TI E2E Community
DRV8662 and actuators
First of all hi everybody and thanks for this forum !!!
First question: I've just purchased some AAC MLB3503-G piezo actuators as you suggested in your datasheet. At this point I have a problem: you say they have a 200 Vpp voltage rating. AAC says they have 120 Vpp maximum voltage rating (see page 13 on their manual at http://www.aacwireless.se/PDF/Piezo%20Catalogue.pdf). Please: who's right ??? :-)
Second question: May I connect more than one piezo actuator (in parallel) to just one DRV 8662 driver ? Same kind of piezo actuators I mean. And if yes how many actuators can I connect ?
Thank you !!!
Thanks for your interest in Piezo haptics! Let me see if I can answer your questions.
MLB3503A-G: 200 Vpp
MLB3503B-G: 80 Vpp
MLB3503C-G: 48 Vpp
They did have a version at one point that was 120Vpp, but I'm not sure of it's current status. Is there a letter identifier in the Piezo part number you received?
Regarding multiple actuators, the DRV8662 supports a particular load (ie - 100nF @ 200Vpp or 680nF @ 50Vpp), so if the sum of the capacitance is not much greater than the recommended load at that voltage then it should be okay to use multiple actuators. You can find the recommended load in the DRV8662 datasheet.
Let me know if I answered your questions.
Brian P. Burk
Analog Applications Manager
Dallas, TX USA
The AAC actuators seems to be hard to get hold of. Does any of you know any resellers that stock them, or equivalent actuators?
Ole Adrian Heggli
The AAC actuators are not stocked by distributors at this time. The best option is to contact AAC directly through their website to request information and samples.
Thank you for the quick reply!
Currently waiting to hear back from AAC. If anyone have suggestions for alternative actuators, please share. Will probably go ahead and try some from PUI Audio in the meantime.
I, too, am looking to move from Piezo discs on a project to shake a part of the system as they are more challenging to work with in manufacturing. I am very much hoping to use the Piezo Haptic modules that are surface mount but designed to shake the PCB assembly. Also having trouble finding a rapid way of getting sample parts. Any alternatives to waiting for a reply from AAC would be greatly appreciated.
Yeah, I am still waiting for a reply from AAC, will give them a call towards the end of the week. I am considering actuators from Steminc, but are still awaiting a data sheet. Here is a link: http://www.steminc.com/piezo/SMBTA352D2T07M.asp
Mide Technology (disclaimer: I work here!) also has a line of hermetically sealed piezo bimorph products (http://www.mide.com/products/qp/qp_catalog.php#actuator ) that work well over the DRV8662's output voltage range. They are probably more expensive than some others in small quantities - mainly aimed at high-stroke and harsh environment / medical applications - but are available through direct click-n-buy ordering in any quantity (Digikey soon!), no begging sales reps to return your calls :-)
Thank you for the link. I will check those out!
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