Hello everybody, i've been testing the TPA3116D2 amplifier chip, and the one problem i find with it is that it gives a large "pop" on the speakers on power on, so after looking at the datasheet : http://www.ti.com/lit/ds/symlink/tpa3116d2.pdf
i though it was clever to mute the amplifier for about 1 seconde after power on with some srt of circuit that ouputs HIGH for 1 seconde after power on.
Any ideas?
Thank you 🙂
i though it was clever to mute the amplifier for about 1 seconde after power on with some srt of circuit that ouputs HIGH for 1 seconde after power on.
Any ideas?
Thank you 🙂
RC timer, that's a good though, thanks 🙂
and about the capacitor between SD - GND how would i calculate the capacitor value?
and about the capacitor between SD - GND how would i calculate the capacitor value?
It charges through the 100K ohm resistor so 10nF=1s from tau=RC => seconds = ohm * farads
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So, i've tried a 10nf ceramic capacitor between sdz and ground, and nothing :/, dones't even change the status during music if i pull it out and connect it again.
It will only work on power up, and only if the bulk capacitors are already discharged fully, ie. under normal circumstances.
The unknown here is the SD trigger point. You can try different values, for example 100µF.
EDIT: oops, I wrote nF, that should be µF naturally (as given by the equation above).
If trigger point is 2V, supply voltage is 20V, resistor is 100K, and capacitor 100µF. That should equal 1s delay.
http://ladyada.net/library/rccalc.html
EDIT2: Trigger voltage is indeed 2V, so 100µF=1.05s.
The unknown here is the SD trigger point. You can try different values, for example 100µF.
EDIT: oops, I wrote nF, that should be µF naturally (as given by the equation above).
If trigger point is 2V, supply voltage is 20V, resistor is 100K, and capacitor 100µF. That should equal 1s delay.
http://ladyada.net/library/rccalc.html
EDIT2: Trigger voltage is indeed 2V, so 100µF=1.05s.
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You are a genious my friend,
i connected a 100uF capacitor and sure enough, no POP! 😀D
Just another thing, is there a problem on using 16V 100uF capacitors? as i don't know whether there is the full PVCC on this pin or not.
Thanks. But not really.
There's full Vcc voltage but not a lot of current. Should be a 25V part for a permanent installation.
There's full Vcc voltage but not a lot of current. Should be a 25V part for a permanent installation.
I did a 10uF 25V, so i'll leave it be like this 🙂, only mild pop now, and helped switch sparking.
just one last question, can a put an NPN transistor between SD and ground too? then, if i fed the transistor i would turn off the amplifier.
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