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DRV8662: Abnormal waveform of DRV8662...

Part Number: DRV8662

Dear Sirs,

Is there anyone knows what's the problem with the DRV8662?

Attached are the schematics and waveform with/without loading!

Gain1=Gain2=0

Please help.

Thanks.

1. schematics:

2. output waveform without loading.

3. output waveform with loading.

 

  • Hi Peter,

    First I would highlight that Ilim is set to 1.5A and the boost inductor seems to be rated for 1.3A saturation current. The boost inductor should be rated for the maximum current set for the boost.
    Have you tried with different boost inductors?
    What is your load capacitance? Have you tried with different loads?
    Also this device is usually used for considerably lower frequency signals, below 500~300Hz as shown in the data sheet. Have you tried with lower frequency signals?

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • Peter,

    Is there any update on this from your side? It has been several days since last communication.
    We would like to follow up and close the thread accordingly.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators