LV47004P-E Datasheet, PDF (6/11 Pages) ON Semiconductor – 4-Channel BTL Power Amplifier for Car Audio Systems

LV47004P
5. Sound quality (low frequencies)
By varying the value of input capacitor, low-frequency characteristic can be improved.
However, it is concerned the shock noise. Please confirm in each set when the capacitance value varies.
6. Pop noise
For pop noise prevention, it is recommended to use the muting function at the same time.
 Please turn on the muting function simultaneously with power supply on when the amplifier is turned on. Next, turn
off the muting function after the output DC potential stabilization.
 When the amplifier is turn off, turn off the power supply after turning on the muting function.
7. Oscillation stability
Pay due attention on the following points because parasitic oscillation may occur due to effects of the capacity load,
board layout, etc.
Board layout
 Provide the VCC capacitor of 0.1F in the position nearest to IC.
 PREGND must be independently wired and connected to the GND point that is as stable as possible, such as the
minus pin of the 2200F VCC capacitor.
In case of occurrence of parasitic oscillation, any one of following parts may be added as a countermeasure.
Note that the optimum capacitance must be checked for each set in the mounted state.
 Series connection of CR (0.1F and 2.2) between BTL outputs
 Series connection of CR(0.1F and 2.2) between each output pin and GND.
No.A1798-6/11