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Class D Switching Power Amplifiers and Power D/A conversion

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Old 28th February 2013, 05:18 AM   #161
akraj is offline akraj  Bangladesh
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Quote:
Originally Posted by manojtm View Post
Hi, ALL

pls comment

Regards
MANOJ
This is very cleaver design. However, mounting in box may be difficult. What is the rail voltage? and what FET you are using?

Thanks
Raj
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Old 28th February 2013, 08:28 AM   #162
manojtm is offline manojtm  India
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Quote:
This is very cleaver design. However, mounting in box may be difficult. What is the rail voltage? and what FET you are using?
Hi Raj,

Vertically mounting. 5mm thick aluminium and 3 inch Hight,6.5 inch length
+/-75V 10A DC rail and FET used IRFP250N fsw@250KHz. OC protect @18A

Regards
MANOJ
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Old 28th February 2013, 08:57 AM   #163
akraj is offline akraj  Bangladesh
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Quote:
Originally Posted by manojtm View Post
Hi Raj,

Vertically mounting. 5mm thick aluminium and 3 inch Hight,6.5 inch length
+/-75V 10A DC rail and FET used IRFP250N fsw@250KHz. OC protect @18A

Regards
MANOJ
Hi Manoj:

Is this version 3.0? So far I can recall your latest design was calibrated to work 500KHz.

Thanks
Raj
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Old 28th February 2013, 09:53 AM   #164
manojtm is offline manojtm  India
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Quote:
Is this version 3.0? So far I can recall your latest design was calibrated to work 500KHz.
Hi Raj,

yes ver 1.2 PCB and modified to ver 3.0
you can go up to 480KHz for this you need a good mosfet. i like 200-250KHz range it is good for old generation MOSFETs without any problem.

Regards
MANOJ
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Old 28th February 2013, 10:58 AM   #165
akraj is offline akraj  Bangladesh
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Quote:
Originally Posted by manojtm View Post
Hi Raj,

yes ver 1.2 PCB and modified to ver 3.0
you can go up to 480KHz for this you need a good mosfet. i like 200-250KHz range it is good for old generation MOSFETs without any problem.

Regards
MANOJ
Hi Manoj:

Can I use TL074 instead if 072&071? It will save pcb space and another free opamp can be used for protection.

Another issue, is it possible to replace 7404 & 555 with a micro controller?

Your comments are highly appreciated.

Thanks
Raj
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Old 28th February 2013, 06:14 PM   #166
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Hi raj
i think micro controler is not fast enofe for porotection
CPX say to me this before
in class D amp we need a way that must be very fast to shutdown the mosfet driver IC and mosfets
sir manoj can help to you beter
have nice time my friend
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Old 28th February 2013, 06:35 PM   #167
akraj is offline akraj  Bangladesh
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Quote:
Originally Posted by Hadighorbani View Post
Hi raj
i think micro controler is not fast enofe for porotection
CPX say to me this before
in class D amp we need a way that must be very fast to shutdown the mosfet driver IC and mosfets
sir manoj can help to you beter
have nice time my friend
After a long time Hadi!

Thanks for your reply. I was just wondering why an uC running @20MHz is not fast enough! to protect / trigger OC?

Besides, uC can also detect DC volts at Spk line without much component. This can be very good if uC is able to serve those purposes.

Thanks
Raj
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Old 1st March 2013, 04:24 AM   #168
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hi my friend
i am so busy and i have many work for doing in my factory in last days off year
i am not electronic man
my best net friend CPX sayed to me the micro controler can not be fast enofe for doing protected
the dc voltage in amp out put is diferent voltage
some time 1 volt and some time 15 volt
new xmega can work with 3 volts and old 5 volts
what about AC volt in output of amp?
micro maybe damage
i dont test this before
i say before sir manoj can help you beter than me
have good day and do your job good and dont search the net bad boy when you are in work

Last edited by Hadighorbani; 1st March 2013 at 04:26 AM.
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Old 1st March 2013, 09:32 AM   #169
manojtm is offline manojtm  India
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Quote:
Can I use TL074 instead if 072&071? It will save pcb space and another free opamp can be used for protection.

Another issue, is it possible to replace 7404 & 555 with a micro controller?
Hi Raj,

You cannot replace comparator(7404) with micro but you can use micro for DC,OC & TEMP protect,, ALC(limitter) also.

Regards
MANOJ
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Old 1st March 2013, 09:59 AM   #170
akraj is offline akraj  Bangladesh
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Join Date: Nov 2010
Quote:
Originally Posted by manojtm View Post
Hi Raj,

You cannot replace comparator(7404) with micro but you can use micro for DC,OC & TEMP protect,, ALC(limitter) also.

Regards
MANOJ
Thanks Manoj.

Can I use TL074 to replace 072&071?

Thanks
Raj
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