LA4743A
Continued from preceding page.
Pin No. Function DC voltage [V]
Notes
Input amplifier
ST-BY power
supply line
Internal equivalent circuit
11
IN1
12
IN2
14
IN4
15
IN3
• Input amplifiers that require no
3.1
capacitor in the input noise filter.
13
PRE GND
30 kΩ
VREF
100 Ω
11
12
14
15
Bias circuit
power supply line
5 pF
1 kΩ
Inverter
amplifier
A13500
20 kΩ
VREF
16 ON TIME MUTE 2.6
• Amplifier turn-on time control circuit
• Impulse noise prevention circuit
• With a 22 µF capacitor, the turn-on 16
time will be 0.6 s.
200 Ω
2 kΩ
40 kΩ
10 kΩ
2 kΩ
13 kΩ
Input amplifier
ST-BY power
supply line
3 kΩ
1 kΩ
A13501
22
MUTE
4.1
• The muting function is activated when
the applied voltage is under 1 V.
VREF
Amplifier
bias circuit
25
N.C.
7.5 kΩ 10 kΩ
100 Ω
22
100 kΩ
VREF
A13502
No. 6629-5/9