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Part Number: TPA2012D2
Could you let me know if there is a restriction for power-up and down condition of TPA2012DA?
I wonder there is a threshold voltage for internal logic reset (PoR) etc...
Can it be powered from midpoint voltage?
TPA2012D2 is powered only by PVDD/AVDD, which are actually connected to the same voltage. So as soon as this supply voltage is above 2.5V, it is ready to go.You can pull-down SDR and SDL to keep the device in shutdown mode while the supply voltage ramps up, once the supply is completely powered up you can release SDR and SDL.
For best performance, you should either power up or power down the supply. What do you mean by midpoint voltage?
Best regards,-Ivan SalazarApplications Engineer - Low Power Audio & Actuators
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In reply to Ivan Salazar:
Thank you for your reply.
When power supply doesn't have discharge circuit, PVDD/AVDD of TPA2012 is not fully discharged in power off - on cycle.
If system powers off and on quickly, VDD wil transit like 5V -> 2V -> 5V.
Is this O.K.? All we have to do is holding SDL and SDR low during power on - off cycle?
In reply to A.Sakai:
Holding SDR and SDL low is the correct thing to do. I think this should be OK as long as the device is in shutdown while supply voltage is not stable.
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