So it looks like the L30 II uses 2x TI-TPA6120A2 current amps to drive the stereo 1/4" output.
Each chip is stereo, and its datasheet says 700mA for maximum current per channel.
Topping gives 1.4A as the maximum current capability of the L30 II
- I take it this means the amplifier is configured in a bridge mode, or possibly parallel somehow (it is a current output design...), with each stereo chip utilizing both of its channels to drive one 'side'
Would Topping be using half of each chip to maximize thermal headroom, and giving a peak rating as 2x the maximum rating? I don't think this is likely because peak should only be +~40% of "maximum" (based on a sine wave), and Topping is always so good with their specifications matching others' (Amir's!) measurements (and others too lol), so I'm leaning toward:
they're somehow bridging or paralleling the amp outputs.
But, then, how do you have a common ground with two, seperate, bridged amplifier chips??
Or even paralleled? The 6120A2 says 39.2 ohms is the default arrangement to have on the pins of each of its outputs, and in a descriptive paragraph below, says this value can be reduced, but not to less than 10 ohms, lest load capacitance can potentially cause oscillations. Of course this can be mitigated in other ways... On other devices that Topping uses these chips in, I've seen output resistors lower than 10 ohms - I think 3.3 or 2.2? Quite a bit lower than 10, and just 5-6% of 39.2!
How can you see paralleling two outputs with each having just 2 or 3 ohm resistors on them before sending them to the audio jack. And also, how can this design have a common ground? How is this working?! I'm so confused....
Each chip is stereo, and its datasheet says 700mA for maximum current per channel.
Topping gives 1.4A as the maximum current capability of the L30 II
- I take it this means the amplifier is configured in a bridge mode, or possibly parallel somehow (it is a current output design...), with each stereo chip utilizing both of its channels to drive one 'side'
Would Topping be using half of each chip to maximize thermal headroom, and giving a peak rating as 2x the maximum rating? I don't think this is likely because peak should only be +~40% of "maximum" (based on a sine wave), and Topping is always so good with their specifications matching others' (Amir's!) measurements (and others too lol), so I'm leaning toward:
they're somehow bridging or paralleling the amp outputs.
But, then, how do you have a common ground with two, seperate, bridged amplifier chips??
Or even paralleled? The 6120A2 says 39.2 ohms is the default arrangement to have on the pins of each of its outputs, and in a descriptive paragraph below, says this value can be reduced, but not to less than 10 ohms, lest load capacitance can potentially cause oscillations. Of course this can be mitigated in other ways... On other devices that Topping uses these chips in, I've seen output resistors lower than 10 ohms - I think 3.3 or 2.2? Quite a bit lower than 10, and just 5-6% of 39.2!
How can you see paralleling two outputs with each having just 2 or 3 ohm resistors on them before sending them to the audio jack. And also, how can this design have a common ground? How is this working?! I'm so confused....
