AN5273 Просмотр технического описания (PDF) - Panasonic Corporation

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AN5273

4.0 W ×2 (18 V, 8 Ω) Power Amplifier with Mute Function and Volume Control

Panasonic Corporation 

AN5273

ICs for Audio Common Use

s Technical Information (continued)

2.Application Note (continued)

4) Oscillation

To prevent oscillation, it is advisable to use RC (Zobel network) at output. C of polyester film capacitor has smaller

characteristic fluctuation with temperature and frequency. The resistor R connected in series with C is effective for

phase correction at high frequency, and as a result, it improves the oscillation allowance.

1000 µF

Pin7

12

C 0.047 µF

R 20 Ω

RL = 8 Ω

5) Power-ON/OFF pop-noise elimination

The output pins 7, 12 and VO, during power turn ON and OFF are shown below :

VCC

VO

Pin7

&

Pin12

33 µF

47 µF

CRF = 100 µF

Turn ON

time

Turn OFF

time

CRF

CVCC

The turn ON time in the AN5273 is determined by the capacitance value of CRF. If value of the CRF is smaller, VO

will turn ON faster.

The turn OFF time is dependent on the capacitance value of CVCC. Pop-noise would occur when VCC voltage

declines faster than RF voltage. To solve this, increase the discharge time of VCC by increasing the capacitance

values of CVCC.

The recommended values of capacitance for CVCC and CRF are shown below :

No.

CRF

CVCC

Recommended Operating VCC Range

Unit

1

33 µF

470 µF

14.5 to 27.5

V

2

47 µF

470 µF

12.2 to 27.5

V

3

100 µF 1000 µF

12.2 to 27.5

V

6

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