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Class D Switching Power Amplifiers and Power D/A conversion

Class D with above 2.5Mhz output?
Class D with above 2.5Mhz output?
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Old 4th December 2019, 03:12 PM   #1
chchyong89 is offline chchyong89  Malaysia
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Default Class D with above 2.5Mhz output?

Is there any class D amplifier that is fast enough to have 50V/us or above? So i am expecting the output pwm is beyond 2.5Mhz.

So i am looking for an chip Class D that able to work over 200khz, and if possible DC output too!

I have bought some irs2092, TPA3255, but their output is just around 400~500khz.

Attached is the output that i wish to generate, and the load will be very low.

I have tried to drive with 4xparallel LME49600, surprisingly they cant do the job.
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File Type: jpg IMG_20191114_154129.jpg (604.1 KB, 101 views)
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Old 4th December 2019, 05:29 PM   #2
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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My simple design runs at 280KHz without any truoble.
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File Type: jpg 9.JPG (137.0 KB, 87 views)
File Type: jpg 11.JPG (148.7 KB, 86 views)
File Type: jpg Class D Audio.jpg (431.3 KB, 89 views)
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Old 4th December 2019, 06:41 PM   #3
Mark Tillotson is offline Mark Tillotson
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Quote:
Originally Posted by chchyong89 View Post
Is there any class D amplifier that is fast enough to have 50V/us or above? So i am expecting the output pwm is beyond 2.5Mhz.
That's GaNFET territory I think.
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Old 4th December 2019, 07:33 PM   #4
MorbidFractal is online now MorbidFractal
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Looks very much like you are trying to recreate the drain waveform on a single/two switch forward/flyback convertor?
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Old 5th December 2019, 01:02 AM   #5
chchyong89 is offline chchyong89  Malaysia
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Quote:
Originally Posted by Mark Tillotson View Post
That's GaNFET territory I think.
I am considering Ganfet too...
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Old 5th December 2019, 01:03 AM   #6
chchyong89 is offline chchyong89  Malaysia
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Quote:
Originally Posted by MorbidFractal View Post
Looks very much like you are trying to recreate the drain waveform on a single/two switch forward/flyback convertor?
It is for piezo actuator use.
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