TPA3132D2 - delay and emergency shut-down (anti-pop) - also for TPA3116 / TPA3118

Who delay of 10ms (TPA3132D2, TPA3116D2, TPA3118D2) is not sufficient (E.g. when using large time constants/coupling capacitors) and want to do something against the "" PLoP turn off can help with 2 comparators, and few passive components.

Dual comparator

The circuit operates in the range 10-26V, MUTE is getting delayed on power-on and a rapid shutdown is done via SDZ latching in the absence of operating voltage.

TPA3132D2 Antipop Schematic 1.0The delay time (MUTE high) is set by C29, 1uF ~ 200ms. The operating conditions are shown in the following diagrams:

TPA3132D2 Antipop 20V Power-Cycle

TPA3132D2 Antipop 10V Power-Cycle

TPA3132D2 Antipop 20V FAULTZ Event


Following minimal circuit proved working in practice consisting of resistor & capacitor as the time constant and a diode for fast shut-down.

TPA3132D2 simple anti pop schematic

TPA3132D2 simple anti pop schematic

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6 responses

  1. Vladimir says:

    but the nominal of R26 is not written

    • 360customs says:

      Sorry for that, i’d recommend the “R C D” circuit, it is proven to work.

      • Vladimir says:

        Yes, but it is does not avoid a pop after shout dawn

        • 360customs says:

          Did you tested it like shown? It actually works fine here on the TPA3132D2 boards. (Even on a hard shut down/power loss)
          Is SDZ connected to FAULTZ?

          • Alex Shults,,en,15. December 2017,,en,8:58,,en says:

            I have 5.1 Amplifier on 4 TPA3116D2, there’s POP problem on shut-down.
            All mute inputs are linked together .
            Does your schematic will work on it?

            P.S. As i figured out in my amplifier combined mute line connected to 10K resistor (on the ground) and non-polar electrolite 2.2uF (i suppose, to VGDD). But this native solution works crappy :(.

  1. 6 February 2015

    […] Update (09.01.2015): Revision 0 d in operation update (06.02.2015): switch-on delay and emergency shut-down as an option [...]

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