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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Hi Dan.. posted by jneutron on August 28, 2003 at 05:19:47:
During four quadrant operation, quadrants 1 and 3 are amp feeding load the power, 2 and 4 are load returning.In 2 and 4, the output can be full swing, say 50 volts negative, while the load is trying to be full positive. The instantaneous power dissipated in the die will be much larger than a resistive loadline would force.
In that condition, can the die junction temperature be forced higher sufficiently fast that, the bias tracking circuitry can't follow it, giving a temporary deadband to the output circuit, and forcing class B operation as if no quiescent current is being used?
As I recall, the sensefets from IR were designed to get around both the IR drop of sense resistors, as well as allow very quick mod of the output bias circuits.
If you recall, this is the exact same question I asked months ago, bout high frequency damping factor during 4 quadrant operation.
Cheers, John
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Follow Ups
- I forgot to mention.. - jneutron 05:59:03 08/28/03 (3)
- Re: I forgot to mention.. - Dan Banquer 09:47:03 08/28/03 (2)
- Re: I forgot to mention.. - jneutron 10:24:16 08/28/03 (1)
- Re: I forgot to mention.. - Dan Banquer 11:50:31 08/28/03 (0)
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