IC Controlers for Class D Power stage - Page 2

Bruno Putzeys · 12th May 2005, 09:09 AM

Quote:

Originally posted by frozenpod1
Does anyone know what the UCD400 uses for control is it an IC or descrete components

The comparator and the mosfet drivers are entirely discrete. In addition, the control and modulation circuit are completely passive (the amplifier is self-oscillating). There is an op amp buffer at the input.

Workhorse · 15th May 2005, 06:43 AM

Quote:

Originally posted by frozenpod1
In power electronic inverters 3 level modulation is almost always used.

The increase in performance at 50Hz is very large when going from 2 to 3 level.

That is why I was going to use 3 but I may have to reconsider

We also use 3 level modulation scheme in our subwoofer amp, in which switching frequency is in phase but audio signal is out of phase, in this configuration the size of output filter could be made small as compared to 2-level. And the damping factor also improves alot . it also minimises the distortion effects and eliminates bus pumping as well.

frozenpod1 · 15th May 2005, 11:18 PM

Are you not concerend with the audio signal being out of phase as in the canceling effect with other speakers which are in phase.

Also there is a difference in the way we hear sounds wether the first peak is positive or negative air pressure, there have been test which prove there is a difference that is why it is very important to insure that the amplifier is in phase or out of phase by 360 deg.

Workhorse · 16th May 2005, 11:16 AM

What i was refering to an is a bridged amp comprises of 2 half bridge Class-D amps in which the switching frequency is in phase , but the audio signal is out of phase.

Hope you understand it.

capslock · 17th May 2005, 03:25 PM

The AD1990 - 1996 look nice enought to me. Unfortunately, they are not even in the samping stage yet.

16th May 2005, 11:16 AM	#14
Workhorse diyAudio Member Join Date: Dec 2004	What i was refering to an is a bridged amp comprises of 2 half bridge Class-D amps in which the switching frequency is in phase , but the audio signal is out of phase. Hope you understand it. __________________ It's a fruitless endeavor to try and educate a fool that rejoices in ignorance

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15th May 2005, 11:18 PM	#13
frozenpod1 diyAudio Member Join Date: May 2005 Location: Melbourne	Are you not concerend with the audio signal being out of phase as in the canceling effect with other speakers which are in phase. Also there is a difference in the way we hear sounds wether the first peak is positive or negative air pressure, there have been test which prove there is a difference that is why it is very important to insure that the amplifier is in phase or out of phase by 360 deg.

17th May 2005, 03:25 PM	#15
capslock diyAudio Member Join Date: Feb 2002 Location: Germany	The AD1990 - 1996 look nice enought to me. Unfortunately, they are not even in the samping stage yet.