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We are promoting TPA3130D2 for a audio system, analog input and Mono 4ohm/20W output.
The customer faced pop noise problem before, hence serious for mute function.
TPA3130D2 has 2 pins, SDZ & MUTE to be used for mute fuction(turn off output transisters).
These are his questions regarding those 2 pins to consider which is the best to realize the
1. SDZ looks like to be able to clear protection latch.
Will other setting such as Gain setting be cleared due to SDZ pin low (like reset)?
2. I wonder MUTE will be simply turn off output transisors keeping all setting.
3. Page 6 on the data sheet, defines ton/toff.
Can these parameters be referred for MUTE?
4. SDZ will be the best during power off/on stage.
Which is the best way to realize mute fuction(set no output, normal operation stage), SDZ or MUTE?
Hoping to get your advices.
In reply to Matt Lauer:
Hallo Dear Matt
I'm waiting your samples of the TPA3116, to realize a new ClassD Amp for Italy market. In the meantime I'm studing the Pcb. I've some doubts about the MODE pin configuration. In all diagrams you have a switch, indicating MUTE, but in the real application I haven't any switch ! How to command the Mute pin ??
waiting for your kind reply I remain..
thank you in advance
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In reply to Franco Vecchi:
We're glad to hear you're using TPA3116 for this new application! What are you referring to when you say "the real application"? On the EVM / PCB, the MUTE pin is triggered by a fault condition, or by a switch, as you said. You need some way to bring it low if you want to mute. I'm not sure I understand your question...
Best regards,Arnold Zhang
In reply to Arnold Zhang:
as "real application" I intend that in the customer PCB they don't have any switch, the Mute must be automatic when they switch-on the amp, right?
I know that I must control the Mute pin , only I fear to have pop-noise in the speaker, when switch on or switch off ! How to avoid any pop noise?
Maybe a capacitor as soft-start it's enough?
Pls suggest a schematic for the MUTE control...without switch!
thanks in advance
In reply to John Grace:
This is a circuit that I have designed and successfully implemented onto a Yuan Jing Audio amplifier based on TPA3116D2 , to prevent pop noise when turning on:
At power-on (21V) this circuit holds to high logical level MUTE pin for about 2 seconds. This delay is shorter at lower operating voltages, but it is enough to avoid any bump (tested from 7 to 26V).
The delay can be adjusted by changing the values of C1.
Wait a few seconds after shutting down the amplifier before turning it back on again, to allow power supply capacitors and C1 to discharge, otherwise it is possible to hear a bump.
This circuit cannot prevent popping noise at power off. In such a case a circuit to detect that AC mains voltage has been switched off is needed. It could be done, for example, with an optocoupler and a voltage comparator.
The only concern was about the negative voltage on MUTE pin that is present during power-off transient period, due to discharge of capacitor C1.
For TPA3116D2 the absolute negative limit voltage on MUTE input is only -0.3V!! (see datasheet).
The problem has been solved with a protection schottky diode D1 across MUTE pin and gnd .
Use only a small signal schottky diode type, like a BAT48 diode, as indicated in the schematic, that will clamp voltage on MUTE pin within the maximum absolute value.
DO NOT use silicon diodes!
Resistor R1, and upper 100K smd, limit discharge current to less than 0.1mA.
At 0.1mA (Tj = 25° C) BAT48 has a maximum forward voltage drop of only 0.25V and it is well suited for the scope.
1PS76SB40 diode (package=SOD323, marking code S4) is also a good choice. I've mounted it on top of smd resitor (see photo below).
Note: I've connected R1 to an smd resitor (100K) connected to SDZ/FAULTZ and PVCC on the other side, only for convenience, because it is easy to implement on my board.
This connection does not interfere with the proper operation of the amplifier, anyways it is possible to connect R1 directly to PVCC. In such a case increase R1 value to 220K.
Any comment/suggestion is welcome!
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