3.1 Power Down Sequence

1. Mute TAS5760 HP.
2. Turn down SOC 3.3 V (output impedance keeps low. It can avoid pop).
3. Shutdown HP 3.3 V.

Figure 4 is frequency response TINA simulation of the typical line drive circuit (subwoofer stereo to mono line driver). The frequency response from 20Hz to approximately 200Hz is within ±3dB range.

In Figure 5, the big DC level transient at the line driver input, but there is no transient voltage at line driver output. The reason is SOC 3.3 V power and line driver 3.3 V power are separated. The line driver 3.3 V power was not provided while there is big DC level transient from SOC's output. Figure 6 shows that the case SOC and line driver share the same 3.3 V power supply. The voltage drop in channel 1 due to 3.3 V power supply for SOC and line driver turns off at the same time. Channel 2‘ｓ waveform shows the line driver of TAS5760LD output transient around -11mV. CH1 is input from SOC. R CH2 is line driver output. CH3 is (DR_MUTE )̅ controlled waveform by SOC’s GPIO. CH4 is 3.3V for line driver power.