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Old 21st March 2013, 06:23 PM   #3341
NMOS is offline NMOS  Germany
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Quote:
Originally Posted by andrewlebon View Post
Hi Manoj
greetings already amp is playing on 140 volts dc +/-
i will post pics of working amp any more powerful fets with higher rails
warm regards
andrew lebon

but IRFP23N50 is divested....

How about

IRFP4868 is only 300V but powerful


do you share your changes in AUDamp for 140 V DC
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Old 21st March 2013, 08:23 PM   #3342
PetruV is offline PetruV  Romania
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Quote:
Originally Posted by andrewlebon View Post
+40V 0v -40v / 10A SMPS For Power Amplifier post#9
Hi PetruV
greetings i have not finished the pcb layout as the core i am using is small for 130
volts dc+/- for my dclass amp if you are new to smps please make the smps from the link above i dont think there is a more EASY smps than this for first smps it can be made on
dot pcb i used IRF460 for fets 15 volts dc can be modified easier if you want so my sincere advice make this smps any help you need will be extended to you just start this smps
warm regards
andrew lebon
Thanks,i would want a smps design which is 90v 2000w or around that
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Old 23rd March 2013, 08:36 AM   #3343
PetruV is offline PetruV  Romania
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I wont be using any smps im my amp.They are too compicated im goung to use transformers
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Old 23rd March 2013, 11:09 AM   #3344
NMOS is offline NMOS  Germany
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Originally Posted by manojtm View Post
Hi NMOS,

AUD600, no issues it will start at very low signal input and no noise low temp at full drive and good sound.

Regards
MANOJ
Hi MANOJ

Im a little confused, have only REV 3.0 schematic but its not complete

can you send me the rest by email phoonpool@googlemail.com

there is Bias + and - and S

how much Volt for + and -

for what is S ?
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Old 23rd March 2013, 01:35 PM   #3345
manojtm is offline manojtm  India
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Quote:
there is Bias + and - and S

how much Volt for + and -

for what is S ?
Hi NMOS,

BIAS (+) is +12V
BIAS (-) is -VE Supply rail
BIAS (S) is OC Protect sense/signal.
Quote:
Im a little confused, have only REV 3.0 schematic but its not complete
I think you have only AMP schematic.if you need a power side schematic then i will send

Regards
MANOJ
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Old 24th March 2013, 03:34 AM   #3346
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Hello
greetings is it possible to drive more than 2 pairs of IRFP4768 from IR2010 without using totem configuration
warm regards
andrew lebon
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Old 24th March 2013, 05:37 AM   #3347
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Quote:
Originally Posted by andrewlebon View Post
Hello
greetings is it possible to drive more than 2 pairs of IRFP4768 from IR2010 without using totem configuration
warm regards
andrew lebon
No don't use it without totem pole even in 1 pair and 150kHz sw. freq, IRFP4768 has high Qg, which translates to high dissipation in mosfet gate driver. Read AN-978, there's a calculation for the approximate power dissipation for the gate drive IC.

Also IR2010 has 200V max of Voffset, "ideally" you can only run it with +-100V rails.


Regards,
Lester

Last edited by jlester87; 24th March 2013 at 05:42 AM.
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Old 24th March 2013, 08:12 AM   #3348
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Quote:
Originally Posted by jlester87 View Post
No don't use it without totem pole even in 1 pair and 150kHz sw. freq, IRFP4768 has high Qg, which translates to high dissipation in mosfet gate driver. Read AN-978, there's a calculation for the approximate power dissipation for the gate drive IC.

Also IR2010 has 200V max of Voffset, "ideally" you can only run it with +-100V rails.


Regards,
Lester

Some PA Manufacturer using IR2010 and drive 2 pair IRFP250N without totem pole. Does it mean this design is not good ?


How about IR2110 driving without totem pole 1 pair FDP51N25 or 2 pair IRFP 250n is it possibile with 400 khz ?
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Old 24th March 2013, 08:14 AM   #3349
NMOS is offline NMOS  Germany
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Quote:
Originally Posted by manojtm View Post
Hi NMOS,

BIAS (+) is +12V
BIAS (-) is -VE Supply rail
BIAS (S) is OC Protect sense/signal.


I think you have only AMP schematic.if you need a power side schematic then i will send

Regards
MANOJ

Yes I need power side schematic. Can you share and send by email to

phoonpool@googlemail.com ?

Thanks and best regards
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Old 24th March 2013, 08:31 AM   #3350
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Quote:
Originally Posted by NMOS View Post
Some PA Manufacturer using IR2010 and drive 2 pair IRFP250N without totem pole. Does it mean this design is not good ?


How about IR2110 driving without totem pole 1 pair FDP51N25 or 2 pair IRFP 250n is it possibile with 400 khz ?
Qg, gate resistor and switching frequency primarily determines the dissipation. As long as the junction temp of the driver IC is maintained below 125 deg C, I think there wouldn't be a problem.
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