AN5272 View Datasheet(PDF) - Panasonic Corporation

Part Name

Description

Manufacturer

AN5272

4.0 W ×2 (18 V, 8 Ohm) Power Amplifier with Variable Audio Output and Volume Control

Panasonic Corporation 

AN5272

ICs for Audio Common Use

s Technical Information (continued)

2.Application Note (continued)

4) 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 AN5272 is determined by the capacitance value of CRF. If value of the CRF is smaller, VO

would 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

5) Stand-by circuit

Stand-by function can be implemented in the AN5272 by external solution. It is realised by pulling the RF voltage

to low and output voltage would follow RF as shown in the diagram.

5V

Stand-by ON 5 V

0V

OFF

RF 6

100 µF

DC voltage

1/2VCC

5V

(Pin7 & Pin12)

VO (DC)

Stand-by

Time

6

Share Link: