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Class D Switching Power Amplifiers and Power D/A conversion

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Old 1st February 2013, 09:09 AM   #291
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Hi sir apex
if you change any thing in your D200 amp please share that to me.
why was my D200 not worked ?
may be my part quality is very bad! is this my problem in D200 ?
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Old 1st February 2013, 02:21 PM   #292
IRSound is offline IRSound  Germany
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Hi Manoj,

Thanks for your guides , you always learn me important things. thanks about that.
so , the problem is level shifter. also the output noise before oscillation ?

I'm working on irs1500 , it have 2K resistor at input of comparator.
look at attached image. i should change those 4K7 and 6K8 ? how do you find those values ?

why detex didn't solve this problem before ?!

Regards,
IRSound
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Old 1st February 2013, 04:40 PM   #293
IRSound is offline IRSound  Germany
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I change those resistor with 10K and 1.5K. but the noise changed to another form.
then I add a 68K resistor between VDD and VS (before filter) , problems solved. everything seems ok , what you think Manoj ? is it ok to put this resistor ?

Regards
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Old 1st February 2013, 07:32 PM   #294
IRSound is offline IRSound  Germany
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sorry ,
the problem is still available. that resistor i think make some problem for high side section..high side mosfet gets warm..also bootstrap diode and capacitor. so i remove them..

but with 1.5K and 10K amp not oscillate. it makes some noise before applying more input level to amp. so i just don't know what should i do !!
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Old 2nd February 2013, 05:12 AM   #295
manojtm is offline manojtm  India
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Hi IR,

level shifter changes for CD4049 only not for 74HC series and use more stage inverter buffer to get good square wave shape. use good output filter(T106-2)

or use 74HC14 series

amp will oscillate only your level shifter is good, oscillate only after input signal then your level shifter near to the good point.

Regards
MANOJ

Last edited by manojtm; 2nd February 2013 at 05:17 AM.
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Old 2nd February 2013, 08:24 AM   #296
IRSound is offline IRSound  Germany
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Hi Manoj,

i'm using 4049 , i change 6K8 with 10K and 4K7 with 1K5.
now , when i apply power to amp , a noise appear at the output just like before but with another form. something like amp is near to oscillate. when i apply input with higher input , problem solved.

how about changing that 1K5 resistor with lower values ?

Regards
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Old 2nd February 2013, 09:43 AM   #297
manojtm is offline manojtm  India
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Hi IR,

i will give my AUD600 Rev 3.0 schematic and you do what i did in feedback side, level shift and inverter side.

give me your mail ID

Regards
MANOJ
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Old 2nd February 2013, 09:46 AM   #298
manojtm is offline manojtm  India
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Quote:
how about changing that 1K5 resistor with lower values ?
Hi IR,

yes decrease to 1K value max.

Regards
MANOJ
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Old 2nd February 2013, 01:12 PM   #299
IRSound is offline IRSound  Germany
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Hi Manoj,

look at this :

Quote:
manojtm has exceeded their stored private messages quota and cannot accept further messages until they clear some space.
Regards
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Old 3rd February 2013, 04:12 AM   #300
NMOS is offline NMOS  Germany
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Quote:
Originally Posted by manojtm View Post
Hi IR,

i will give my AUD600 Rev 3.0 schematic and you do what i did in feedback side, level shift and inverter side.

give me your mail ID

Regards
MANOJ

Can I get AUD 3.0 schematic too

my email: phoonpool@googlemail.com
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