AN5273 Panasonic - SSG, AN5273 Datasheet - Page 5

• Manufacturer Part Number: AN5273
• Description: IC AUDIO AMP 2CH 4W SIL-12 W/FIN
• Manufacturer: Panasonic - SSG
• Type: Class ABr

Specifications of AN5273

• Output Type: 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 4.1W x 2 @ 8 Ohm
• Voltage - Supply: 12.2 V ~ 27.5 V
• Features: Mute, Short-Circuit and Thermal Protection, Volume Control
• Mounting Type: Through Hole
• Package / Case: 12-SIP + Tab
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ICs for Audio Common Use
2.Application Note
1) Voltage gain
2) DC volume control
3) Mute control
Technical Information (continued)
The voltage gain of the AN5273 can be varied by changing the resistor R2 as shown below :
The DC volume control range is 0 V to 5 V. This range is used in order to be easily controlled by micro-computer
using PWM output. The recommended circuit and volume attenuation characteristic are shown below :
Mute is ON when 5 V is applied to Pin1. Then Q1 would turn ON and able to drive other part of the circuits. The
external RC components provide a time constant for switching ON and OFF.
G
which is fixed in
internal circuit.
AN5273
V
Mute
0 V
Threshold voltage at Pin1 :
input 4 dB
Fig. Volume control interface circuit for AN5273
Volume
control
300
G
OFF
VI
ON
3
5 V
Pin8
100 k
11
C4
2.2 F
R
18 k
R4
C
R2
NF
C
1.0 F
0 V
Z
10 F
R1
R5
12 k
MUTE
Pin7,12
Mute OFF
1
Microcomputer IC
output
PWM
20 k
R1 is always fixed at 20 k .
R2 is variable.
G
Typical values are : R
G
G
1.8 V 2.1 V
VO
VO
VTOTAL
20 log (R
20 log (20 k/1 k)
26 dB
Q1
G
4 dB
30 dB
VI
The purpose of the Mute is to
attenuate the AC signal before
it goes to the output.
1
/R
G
Fig. Volume characteristic of AN5273
26 dB
2
VO
)
Volume
attenuation
Mute ON
1
0
20 k , R
0.6
Volume at Pin3
2
1 k
5 V
AN5273
5 (V)
5