DRV632: Gain Vs. Output Load

Hi Brian,

Gain setting depends on the feedback and input resistors. There is some background information and formulas in the data sheet.
Output power is affected by the output load.
Do you need any specific data for a combination of gain setting, output voltage/power and output load?

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

Could you please help provide the specific data for a combination of gain setting, output voltage/power and output load?

Especially the curve relationship with the "Gain vs -load" 

There are several questions here for devices.

1. What's the difference in application for both DRV632 and TPA6138A2? it looks DRV632 supports 600Ω and TPA6138A2 supports 16Ω.

2. Please refer to Fig 2 plot of the TPA6138A2, when PO>30mW, the THD dramatically rising up. 30mW is about 0.7Vrms. does it mean that the output voltage needs to less than 0.7Vrms when 16Ω head phone is used?

3. Can DRV632 support Po up to 40mW? There is no spec for it???

Regards,

Brian

    

Hi Brian,

1. DRV632 is focused on line driver applications, while TPA6138A2 is used for headphone applications.
2. That's correct, using lower load will affect the THD+N performance as the current increases.
3. I can try this in the bench, what would be the load impedance? TPA6138A2 is focused on headphone applications so it is able to reach higher current. So if looking for power and not voltage (as line driver applications) you could change from DRV32 to TPA6138A2.

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