7.3.2 Output Current Limit

The output current of the OPA164x-Q1 series is limited by internal circuitry to 36 mA and –30 mA (sourcing and sinking), to protect the device if the output is accidentally shorted. This short-circuit current depends on temperature; see Figure 26.

Although uncommon for most modern audio applications to require 600-Ω load drive capability, many audio operational amplifier applications continue to specify the total harmonic distortion (THD+N) at 600-Ω load for comparative purposes. Figure 7 and Figure 8 provide typical THD+N measurement curves for the OPA164x-Q1 series, where the output drives a 3-V_RMS signal into a 600-Ω load. However, correct device operation cannot be ensured when driving 600-Ω loads at full supply. Depending on supply voltage and temperature, this operating condition can possibly trigger the output current limit circuitry of the device.