Dead Time and Crossover Distortion - Page 4

Eva · 19th February 2009, 03:02 PM

I don't think that adaptive dead time is really required. If the circuit provides good switching precision, the delay from gate drive to the switching node becomes linearly dependent on output current (due to switching di/dt) and this does not produce substantial distortion, it only increases open loop output impedance slightly.

ChocoHolic · 19th February 2009, 06:14 PM

...also my impression is that you do not need an adaptive system, but high timing precision.
Basically this one is adaptive, but unfortunately designed for deadtimes which are to long for high quality class D. .... may be for subwoofer amps with low switching frequency...
http://www.national.com/pf/LM/LM5104.html

19th February 2009, 03:02 PM	#31
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	I don't think that adaptive dead time is really required. If the circuit provides good switching precision, the delay from gate drive to the switching node becomes linearly dependent on output current (due to switching di/dt) and this does not produce substantial distortion, it only increases open loop output impedance slightly. __________________ I use to feel like the small child in The Emperor's New Clothes tale

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19th February 2009, 06:14 PM	#32
ChocoHolic diyAudio Member Join Date: Dec 2003 Location: Munich	...also my impression is that you do not need an adaptive system, but high timing precision. Basically this one is adaptive, but unfortunately designed for deadtimes which are to long for high quality class D. .... may be for subwoofer amps with low switching frequency... http://www.national.com/pf/LM/LM5104.html

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