參數(shù)資料
型號: AN5272
廠商: PANASONIC CORP
元件分類: 音頻控制
英文描述: 4.0 W X 2 (18 V, 8 ohm) Power Amplifier with Variable Audio Output and Volume Control
中文描述: 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PSFM12
封裝: HSIP-12
文件頁數(shù): 5/6頁
文件大?。?/td> 65K
代理商: AN5272
5
ICs for Audio Common Use
AN5272
I
Technical Information (continued)
2.Application Note
1) Voltage gain
The voltage gain of the AN5272 can be varied by changing the resistor R2 as shown below :
R1 is always fixed at 20 k
.
R2 is variable.
G
VO
=
20 log (R
1
/R
2
)
Typical values are : R
1
=
20 k
, R
2
=
1 k
G
VO
=
20 log (20 k/1 k)
=
26 dB
G
VTOTAL
=
G
VI
+
G
VO
=
4 dB
+
26 dB
=
30 dB
2) DC volume control
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 :
3) 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.
3
R5
12 k
C4
2.2
μ
F
PWM
output
Microcomputer IC
R4
18 k
Fig. Volume control interface circuit for AN5272
300
AN5272
Volume
control
Fig. Volume characteristic of AN5272
Volume
attenuation
0
0.6
Volume at Pin3
5 (V)
Pin8
11
Pin7,12
R2
R1
C
NF
=
10
μ
F
G
V
input
=
4 dB
which is fixed in
internal circuit.
G
VI
0.047
μ
F
R
L
=
8
20
C
Pin7
12
R
1000
μ
F
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