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

LV47004P
External Components
Part Name Recommended Value
Purpose
Remarks
C1 to C5
C6
C7
0.47F
22F
2200F
Cuts DC voltage
Reduces ripples
Reduces pop noise
Ripple filter
The larger the constant value, the lower the cut-off frequency
The values of C1 to C5 must be the same
The larger the constant value, the longer the amplifier ON/OFF time
Eliminating power supply ripples
C8
0.1F
Improves oscillation stability
Reducing high-frequency noise
C9
1F
Reduces pop noise
The larger the constant value, the longer the mute ON/OFF time
R1
10k
Reduces pop noise
The larger the constant value, the longer the mute ON/OFF time
R2
4.7k
Pull-up resistor
* The components and constant values within the test circuit are used for confirmation of characteristics and are not guarantees that incorrect or trouble will not
occur in application equipment.
Description of Operation
1. Standby switch function (pin 4)
Threshold voltage of the pin 4 is set by about 2VBE.
The amplifier is turned on by the applied voltage of 2.5V or more. Also, the amplifier is turned off by the applied
voltage of 0.5V or less.
STBY
4
10kΩ
30kΩ
Fig1 Standby equivalent circuit
2. Muting function (pin 22)
The muted state is obtained by setting pin 22 to the ground potential, enabling audio muting.
The muting function is turned on by the applied voltage of 1V or less to the resistance of 22pin (Mute pin). And the
muting function is turn off tjis pin opens.
Also, the time constant of the muting function is determined by external capacitor and resistor constants.
It is concerned with a pop noise in amplifier ON/OFF and mute ON/OFF. After enough examination, please set it.
10kΩ
1μF ⁺
MUTE
22
200Ω
about
50μA
18kΩ
MUTE
OFF
ON
about
2.5V
Fig2 Mute equivalent circuit
No.A1798-4/11