Hi everyone,
I'm trying to understand the optimal implementation circuit for the TI TPA3116D2 chip in PBTL mode. I'm new to all this, but am keen to understand it! Before getting to the optimal circuit, I thought I'd try to understand the basic implementation.
I've read through the data sheet and looked at the basic implementation schematic. I understand it for the most part (mostly because the DS explains it and there are only parts related specifically to the functioning of the TPA chip... simple).
I then moved on to the EVM schematic as I understand it is more of a complete implementation rather than just the basic circuit. I understand the right hand side of the schematic (the output side), and note the addition of the 330pF + 10R pre-inductor filters.
I'm a bit confused by the left hand side though (the input side). My knowledge of circuits is self-taught, and thin at best, so I'm not sure how the auxiliary pieces of the circuit (e.g. Q1 around the mute pin) change its operation.
I would be very grateful if someone could run through the components on the input side and group them into units that perform specific functions.
I've attached a PDF from TI with the EVM Rev C schematic. Does anyone know if there's a later revision available?
Here is an image of the input side schematic: http://i.imgur.com/089dfKB.png
Any help would be appreciated.
Thanks,
Chris
I'm trying to understand the optimal implementation circuit for the TI TPA3116D2 chip in PBTL mode. I'm new to all this, but am keen to understand it! Before getting to the optimal circuit, I thought I'd try to understand the basic implementation.
I've read through the data sheet and looked at the basic implementation schematic. I understand it for the most part (mostly because the DS explains it and there are only parts related specifically to the functioning of the TPA chip... simple).
I then moved on to the EVM schematic as I understand it is more of a complete implementation rather than just the basic circuit. I understand the right hand side of the schematic (the output side), and note the addition of the 330pF + 10R pre-inductor filters.
I'm a bit confused by the left hand side though (the input side). My knowledge of circuits is self-taught, and thin at best, so I'm not sure how the auxiliary pieces of the circuit (e.g. Q1 around the mute pin) change its operation.
I would be very grateful if someone could run through the components on the input side and group them into units that perform specific functions.
I've attached a PDF from TI with the EVM Rev C schematic. Does anyone know if there's a later revision available?
Here is an image of the input side schematic: http://i.imgur.com/089dfKB.png
Any help would be appreciated.
Thanks,
Chris
Q1 is switched on, its collector is at ground potential as near as it gets and controls the mute pin, pin 12. When the button is pressed, the base of Q1 goes low switching the transistor off and allowing pin 12 to go high, muting the chip.
Thanks JonSnell. Why is Q1 also connected to the FAULT pin?
When the amplifier goes into FAULT, it should be turned off, so why mute?
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