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Class D Switching Power Amplifiers and Power D/A conversion

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Old 10th January 2017, 06:37 PM   #21
stewin is offline stewin  Kenya
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Quote:
Originally Posted by kees52 View Post
Why not using a two output comparator? things can be simpler.
please post an example of schematic
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Old 10th January 2017, 06:49 PM   #22
stewin is offline stewin  Kenya
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Quote:
Originally Posted by jlester87 View Post
Current sense resistors should be of lower value, it will become hot on full power sinewave tests (and 1/4 of power dissipation of resistors on highly compressed music)

OCP on lowside can be replaced with IR25750L + comparator so that OCP will have no dissipation, can be adjusted without compromise, also cheaper than milliohm current sense resistors.

For highside, a digital isolator can be used, though complexity and cost will increase.

http://www.infineon.com/dgdl/ir25750...5355ca1d0e16f7
thanks lester for sharing . cool ocp chip
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Old 10th January 2017, 07:09 PM   #23
stewin is offline stewin  Kenya
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Quote:
Originally Posted by kees52 View Post
Why not using a two output comparator? things can be simpler.
like this

Last edited by stewin; 10th January 2017 at 07:16 PM.
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Old 10th January 2017, 07:30 PM   #24
kees52 is offline kees52  Netherlands
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I use opa2365 and power comparator schematic for testing, but this is a example.

Hmm maybe a class D circlotron, by removing half the power stage each half.
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Last edited by kees52; 10th January 2017 at 07:36 PM.
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Old 10th January 2017, 07:34 PM   #25
kees52 is offline kees52  Netherlands
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and this I did simulate, have quite low distortion because of multipole faseshift for self oscillation, the carrier stays quite stable now with overdrive.

Harmonic distortion is with 40 volts peak in 8 ohm, carrier 800 Khz, amp has 50 Khz bandwidth and there still -80 dB hd.

Just give it a try, I have not build it, just sim, I am now busy with a circlotron.

regards
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Old 10th January 2017, 07:38 PM   #26
kees52 is offline kees52  Netherlands
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Here some with high output power, 100 volts peak peak is near rails, ohh it do touch rails.
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Old 10th January 2017, 07:39 PM   #27
stewin is offline stewin  Kenya
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Quote:
Originally Posted by stewin View Post
like this
i wanted to use ir2110chip so that i can use irfb4227 n channel only fets +/-75volts full bridge. will the above dual lm311 work with ir2110 in ucd??
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Old 10th January 2017, 07:48 PM   #28
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by stewin View Post
i wanted to use ir2110chip so that i can use irfb4227 n channel only fets +/-75volts full bridge. will the above dual lm311 work with ir2110 in ucd??
This one maybe, ir2110 chip need opposite fase input? now you need not two lm 311, I am not check that. A very fast comparator is a must for low distortion, also a fast integrator opamp with minimum 50 Khz bandwidth so feedback do have low propagation delay.
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Last edited by kees52; 10th January 2017 at 07:50 PM.
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Old 10th January 2017, 07:57 PM   #29
stewin is offline stewin  Kenya
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so this will not work well in ucd
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Old 11th January 2017, 05:26 AM   #30
kartino is offline kartino  Indonesia
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Quote:
Originally Posted by stewin View Post
hi katrino, why don,t you use ucd like the below diagram. ucd is more stable than sigma except containing the noise is the hardest part , to make a good layout
I have both
UcD fullbridge is working fine. Yes you are right. But some people like chip because it has less numbers of part.
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