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Class D Switching Power Amplifiers and Power D/A conversion

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Old 12th December 2012, 06:17 AM   #3021
stewin is offline stewin  Kenya
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Quote:
Originally Posted by andrewlebon View Post
HI Stewin
greetings 80 volts dc +/- used with IRFP260N
warm regards
andrew
in my irs900d the ir2110 ic heats up , until i have placed a heatsink on top of the ic with superglue.

i have two channels and i am using one adapter of 12vlts to serve both channels .

but i have no noise issues and the amp is clear . the main voltage is +/-45vlts gate resistors are 100ohms output fets are irfp250n they are cool even though i have not mounted them on a heat sink. when i push the amp real hard at that voltage the outputs only warm up a little.

i will juice it up to +/- 80vlts
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File Type: jpg ucd 25 watts to 1200 watts using 2 mosfets pg 218 ab722e449ca921e4.jpg (263.3 KB, 427 views)
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File Type: pdf top lay(1).pdf (196.0 KB, 381 views)
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Old 12th December 2012, 09:32 AM   #3022
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stewin what is your inductor value?
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Old 12th December 2012, 09:39 AM   #3023
manojtm is offline manojtm  India
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Hi Hadi,

mistake:

do not use Lm7812 for TTL ics (74HC04) it is LM7806 or LM7805 otherwise it will damage. re check IC damaged or not.
how much turns for T106-2?? picture shows @ 80 Turns is it? you can reduced to 59 turns.
connected power supply not mentioned(no picture)

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MANOJ
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Old 12th December 2012, 12:58 PM   #3024
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Hi sir manoj
yes 80 turn
i have resistors 820 ohm and 680 ohm with 1% telorance for changhe the FREQ
i use LM7806 like your shematic in board
i whant use LM7812 for bias section not in the board
amp is alive and TTL IC is work good
how can i change the curent option on your board?
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Old 12th December 2012, 01:32 PM   #3025
manojtm is offline manojtm  India
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Quote:
how can i change the curent option on your board?
Hi Hadi,

i will send the schematic

regards
Manoj
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Old 12th December 2012, 01:40 PM   #3026
manojtm is offline manojtm  India
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Hi Hadi,

Over current (I) = 550mv/0.04 Ohm x 1k5+1k/1k = 34A

remove resistor R2 and R4(1K) OC will be @13A

Regards
Manoj
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Old 12th December 2012, 02:41 PM   #3027
stewin is offline stewin  Kenya
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Quote:
Originally Posted by irvynejay View Post
stewin what is your inductor value?
20turns in the ee core from pc power supply with 3mm gap in the center
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Old 12th December 2012, 04:06 PM   #3028
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Default thanks to sir manoj

Quote:
Originally Posted by manojtm View Post
Hi Hadi,

Over current (I) = 550mv/0.04 Ohm x 1k5+1k/1k = 34A

remove resistor R2 and R4(1K) OC will be @13A

Regards
Manoj
thanks sir manoj
some thing wrong in this pdf file
the colector of 2n5551 must be connect to leg 2 off ne555 ic not leg 5 !!!!
correct ?
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Old 12th December 2012, 04:29 PM   #3029
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sir manoj
in your over current protection pdf file you write from filter.
which filter you mean ?
amp out put filter or your power board big capasitors and diod brighe filter?
and
can you please share a beter form of your formula for over current section like this over current(I) = V .../ R... * R1 + R4 / R2
or some thing like this ?
thanks
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Old 13th December 2012, 05:39 AM   #3030
manojtm is offline manojtm  India
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Quote:
some thing wrong in this pdf file
the colector of 2n5551 must be connect to leg 2 off ne555 ic not leg 5 !!!!
correct ?
Hi Hadi,
schematic shows over current section only.not "leg 5 of 555 ic " it is BIAS center pin "s".

Quote:
Over current (I) = 550mv/0.04 Ohm x 1k5+1k/1k = 34A
550mV= Transistor ON min voltage(V)
0.1R*3= 0.04 Ohm--- Current resistor(R)
R1=R3 --- 1K5
R2 & R4= 1K

I = V/R x R1+R2/R2

Quote:
which filter you mean ?
amp out put filter or your power board big capasitors and diod brighe filter?
Yes Power Board Bridge diode and Big Capacitor filter.

Regards
MANOJ
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