LA42051

No.A1037-4/6

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

Amplifier

Standby

0 to 0.5

OFF

ON

1.0 to 5.0

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=5.1k

Ω is inserted

The inrush current to pin 5 is about 750

μA 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 500

Ω. 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 30k

Ω.

For the input capacitor, 1.0

μF 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 10

μF.

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 10

μF or more,

the sound may remain because the signal is not cut off.

Pin 6 potential =

+ 5.6V

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.

VCC - VCE (about 0.3V) -5.6V

2