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Old 17th May 2011, 01:20 PM   #1
markusA is offline markusA  Sweden
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Default Class-D Discrete vs Chips?

In the traditional amplifier world OP-amps and chips in general are often considered sort of "low end".
Now we're in the Class D forum and the rules have suddenly changed.

Which is better? To use transistors or chips?
When you buy OP-amps and readymade cirquits they are already optimised for performance, is there any reason to use the old school components beside maybe saving a $? I said maybe because the new cirquits aren't so expensive anymore.
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Old 17th May 2011, 09:07 PM   #2
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For a first design I would go with a chip solution.
Chips like the irs2092 have deadtime and over current protect built in.

Once you have mastered a chip solution you will be ready for a discrete design.
Murton-Pike Systems PCBCAD51 pcb design software.
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Old 17th May 2011, 09:09 PM   #3
markusA is offline markusA  Sweden
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I take it discrete cirquits are still king then?
(As long as it's designed the right way)
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Old 18th May 2011, 07:13 AM   #4
Hitec is offline Hitec  Finland
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Somehow I think IC is always better if specifications for design are good and design is well made. Anyway, I don't have any experience on comparing these two objectively. Some good reasons could be:
  • Tighter layout on substrate. This translates to better EMI properties, smaller parasitic components and shorter transmission lines (digital circuits).
  • Well tested as no one makes on IC before making sure it works
  • Smaller footprint on PCB
  • Ease of use --> may be a downside for a hobbyist
However, it is interesting to make a circuit to work with discrete components.
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Old 18th May 2011, 08:33 AM   #5
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For very first design IC is the best choice.........once got experienced then you can move to discrete components as your requirements change.
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Old 19th May 2011, 10:20 AM   #6
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Default chip vs discrete


(i'm french)

i'm persuaded than chip is better, shorter lenght...

the discrete make a lot of loss....

oNLY BLIND TEST CAN easily answer to this questtion

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Old 19th May 2011, 11:36 AM   #7
marce is offline marce  United Kingdom
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High DI/Dt switching etc the technology is better with integrated designs, using discretes and especialy through hole, you are adding parasitic inductance, not good for class D.
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