Help with current booster vs paralleling

leadbelly · 10th July 2008, 05:11 PM

Can anybody help me understand the pro's & con's of the following 2 topologies for additional current output? The attached figure shows a second power opamp configured as a current booster on the top, and a second opamp configured in parallel in the bottom. The opamp is unity gain stable. TIA

KSTR · 10th July 2008, 08:05 PM

The bottom setup is more "uniform" by design than the top (true parallelism), which could be an advantage, besides the fact that the opamps need neither be unity gain stable nor have a big input common mode range. The top circuit is more flexible, since the master amp can be hooked up in variety of ways without the need to exactly double controls and/or component values, including the option of closing the feedback loop after the load-sharing resistors.

See Apex-AN26 Parallel Connection

For perfomance audio I'd be more inclined to use the true parallel approach, it's also quite nice to bias the amps into a bigger class A region (but that can by done with the other setup, too)

- Klaus

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10th July 2008, 08:05 PM	#2
KSTR diyAudio Member Join Date: Jul 2007 Location: Central Berlin, Germany	The bottom setup is more "uniform" by design than the top (true parallelism), which could be an advantage, besides the fact that the opamps need neither be unity gain stable nor have a big input common mode range. The top circuit is more flexible, since the master amp can be hooked up in variety of ways without the need to exactly double controls and/or component values, including the option of closing the feedback loop after the load-sharing resistors. See Apex-AN26 Parallel Connection For perfomance audio I'd be more inclined to use the true parallel approach, it's also quite nice to bias the amps into a bigger class A region (but that can by done with the other setup, too) - Klaus

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