SystemD_2kW, any interest for an open design? - Page 4 - diyAudio
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Class D Switching Power Amplifiers and Power D/A conversion

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Old 25th November 2012, 07:26 PM   #31
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Basically such circuit is fitting to my taste.
From stomach I felt that it might not be accurate enough, that's why my head moved to the precision circuit.
But you are 100% right, never overcomplicate a circuit if not needed. I will recheck.
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Old 25th November 2012, 08:24 PM   #32
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Something happened to LM360.
All my typical sources do not sell it anymore.
And it seems like TI killed the DIP version.... Grrrrr

Why didn't TI ask me if I agree on their portfolio cleaning after they bought National?!?

...search of an easily available and reasonably fast comparator (but not unsaint high end speed!!!) with output stage that can sink and source is reopened.
My personal focus would be a propagation delay between 15ns...30ns.
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Old 25th November 2012, 10:32 PM   #33
pergo is offline pergo  Italy
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some DIP comparators with <30ns propagation delay
The first is the cheapest.

LM306
AD8561
LT1016
MAX903
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Old 26th November 2012, 05:34 AM   #34
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What about LM361......???

Its good for use with opamp +/-15V supplies.
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Old 26th November 2012, 07:14 AM   #35
manojtm is offline manojtm  India
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Quote:
This and the monologue of my last thread is telling me that there is just little interest in class D DIY.
Also it tells me that there are around 20 knowledgeable class D freaks watching the thread, but not willing to share anything, because of the 280 CopyCats that lurk around the thread in silent spy mode .
In history there have always been these technically ignorant guys who only want to suck&sell the design, but it is sad they became powerful enough to kill the DIY-spirit in the class D section.
Hi Choco,

yes you said it.

i will help you to design a good class d.for IRFP4668 with 400KHz you need a huge current to drive this.don't go with totem-pole and IR2110 it will create more noise.
it is my suggestion only don't feel bad.

Regards
MANOJ

Last edited by manojtm; 26th November 2012 at 07:17 AM.
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Old 26th November 2012, 07:19 AM   #36
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Quote:
Originally Posted by manojtm View Post
don't go with totem-pole and IR2110 it will create more noise.
Regards
MANOJ
How can you say that Totem pole creates noise?
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Old 26th November 2012, 07:41 AM   #37
manojtm is offline manojtm  India
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Quote:
How can you say that Totem pole creates noise?
Hi workhorse,

i am not argue this . did you try 400KHz with totem pole BJT (BD139/140) drive. practically i feel it is bad c'use of not getting good switching BJTs.

Regards
MANOJ
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Old 26th November 2012, 07:53 AM   #38
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Quote:
Originally Posted by manojtm View Post
Hi workhorse,

i am not argue this . did you try 400KHz with totem pole BJT (BD139/140) drive. practically i feel it is bad c'use of not getting good switching BJTs.

Regards
MANOJ
I have driven a pair of IRFP4768 @450khz with Totem poles without any issues.
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Old 26th November 2012, 08:10 AM   #39
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Quote:
Originally Posted by manojtm View Post
Hi workhorse,

i am not argue this . did you try 400KHz with totem pole BJT (BD139/140) drive. practically i feel it is bad c'use of not getting good switching BJTs.

Regards
MANOJ
BD139/140 are not good enough for high speed switching, there are much better devices available.
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Old 26th November 2012, 08:17 AM   #40
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Default totem transistors

BD139/140 are not good enough for high speed switching, there are much better devices available.

Hi Woorkhorse
greetings can you reccomend any transistors for high speed switching for totem configuration just tested totem with BD139 BD140
i have zetex ztx751 ztx651 with me
warm regards
andrew
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