an5270 Panasonic Corporation of North America, an5270 Datasheet - Page 9

• Manufacturer Part Number: an5270
• Description: 4.3 W X 1 8ohm Power Amplifier With Volume Control And Tone Control
• Manufacturer: Panasonic Corporation of North America

ICs for Audio Common Use
Power-off pop-noise countermeaasure (for study consideration only)
THD improvement (for study consideration only)
Technical Information (continued)
To prevent power-off shock noise, please ensure that V
ensure that V
Pin6 and Pin9 (e.g. 47 F, use non-polarity type if possible).
This effect of Cpop is to discharge C6 gradually as soon as power is switched off.
However, it must be noted that the necessity of this countermeasure is dependent upon the set design and other timing
considerations.
Instead of connecting the negative terminal of C6 to ground, when that terminal is connected to Pin1, it is noticed that
THD is improved considerably.
CC1
variation will not cause any 'pop' , one suggested countermeasure is to connect a condenser between
Fig. One suggested counter-measure against power-off 'pop' for AN5270.
47 F
C6
RF
6
Fig. THD improvement circuit.
1
47 F
Cpop
NP
47 F
C6
CC2
V
(18 V) declines faster than V
CC2
9
6
2200 F
CC1
(12 V). In addition, to
AN5270
9