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TPA2025D1: Driving 28 Ohm speaker (receiver) load at low power

Andy Wong
Prodigy 20 points
Part Number: TPA2025D1

We have a TPA2025D1 in a design driving a 8 Ohm speaker at around 1.5W. I need to modify the design so that the PA output has an electronic switch to switch between two speakers

1. the original 8 Ohm speaker at 1.5W

2. a smaller speaker (called receiver in phone terminology) 28 to 32 Ohm at 20mW (we will reduce the output from the codec to achieve the 20mW speaker output)

I don't have problem using the PA to drive 8 Ohm speaker but I am not sure whether there is problem driving the 28 to 32 Ohm speaker at low power. What parameters will degrade? Efficiency? THD? Will the PA become unstable? The data sheet does not say anything about load higher than 8 Ohm. Thanks.

  • 0
    TI__Guru* 97925 points

    Hi Andy,

    Driving higher impedance speaker should not cause any issue or performance degradation, only the maximum power would be lower as higher current would be required compared to a lower impedance load, however since you're actually planning to drive lower power, this should be OK.

    Best regards,
    -Ivan Salazar
    Applicaitons Engineer