LA42051 Datasheet, PDF (4/6 Pages) Sanyo Semicon Device – Audio Output for TV Application 5W×1ch Power Ampilfier

LA42051
1. Standby function (pin 5)
The amplifier can be turned ON/OFF through HIGH/LOW
control of pin 5.
The amplifier is turned ON when the voltage of 1.0V (min)
or more is applied to pin 5.
Pin 5 control voltage
Voltage of pin 5
0 to 0.5
1.0 to 5.0
Amplifier
OFF
ON
Standby
ON
OFF
Insert a limiting resistor (RSTB) when the inrush current to
pin 5 is to be limited if the application voltage to VS is high.
Example: when VS=5V, RSTB=5.1kΩ is inserted
The inrush current to pin 5 is about 750μA and the potential
of pin 5 is about 1.2V.
2. Ripple filter and MUTE function (Pin 1)
The potential of pin 1 is about 1/2 VCC. Muting to control the output signal becomes effective by shifting down pin
1 with 300 to 500Ω. Note that the MUTE suppression rate decreases when the resistance exceeds 750Ω.
3. Input pin (Pin 4)
The potential of input pin is 2VBE (about 1.4V). Therefore, the polarity must be determined according to the DC
potential of the circuit connected to the previous step of LA42051. The standard input resistance is 30kΩ.
For the input capacitor, 1.0μF is recommended. The starting time with power ON in this case is about 0.2s.
The starting time becomes about 1.5s when the capacitance is 10μF.
4. P.P (Pin 6)
This is the pin to attenuate the pop noise during power ON/
OFF. Note that, with the capacitance set at 10μF or more,
the sound may remain because the signal is not cut off.
Pin 6 potential = ^{VCC - VCE (about 0.3V) -5.6V} + 5.6V
2
Cautions for use
1. As power fault (power supply - output short-circuit) and ground fault (GND - output short-circuit) protective circuits are
not incorporated, due care must be taken during use.
2. The thermal protective circuit is incorporated, which is activated when the junction temperature (Tj) rises to about 160°C or
more, controlling the output gradually to the attenuated condition.
3. During use near the maximum rating, the product may suffer damage if the slightest fluctuation of condition exceeds the
maximum rating. Be sure to use the product within a range which never exceeds the maximum rating while allowing
sufficient margin for the supply voltage, etc.
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