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Old 13th February 2007, 08:44 AM   #1
Dxvideo is offline Dxvideo  Turkey
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Question 150v 80Khz piezo driver amplifier

Hi all,

I need a 150Vpp output @ 75-80Khz frequency for a project. I need only 15-20W power at the load. Do you think an IC amp can handle that requirements with a transformer on output?

Thanks in advance..
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Old 13th February 2007, 09:41 AM   #2
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You firstly need to check datasheets, to see if the chip amps will go that high without roll off.
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Old 13th February 2007, 09:49 AM   #3
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I already checked LM1875, 1876 and 3886 datasheets; with LM1876 and 3886 there is no problem that they have a bit under 100Khz but LM1876 they only say 70Khz power bandwidth..
But at this point i have a transformer calculation problem.
- First, i dont know detailed trafo calculations,
- Second, the trafo has to be 80Khz tuned
- Third, primary coil must have 8 ohm exact inductive load at 80Khz.
- Fourth, this trafo must handle at least 20W power.
And naturally i cannot calculate a working trafo that can realise that needs!
I know that, here is not place for trafo calculations but may anybody calculate that trafo for me?
Thanks a lot.
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Old 13th February 2007, 09:52 AM   #4
Mushal is offline Mushal  South Korea
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In the following website, you can see a large amount of the power op amp product and the technical documents about the pzt driver using their products.

http://www.apexmicrotech.com

In my experience, their product works well on the pzt actuators.
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Old 13th February 2007, 09:55 AM   #5
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Yea, i know that products and for final project i will use a PA84 or PB51. But first i cannot buy one of them because they dont sell at small quantities. And i need a quick solution, however i cannot have that chips less than one month even i can purchase samples..
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Old 13th February 2007, 03:56 PM   #6
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150v p-p is like +-75 volts right? couldn't you just bridge 2 chips which doubles the voltage swing. the maximum PS of lm3886 is 84 volts . bridged that would give equivalent to +-80v or so
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Old 13th February 2007, 04:05 PM   #7
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is this for a sonar transducer?

I did a similar project before but since it needed only square waves, I used IRF540 fets and IR2112 driver to put 80Vp-p @ 200kHz into the transducer.
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Old 14th February 2007, 06:38 AM   #8
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No. Its for piezo ceramic motor driver. And i will use a signal generator to change frequency. So the amp must have 70-80Khz bandwidth at least.

Quote:
2 chips which doubles the voltage swing.
So if i use two LM3886 bridge and feed with +/-38v i can have 38x4=152v swing teorically. Is it? But i guess there is another problem that;
My piezo pads have 65pF capacitance. At this frequency (75Khz) it looks like short circuit from the amp output.. Do you think LM3886s can handle this?
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Old 14th February 2007, 06:47 AM   #9
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"........At this frequency (75Khz) it looks like short circuit ...."

How ? The reactance for 65pF at 75Khz is over 30 K ohms ! What am I missing ?

Your voltage swing with bridged mode is twice ( x 2 ) and not x 4.
It's power delivered which is x 4 ( voltage squared ).
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Old 14th February 2007, 06:49 AM   #10
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May be i am mistaken I havent made any calculation! Just a friend said that! Sorry.
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