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Class D Switching Power Amplifiers and Power D/A conversion

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Old 10th April 2013, 06:54 AM   #231
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Try saying that to the ppl that have made up their minds that class d cannot be used for anything but subwoofers.

I can agree that 200-250kHz is enough for a class d to sound good, it just feels wrong.
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Old 10th April 2013, 08:16 AM   #232
akraj is offline akraj  Bangladesh
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Originally Posted by manojtm View Post
Hi tekko,

this is not true.10 times higher than audio band is better for any good designed class d amp
so 200Khz is enough for all band. and 300KHz is max.(today's components for higher output)otherwise efficiency will be dropped.

Regards
MANOJ

Hi Manoj:
What is the relation between fsw, lc? I mean if the fewq is x what will be uH and cap value with inductor?

Thanks
Raj
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Old 11th April 2013, 02:25 PM   #233
manojtm is offline manojtm  India
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Quote:
Hi Manoj:
What is the relation between fsw, lc? I mean if the fewq is x what will be uH and cap value with inductor?
Hi Raj,

i don't understand what you ask for?

2nd order LC filter you are calculated only for cut off freq. only ; but in sigma-delta filter coil is also one of the part related to the fsw.

so fsw=300KHz to 400KHz use 18/22/33uH coil depends your speaker impedance

Regards
MANOJ
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Old 11th April 2013, 04:17 PM   #234
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Default RM 10 on aud600.

hello sir i m using RM10 on ur amp.. amp is working good.but on 110vc dc( testing ) fets geting hot .. using 23uh . i m not using 7806 i m using 7805 . is that any problem ??
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Old 11th April 2013, 06:46 PM   #235
norazmi is offline norazmi  Malaysia
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+- 110vdc?
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Old 12th April 2013, 03:35 AM   #236
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yes sir + -110v dc
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Old 12th April 2013, 07:49 AM   #237
akraj is offline akraj  Bangladesh
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Quote:
Originally Posted by aman khalsa View Post
hello sir i m using RM10 on ur amp.. amp is working good.but on 110vc dc( testing ) fets geting hot .. using 23uh . i m not using 7806 i m using 7805 . is that any problem ??
Heat might be okay, but how much?
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Old 12th April 2013, 07:51 AM   #238
akraj is offline akraj  Bangladesh
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Originally Posted by manojtm View Post
Hi Raj,

i don't understand what you ask for?

2nd order LC filter you are calculated only for cut off freq. only ; but in sigma-delta filter coil is also one of the part related to the fsw.

so fsw=300KHz to 400KHz use 18/22/33uH coil depends your speaker impedance

Regards
MANOJ
Hi Manoj, you got it right. I wanted to know at what fsw what will be the L value, C value & Spk impedance.

Is the any chat of this? Or equation?
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Old 12th April 2013, 11:40 AM   #239
manojtm is offline manojtm  India
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Hi Raj,

just you take 6R speaker load and calculate cut-off freq. IRSOUND will help you to calculate this

Regards
MANOJ
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Old 12th April 2013, 09:12 PM   #240
stewin is offline stewin  Kenya
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Quote:
Originally Posted by aman khalsa View Post
hello sir i m using RM10 on ur amp.. amp is working good.but on 110vc dc( testing ) fets geting hot .. using 23uh . i m not using 7806 i m using 7805 . is that any problem ??
which fets are you using as outputs?
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