I'm designing a circuit with the TPA6132 and I'm following the data sheet example for single-ended input signals (L+ and R+ inputs grounded). My signal is mono, so I'm sending it to both inputs (L- and R-).
In my use case, the output socket is stereo (TRS) and there could either be a headphone (TRS) jack plugged in, or a line jack that could either be TRS or TS.
When plugging in a TS jack, the ring contact of the socket is shorted to ground via the jack sleeve contact, as expected when inserting a mono jack into a stereo socket. I assumed that in this case the short circuit protection would kick in and the right channel on the ring contact would be disabled. However, I'm measuring currents of up to 100 mA with a TS cable plugged in, which would render the solution unfit for my product, as it will predominantly be used in this configuration.
The data sheet does not explain the conditions in which the short circuit protection will engage, nor what exactly it does (limiting the current or disabling the channel). Can anyone please clarify? Is this chip designed to work with such a use case at all, or do I need something else?
