LM48560: recommended piezo driver for piezo speaker

K.Yaita

Part Number: LM48560
Other Parts Discussed in Thread: LM48580, DRV2700

Hi Team,

1)
Could you tell me recommended piezo driver for the following piezo speaker?
> PHUA3030-049B-00-000
I found LM48560 and LM48580. Are these recommended device?

2)
My customer also looking for piezo haptics driver for the following piezo actuators.
> PHUA8060-35A-33-000
> PHUA3015-30A-21-000
Could you tell me recommended devices?

Best Regards,
Yaita

over 4 years ago

0 Luis Fernando Rodriguez S. over 4 years ago

TI__Guru* 84915 points

Hi, Yaita-san,

Do you have the capacitance value for each device? Usually, our piezo drivers are selected depending of the piezo capacitance. If you could get this value, it would be helpful to recommend a piezo driver for you. Otherwise, I could only say that the DRV2700 is the piezo driver with more capabilities an wider accepted capacitance range.

Best regards,
Luis Fernando Rodríguez S.

0 K.Yaita over 4 years ago in reply to Luis Fernando Rodriguez S.

Guru 29710 points

Hi Luis-san,

1)
> PHUA3030-049B-00-000
capacitance value: 4.8uF±15%
https://media.digikey.com/pdf/Data%20Sheets/TDK%20PDFs/PiezoListen_DS.pdf
The datasheet shows operating voltage range is 0±12V, is it possible for DRV2700 to drive the piezo speaker?
DRV2700 datasheet shows recommended VBST is 15V(min).

2)
> PHUA8060-35A-33-000
> PHUA3015-30A-21-000
Regarding two device above, I couldn't find the capacitance value in datahsheet.
https://product.tdk.com/info/en/catalog/datasheets/piezohapt_commercial_phu_en.pdf
Should we ask the capacitance to TDK?

Best Regards,
Yaita

0 Luis Fernando Rodriguez S. over 4 years ago in reply to K.Yaita

TI__Guru* 84915 points

Hi, Yaita-san,

1) Unfortunately, the capacitance value of this load is too high for our piezo drivers. I would say that probably the LM48580 would be the best option, but I don't think it will have good performance due to the high capacitance level.

2) For these piezo actuators, could you get the capacitance value, please? Otherwise, we cannot suggest a piezo driver.

Thank you.

Best regards,
Luis Fernando Rodríguez S.

0 K.Yaita over 4 years ago in reply to Luis Fernando Rodriguez S.

Guru 29710 points

Hi Luis-san,

Regarding question 1), "11.1 Typical Performance Characteristics" in LM48580 datasheet shows under "RL = 6 μF + 10 Ω" condition.
Why the capacitance value 4.8uF±15% is too high for LM48580?

Best Regards,
Yaita

0 Luis Fernando Rodriguez S. over 4 years ago in reply to K.Yaita

TI__Guru* 84915 points

Hi, Yaita-san,

I apologize for the confusion, I made a confusion with the LM48560 capacitance value, which cannot handle high capacitance level. The LM48580 will be a good option to handle this capacitance level.

Please let me know if you have additional questions or comments.

Best regards,
Luis Fernando Rodríguez S.

0 K.Yaita over 4 years ago in reply to Luis Fernando Rodriguez S.

Guru 29710 points

Hi Luis-san,

Thank you for your reply.
Well noted.

Best Regards,
Yaita

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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LM48560: recommended piezo driver for piezo speaker