AN5272 Panasonic - SSG, AN5272 Datasheet - Page 5

• Manufacturer Part Number: AN5272
• Description: IC AUDIO AMP 2CH 4W SIL-12 W/FIN
• Manufacturer: Panasonic - SSG
• Type: Class ABr

Specifications of AN5272

• 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: 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) Oscillation
Technical Information (continued)
The voltage gain of the AN5272 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 :
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.
G
which is fixed in
internal circuit.
AN5272
V
input 4 dB
Fig. Volume control interface circuit for AN5272
Volume
control
300
G
VI
3
Pin8
11
C4
2.2 F
18 k
R4
C
R2
Pin7
NF
12
10 F
R1
R5
12 k
Pin7,12
C
R
Microcomputer IC
0.047 F
20
output
PWM
1000 F
R1 is always fixed at 20 k .
R2 is variable.
G
Typical values are : R
G
G
VO
VO
VTOTAL
20 log (R
20 log (20 k/1 k)
26 dB
G
4 dB
30 dB
R
VI
L
1
/R
8
G
Fig. Volume characteristic of AN5272
26 dB
2
VO
)
Volume
attenuation
1
0
20 k , R
0.6
Volume at Pin3
2
1 k
AN5272
5 (V)
5