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Class D Switching Power Amplifiers and Power D/A conversion

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Old 21st November 2012, 05:52 AM   #2911
manojtm is offline manojtm  India
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Quote:
i can find 330 and 370 uH self
can i reaplace them with 220 uH ?
i can not find 6.3 V zener diod. i use 6.2V zener. is this ok ?
what about the gap ?
Hi Hadi,

use min. 22uH and Max.220uH for reducing emi and AC50Hz line noise.(recommended 68uH)
ok use zener 6.2V
1mm gap all
why you are waiting for 1K 1% resistor for testing use 1K 5% one

regards
MANOJ
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Old 21st November 2012, 06:00 AM   #2912
manojtm is offline manojtm  India
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Quote:
aud600 vs irs900d

hi manoj . your amp has many components compared to irs900 . is there any advantage in terms of noise or thd over the irs 900d?
Hi stewin,

all are self osc.(delta sigma modulation) type class d. my design is low emi and low noise one

Regards
Manoj
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Old 21st November 2012, 06:24 AM   #2913
manojtm is offline manojtm  India
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Quote:
thd over the irs 900d?
Hi stewin,

for low THD use MOSFET 70/100nc one gate resistor use recommended the manufacturer

use fsw = 400KHz/450KHz to get smooth sine wave (that will reduce filter size and capacitor value)do not compare with 250KHz range.

for class d start with 80KHz to 500KHz.(new generation MOSFET) for 100KHz use big filter ie. @300uH and big capacitor ie. 30uF/250V to reduce noise and wave shape comparatively good
fsw = 400KHz filter @22uH capacitor 0.47uF/2250V to achieve this you need good PCB, supported MOSFET, good filter and components.

for DIYs start with 125KHz (it is easy) and try with 250KHz switching(not easy)
My design you can go up to 400KHz range

Regards
MANOJ
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Old 21st November 2012, 06:52 AM   #2914
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ok
i use 1k 5%
gap must be just in center leg or all ?
i have 170uH
can i use for all self ?
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Old 21st November 2012, 07:46 AM   #2915
manojtm is offline manojtm  India
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Quote:
ok
i use 1k 5%
gap must be just in center leg or all ?
i have 170uH
can i use for all self ?
Hi Hadi,

all leg 1mm gap
regards
manoj
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Old 21st November 2012, 08:07 AM   #2916
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can i use 170 uH for all self ?
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Old 21st November 2012, 08:16 AM   #2917
manojtm is offline manojtm  India
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Quote:
can i use 170 uH for all self ?
Hi hadi,

for output filter ? No. for fsw=@250KHz use max 90uH. good 62uH or 70uH

fsw=@180KHz or 150KHz you can use 170uH filter
for DC filter yes you can use 170uH
Regards
MANOJ

Last edited by manojtm; 21st November 2012 at 08:18 AM.
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Old 21st November 2012, 08:25 AM   #2918
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you use 3 pcs 220uH 1/4w self in your pcb
one in power and two in amp.
i was said can i replace 170uH with 220uH in your board ?
thanks
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Old 21st November 2012, 08:26 AM   #2919
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what is this meaning?
( the speakers should also be connected in anti-phase )
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Old 21st November 2012, 11:30 AM   #2920
manojtm is offline manojtm  India
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Quote:
you use 3 pcs 220uH 1/4w self in your pcb
one in power and two in amp.
i was said can i replace 170uH with 220uH in your board ?
thanks
Hi hadi,
3 x 220uH for DC filtering(AC 50Hz and EMI filter).

Regards
MANOJ
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