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LA42105 Datasheet(PDF) 4 Page - Sanyo Semicon Device

Part No. LA42105
Description  Monolithic Linear IC Audio Output for TV application BTL 5W × 1ch Power Amplifier
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Maker  SANYO [Sanyo Semicon Device]
Homepage  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LA42105 Datasheet(HTML) 4 Page - Sanyo Semicon Device

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LA42105
No.A0741-4/7
External Components
C1
: Input coupling capacitors. A value of 0.47
μF is recommended.
The input pin potential is 0.7V.
C2
: Capacitor which sets the starting time of the ripple filter and amplifier. A value of 100
μF is recommended.
C3, R1
: Capacitor and resistor for muting function. C3 is necessary even when the mute function is not used.
C4
: This capacitor increases the oscillator margin. We recommend a value of 0.1
μF.
C5
: Power supply capacitor.
1. Muting function (pin 7)
The muting function is turned on when the pin 7 voltage is 1.5V (minimum) or higher.
The VM applied voltage is set so that the pin 7 voltage will be 1.5V or higher.
The muting time constant is determined by an C3, R1 circuit, and the component values must be determined by a
careful analysis, since they are related to impulse noise that occurs when the muting function is turned on or off. Also
note that since C3 affects the occurrence of impulse noise when the amplifier is turned on or off, it will be required if
the muting function is not used.
2. Standby function (pin 6)
The amplifier is turned on by applying a level of 2.5V (minimum) or higher to pin 6.
Pin 6 control voltage
Pin 6 voltage
Amplifier
Standby
0 to 0.5
Off
On
2.5 to VCC
On
Off
The limit resistor RSTB may be inserted if the VSTB applied voltage is comparatively high and there is a need to
suppress the pin 6 sink current.
Mute
Standby
+
7
C3
10
μF
/6.3V
R1
15k
Ω
7.5k
Ω
2k
Ω
1k
Ω
VCC
VM
20k
Ω
6
RSTB
1.5k
Ω
15k
Ω
VCC
2VBE
VS
30k
Ω


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