LA4613 Datasheet, PDF (4/7 Pages) Sanyo Semicon Device – Audio Power Amplifier for Radio Cassette Recorders

LA4613
Pin Descriptions
1. Standby switching function (9)
Power is switched ON and OFF by controlling the High and Low states at pin 9,
respectively (standby). To switch power ON, apply 1.5V or more, or 800 µA to
pin 9.
Current supplied to pin 9 =.. ^{Applied voltage} + ^{Applied voltage – VBE (approx. 0.7V)}
2 kΩ
2 kΩ
9
• When directly connecting the microcontroller with this pin, add a
resistor in series to optimize the current for the microcontroller.
VCC
To bias circuit
2kΩ
2kΩ
2. Input pins (11,13)
Voltage at the input pins is approx. 2 V_BE (1.4V).
Input impedance is approx. 30 kΩ.
• The recommended value for the input capacitor is 0.22 µF, but this can be varied in order to adjust the starting time
(ts). (The starting time is the time required from applying voltage to the standby pin until sound output is ob-
tained.)
Input capacitator
Starting time t_s
1.0 µF
0.2s
2.2 µF
0.3s
3.3 µF
0.5s
4.7 µF
0.65s
10 µF
1.5s
3. Filter (decoupling) pin (7)
Pin voltage is approx. 1/2 V_CC.
The recommended value for the filter capacitor is 100 µF.
When capacitance is lower, pop noise when setting the standby pin to Low (power OFF) will increase.
Filter capacitor= 100 µF
AC voltage (100 mV)
Output DC voltage
Filter capacitor= 47 µF
AC voltage (200 mV)
Output DC voltage
A11495
A11496
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