• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 29 subscribers
  • Views 340 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM48580: Using with magnetic speaker

Eckart Hanl
Prodigy 70 points
Part Number: LM48580


Hi,

we have found an error in our schematic using the LM48580. In the datasheet, we didn't see that the device can only be used with ceramic speaker.

We took a magnetic one:

https://www.knowles.com/docs/default-source/model-downloads/rab-32257-000.pdf?Status=Master&sfvrsn=9a2d75b1_0

We see that the sound output with PWM works fine, and the tones are played how we want.

What can be the problems when we take the wrong speaker with this device?

Can there be problems with the stability of the device, or can we also use our speaker with your device?

Our problem is that changing the schematic and PCB is very difficult, because this PCB is now in production.

Regards

Eckart

  • +1
    TI__Guru** 111065 points

    Hi Eckart,

    LM48580 should be OK driving a conventional speaker. It is usually recommended to place a series resistor to prevent short-like behavior or ceramic speakers at higher frequencies, in your case this series resistor would not be required.

    Best regards,
    -Ivan Salazar
    Applications Engineer