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Old 3rd May 2005, 07:37 AM   #1
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Default IC Controlers for Class D Power stage

I am building a Class D amplifier and I am looking for a controler IC.

I am after awesome THD+N lower than 0.1%

The control chip must me able to handel a 500W RMS plus power stage output.

I have seen the MUETA and they look very good but I have not heard a response from the company.

I would also like to find out what other chips are avaliable so that I can review all my options before committing.
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Old 3rd May 2005, 09:22 AM   #2
IVX is offline IVX  Russian Federation
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yeah, mueta is old history, and pretty strange that no any news from they so far.. You can see some tripath driver chips, however, (IMHO) not so much HI-FI yet.
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Old 3rd May 2005, 10:08 AM   #3
witali is offline witali  Russian Federation
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Exactly IC?
4 op amp lf347. 2 comparatops lm319, 2 tranzistors. driver IR2010, and two MOSFEET.....
I think uncomplicated
excuse me for bad english
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Old 4th May 2005, 07:36 AM   #4
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I am looking for a controler which will provide which me with dead time 500KHz 3 level PWM and has been used to produce at least 100W at less than 0.1% THD+N
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Old 4th May 2005, 08:19 AM   #5
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Quote:
Originally posted by frozenpod1
I am looking for a controler which will provide which me with dead time 500KHz 3 level PWM and has been used to produce at least 100W at less than 0.1% THD+N
Most people build their own controller. 0.1% distortion is quite high by nearly everyone's standard (bar the proponents of open loop digitally controlled amps, they will put up with anything as long as they can stick the digital label onto it).
A 3-level controller is simply two 2-level modulators sharing one clock and integrating control loop. Getting good distortion results from 3-level schemes is difficult. For one it won't work well using a differential LC filter because you loose the soft-switching advantage resulting in large amounts of distortion at low signal levels (unless you actually have the MOSFET timing overlap somewhat). You need two separate LC filters instead. Then, crosstalk between the two power stages and comparators is another source of problems, again around zero crossings.

In other words, may I suggest that you have a go at 2-level modulation first?
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Old 6th May 2005, 06:13 AM   #6
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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
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Old 12th May 2005, 08:03 AM   #7
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Does anyone know what the UCD400 uses for control is it an IC or descrete components
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Old 12th May 2005, 08:11 AM   #8
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The UcD400 is FULL DISCRETE

Only IC in the input gain stage and a cmos HEF4093B / LM393 in the protection and on/off timing....

Jan-Peter
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Old 12th May 2005, 08:13 AM   #9
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What control method is used?
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Old 12th May 2005, 08:17 AM   #10
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Control methode is UcD.......

Phase shifted self oscillating Class-D. On this forum are a lot of threads about how the UcD concept does work.

Regards,

Jan-Peter
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