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OPA1688: load issue

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Genius 3760 points
Part Number: OPA1688
Other Parts Discussed in Thread: OPA1622,

Tool/software:

Hi ti team，

When the OPA1622 operates at a volume level of -4dB with no load:

  • The OPA1688 has an input voltage of 1.173 V and a THD+N (Total Harmonic Distortion + Noise) of 0.042777%.
  • The output of the OPA1688 is 1.519 V with a THD+N of 0.061113%.

However, after connecting a 24Ω load:

  • The voltage at the pre-stage of the power amplifier is 1.173 V with a THD+N of 0.039162%.
  • The output of the OPA1688 is 866.9mV with a THD+N of 28.15%.

As shown in the figure below: Please help analyze what causes this?