This post explains for the Audio IC.
The Part Number is TB2929AHQ.
The function of this semiconductor is 47W, BTL x 4-ch Audio Power IC.
The package is HZIP 25 Pin Type
Preview images :
The TB2929AHQ is a four-channel BTL power amplifier for car audio applications. This IC has a pure complementary P-ch and N-ch DMOS output stage, offering maximum output power (POUT MAX) of 47W. It includes a standby switch, mute function and various protection features.
1. High output power, low distortion, and low noise property
2. Build-in AUX-IN (pin25)
3. Built-in various mute functions (low voltage, standby on/off)
4. Built-in standby switch (pin4)
5. Built-in mute switch (pin22)
Mute switch :
The audio mute switch is enabled by setting pin 22 Low. R1 and C4 determine the time constant of the mute. The time constant affects pop noise generated when power or the mute is turned on or off; thus, it must be determined on a per-application basis.
1. Power IC developed for car audio applications.