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Class D Switching Power Amplifiers and Power D/A conversion

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Old 10th August 2012, 04:27 PM   #2211
CPX is offline CPX  Romania
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Quote:
Originally Posted by stewin View Post
does dead time vary with voltage ? as in the more high voltage you use the more you have to adjust dead time.? and how cn one adjust ??
Digital deadtime no,but effective analog deadtime may vary somewhat with this schematic ,you have to measure with the scope.
But with increased voltage , switching disipasion increases also , and you should adjust deadtime at maximum used voltage for lowest THD possible and maneable disipation.

Last edited by CPX; 10th August 2012 at 04:31 PM.
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Old 11th August 2012, 06:26 AM   #2212
manojtm is offline manojtm  India
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Hi

provide fast switching diode MUR1560 like this

Regards
MANOJ
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Old 11th August 2012, 03:06 PM   #2213
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Originally Posted by thienchay View Post
Hi
+ (12V) on Regulator Board connect to +12V on Power board
.... and - (GND) on Regulator Board connect to COM (V-) on Power Board .
GND of Regulator must be connect to V- on Power Board .

thanks,,,Thienchay
its negative referred....i have etch the pcb of the design which u provided...can u tell me the value of the resistor RSS and osc and also RFB....i need to know the inductance of output coil
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Old 12th August 2012, 02:09 AM   #2214
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Quote:
Originally Posted by sweetperfume View Post
thanks,,,Thienchay
its negative referred....i have etch the pcb of the design which u provided...can u tell me the value of the resistor RSS and osc and also RFB....i need to know the inductance of output coil

Yeah .
- RSS dependent of rail voltage you used , you can calculate it , RSS = (Volt - V(zener) / 0,01 (set 10mA passing RSS) .
+ EX : If you used +/- 75V ; RSS = (75 - 5,6) / 0,01 = 6940 , so you should used 6,8K ohm / 2W
- RFB = 100K , OSC = 1K , it set Gain .
- OCP = (V bias x R ocp / 6800 ) / R (Source MOSFET) . Set limit of output current .
+ EX : I used 12V Bias , R ocp = 220 ohm , R (Source) = 0,02 ohm ( 5 x 0,1 ohm parallel)
(12 x 220 / 6800) / 0,02 = 19,4 Ampe
Change R ocp is change limit output current .

- L output ~ 30 - 40 uH .

Last edited by thienchay; 12th August 2012 at 02:19 AM.
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Old 12th August 2012, 05:12 AM   #2215
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Hi Thienchay,what output mosfet can i use for +/-80V ? i was thinking at IRFB5620 (25nC gate charge) because they are class d mosfets and they are easy to drive at high speed without overheating the driver IR2110.I build a CHE900 and with IRFP4227 and 1k at oscilator i had 500Khz oscilation but the IR2110 was very hot 60-65 degrees,so i change the R OSC at 470R and got exactly 300Khz IR2110 only 40 degrees but the sound on high's was a little under the veil like something was missing.

Last edited by ionutzxpo; 12th August 2012 at 05:18 AM.
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Old 12th August 2012, 08:45 AM   #2216
STAGE4 is offline STAGE4  Sri Lanka
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Default DIGITAL ANACONDA-up to 3000w

DIGITAL POWER AMP( up to 3000w ) ZDX - YouTube
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Old 12th August 2012, 10:23 AM   #2217
paskal9 is offline paskal9  Malaysia
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Quote:
Originally Posted by ionutzxpo View Post
Hi Thienchay,what output mosfet can i use for +/-80V ? i was thinking at IRFB5620 (25nC gate charge) because they are class d mosfets and they are easy to drive at high speed without overheating the driver IR2110.I build a CHE900 and with IRFP4227 and 1k at oscilator i had 500Khz oscilation but the IR2110 was very hot 60-65 degrees,so i change the R OSC at 470R and got exactly 300Khz IR2110 only 40 degrees but the sound on high's was a little under the veil like something was missing.
ionutzxpo, is this the ROSC that you're talking about?
Click the image to open in full size.
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Old 12th August 2012, 10:42 AM   #2218
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no! its the one betwen the 1N capacitors
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Old 12th August 2012, 11:15 AM   #2219
paskal9 is offline paskal9  Malaysia
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Originally Posted by ionutzxpo View Post
no! its the one betwen the 1N capacitors
ok. thanks for the information. never knew how to change the oscillation frequency in that design before.
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Old 12th August 2012, 12:12 PM   #2220
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thanks thienchay,
will be back with the response.......could u plz tell me why dint u use totem drivers????????/
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