite interesting.

http://www.mouser.com/ds/2/523/APT56...L_C-603107.pdf

regards
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Old 29th April 2017, 05:52 AM   #4593
ionutzxpo is offline ionutzxpo  Romania
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In class D a Trr of more than 100ns is a NO-GO! Only if you what no more than 100khz switching freq.
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Old 29th June 2017, 06:13 AM   #4594
kirubakaran is offline kirubakaran  India
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Default Stuck with irs3000

hi,
Greetings,
pls any one can solve my prob?...

am stuck with irs3000 last Few days,
its kill gate driver within 1 sec every time i will check all outputs and changed,
but no sucess.
before i will make success this amp many time with 55 Rail voltage, but now am stuck.

rail voltage 65, output irfp250, 22uh Yellow/Red t-157 core, gate resistor 47E,
Frequency is 250khz. 15v bias supply.
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Old 29th June 2017, 11:32 AM   #4595
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by ionutzxpo View Post
In class D a Trr of more than 100ns is a NO-GO! Only if you what no more than 100khz switching freq.
You do refere to the hexfred mosfet? yes these are offtime 190 nS and has 11 nF gate capacitance, so no these are not usable, I however can use them for a smps supply for the hybrid amp.

regards
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Old 29th June 2017, 11:54 AM   #4596
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by ionutzxpo View Post
In class D a Trr of more than 100ns is a NO-GO! Only if you what no more than 100khz switching freq.
Then these mosfets are better, as I see very fast also and different houses.


https://www.google.nl/url?sa=t&rct=j...1jNapg&cad=rja

or even faster 200 volts 84 ampere. to220

https://www.infineon.com/dgdl/Infine...440c77d8950149

For killing a IR2011, look at parasitics, and maybe use a suppressing diode on the supply pin(s) of that ic, do not use a zener, but a fast scottky diode.

Last edited by kees52; 29th June 2017 at 12:14 PM.
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Old 29th June 2017, 03:59 PM   #4597
Dinithm is offline Dinithm  Sri Lanka
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Location: Gampaha
Quote:
Originally Posted by kirubakaran View Post
hi,
Greetings,
pls any one can solve my prob?...

am stuck with irs3000 last Few days,
its kill gate driver within 1 sec every time i will check all outputs and changed,
but no sucess.
before i will make success this amp many time with 55 Rail voltage, but now am stuck.

rail voltage 65, output irfp250, 22uh Yellow/Red t-157 core, gate resistor 47E,
Frequency is 250khz. 15v bias supply.
1.set modulation frequency 100khz
2.power up the amplifier
3.check IR2110 temperature
4.then increase the modulation frequency,slowly (using frequency setting potensiometer)
till IR2110 temperature 55c' - 60c'
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Old 30th June 2017, 03:06 PM   #4598
kees52 is offline kees52  Netherlands
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Did you guys tri sic mosfets? these are very fast, like 14-24 49 nS for 90 amps version, but needs a special driver as I did read, needs -2 to -5 bias voltage and 20 volts gate drive, these are as such complicated?

But in sim I get pretty low distortions, even on 8 amps 4 ohms.

with 1.4 amps output it is very very low, for simplicity there is not yet a proper dead time.

The feed forward network on output is quite nice to recover fase behavior for stable oscillation and frequenty setup together with the low pass opamp in input, I did read this stuff and have now sim it, I go try also with the IR 2011S chip, that way I can make better pcb with lower parasitics..

regards
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Old 2nd July 2017, 12:36 PM   #4599
ionutzxpo is offline ionutzxpo  Romania
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Hello kees52, can you post the .asc simulation file?
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Old 2nd July 2017, 03:31 PM   #4600
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by ionutzxpo View Post
Hello kees52, can you post the .asc simulation file?
You mean the amps schematic itself?
Attached Files
File Type: zip digital D-amp-sicmosfet.zip (4.0 KB, 308 views)
File Type: zip modlelfile-cmp folder.zip (366.6 KB, 266 views)

Last edited by kees52; 2nd July 2017 at 03:35 PM.
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