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Class D Switching Power Amplifiers and Power D/A conversion

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Old 24th July 2006, 08:20 PM   #1
epilot is offline epilot  United States
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Default Class D driver

Hi,

I need a class D amplifier that works at 60kHz as a piezo driver
I was not able to find a popular chip in my location so it should be made of transistors.

Thanks
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Old 24th July 2006, 11:38 PM   #2
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Why do u want to use a Class D amp to drive a piezo?

-SL
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Old 25th July 2006, 02:22 AM   #3
epilot is offline epilot  United States
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Quote:
Originally posted by SpittinLLama
Why do u want to use a Class D amp to drive a piezo?

-SL

Just for a project
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Old 25th July 2006, 05:09 PM   #4
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Well a piezo speaker looks more like a capacitor than a inductor and resistor like a dynammic speaker using a voice coil. Not sure how Class D would hanlde this load plus a piezo is more efficient than a dynamic so fi you want Class D for efficiency you may not need it really. Maybe someone who has tried to do what you are can give some input.

-SL
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Old 26th July 2006, 05:38 PM   #5
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Curious to know what kind of project it is.

Is building the amp yourself a requirement of the project or are you just trying to save some money. Otherwise, any old amp will do if all your doing is driving a piezo. But you need to add a resistor at least, or you could burn up an amp, Class D or otherwise.
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Old 27th July 2006, 05:39 AM   #6
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Do you just want to reproduce 60 kHz constantly and nothing else ?
In this case there are simpler solutions than a class d amp.
How about a switching stage (50% duty cycle) followed by a tank circuit ? The latter could even be used to transform the audio to a higher voltage if needed.

Regards

Charles
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Old 27th July 2006, 06:55 AM   #7
kartino is offline kartino  Indonesia
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Some kind of mosquito or rat repellent? Why don't use simple signal generator?

Or it is just project?
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Old 31st August 2006, 07:49 PM   #8
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Default Piezo driver

Hi !

You could look into Apex Micortechnology, they had good class D
piezo driver.

http://eportal.apexmicrotech.com/mainsite/
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