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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 February 2011, 08:17 PM   #881
ChocoHolic is offline ChocoHolic  Germany
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Quote:
Originally Posted by paul14 View Post
For this pcb, does anyone has a photo with the arrangement of parts?...a layout or something like that. I don`t wanna waste too much time on finding right place to each part......

And IRFP250 is a good choice?
If you work with voltages below +/-60V, then IRF250 and IRF250N are not a good choice. Unnecessary high voltage rating and you pay for this unnecessary property the price of a high gate charge and a poor body diode.
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Old 24th February 2011, 08:22 PM   #882
ChocoHolic is offline ChocoHolic  Germany
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Note:
Especially the IRFP250 without N is a device from ice age.
Catastrophic body diode.
IMHO a device which should be avoided for class D in 2011.
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Old 25th February 2011, 08:46 AM   #883
stewin is offline stewin  Kenya
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hi chocoholic
Quote:
Originally Posted by ChocoHolic View Post
Note:
Especially the IRFP250 without N is a device from ice age.
Catastrophic body diode.
IMHO a device which should be avoided for class D in 2011.
what about irfp260p
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Old 25th February 2011, 10:06 AM   #884
Pafi is offline Pafi  Hungary
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Is that exists? I found only IRFP260PBF. PBF means it doesn't contain lead (Pb).
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Old 25th February 2011, 10:37 AM   #885
paul14 is offline paul14  Romania
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Quote:
Originally Posted by ChocoHolic View Post
If you work with voltages below +/-60V, then IRF250 and IRF250N are not a good choice. Unnecessary high voltage rating and you pay for this unnecessary property the price of a high gate charge and a poor body diode.
Then what do you recommend? Something not very expensive if is possible.
I`m going to work with +/- 40-50v
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Old 25th February 2011, 11:15 AM   #886
Pafi is offline Pafi  Hungary
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For up to +/-45V: IRF540N (IRF540Z is better, if you find it)
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Old 25th February 2011, 11:21 AM   #887
paul14 is offline paul14  Romania
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It`s quite cheap irf540z, about 1euro.
And for +/-50v?
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Old 25th February 2011, 12:51 PM   #888
norazmi is offline norazmi  Malaysia
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i have with me, irf4710, irf3415, irfb4615 and irfb33n15b, which one is better?

regards,
Azmi
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Old 25th February 2011, 12:54 PM   #889
norazmi is offline norazmi  Malaysia
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+/- 50 for irf540z and irf540n is absolute maximum rating, i`ll not use that rails, i`ll go with pafi recommended +- 45 vdc.
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Old 25th February 2011, 12:58 PM   #890
paul14 is offline paul14  Romania
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I know that +/-50v is maximum for irf540z, but my power supply will have +/-50v. That`s why i asked for another mosfet..
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