TDA1521/N4 View Datasheet(PDF) - Philips Electronics
Part Name
Description
MFG CO.
TDA1521/N4 Datasheet PDF : 14 Pages
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Philips Semiconductors
2 x 12 W hi-fi audio power amplifier
Product specification
TDA1521
TDA1521Q
APPLICATION INFORMATION
Input mute circuit
The input mute circuit operates only during switching on and off of the supply voltage. The circuit compares the 1/2 supply
voltage (at pin 3) with an internally fixed reference voltage (Vref), derived directly from the supply voltage. When the
voltage at pin 3 is lower than Vref the non-inverting inputs (pins 1 and 9) are disconnected from the amplifier. The voltage
at pin 3 is determined by an internal voltage divider and the external 100 µF capacitor.
During switching on, a time delay is created between the reference voltage and the voltage at pin 3, during which the
input terminal is disconnected, (as illustrated in Fig.3).
Fig.3 Input mute circuit; time delay.
July 1994
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