AN5270 Просмотр технического описания (PDF) - Panasonic Corporation

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производитель

AN5270

4.3 W ×1(8Ω) Power Amplifier with Volume Control and Tone Control

Panasonic Corporation 

ICs for Audio Common Use

AN5270

s Technical Information (continued)

• Power-off pop-noise countermeaasure (for study consideration only)

To prevent power-off shock noise, please ensure that VCC2 (18 V) declines faster than VCC1 (12 V). In addition, to

ensure that VCC1 variation will not cause any 'pop' , one suggested countermeasure is to connect a condenser between

Pin6 and Pin9 (e.g. 47 µF, use non-polarity type if possible).

RF

6

C6

47 µF

Cpop

47 µF

NP

VCC2

9

2200 µF

Fig. One suggested counter-measure against power-off 'pop' for AN5270.

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.

• THD improvement (for study consideration only)

1

6

47 µF

C6

Fig. THD improvement circuit.

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.

9

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