Other Parts Discussed in Thread: TPA3144D2
(Amendment: Please ignore my questions below as after testing, and confirmed from another thread, over-voltage-locked-out will turn-off the IC above 15+ Volt. So, how can I delete this post?)
I select TPA3140D2 for a project because of its unique AGL functions (only 3140 and lower power 3144 have such features amongst TI's HTSSOP-28 amplifiers).
In my application, the amp will be powered by four Li-ion cells, thus maximum voltage will be 16.8V (4.2V x4). I prefer no supply regulations, neither linear or buck.
We can solder the HtSSOP-28 onto a very thermal effective substrate; say, an AlN (aluminum-nitride) board, with a very large heatsink on the bottom. Thus, maximum IC thermal-pad temperature of no more than 10 degC over ambient can be guaranteed. Plus, no over-current protection triggering by a low speaker loads can also be guaranteed.
Therefore, under such arrangements, the TPA3140D2 will be operated in "very cool" conditions always.
If so, can TPA3140D2 safely operate under 16.8V, instead of the listed 14.4V?
Or, what is the observed failure mechanism(s) in the region of such 14.4V to 20V (absolute maximum rating)? Thermal stress, dielectric breakdown, latch-up, power dump, or...? Any special caution(s) to avoid such failure? Efficient heat-sinking (like what I did), higher load resistance, clamps and diodes, snubbers, etc?
p.s. I noticed that, in "Revision History" (page 2) of datasheet Revision B (Dec 2017), the absolute maximum rating is amended from 16V to 20V. What events or observations that caused such changes?
