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AN5272

P1-P3P4-P6
4
AN5272 ICs for Audio Common Use
■ Technical Information
1.Characteristic Curve Chart
P
O
, THD V
IN
G
V
, THD f
G
VAO
fP
O
V
CC
DC volume characteristics P
D
T
a
Output power P
O
(W)
Total harmonic distortion THD
(%)
0.01
10
1
0.1
0.1
100
10
1
1000100101
Input voltage V
IN
(mV)
V
CC
= 18 V
R
L
= 8 Ω
f = 1 kHz
Vol. = max.
P
O
THD
Voltage gain G
V
(dB)
100k10k1k10 100
Frequency f (Hz)
G
V
V
CC
= 18 V
R
L
= 8 Ω
V
IN
= 90 mV
Vol. = max.
22
24
0.2
0.4
0.6
0.8
1.0
26
28
30
Total harmonic distortion THD
(%)
0
THD
Voltage gain G
VAO
(dB)
100k10k1k10 100
Frequency (Hz)
V
CC
= 18 V
R
L
= 8 Ω
V
IN
= 90 mV
Vol. = max.
0
14
2
4
6
8
10
12
G
V
0
2
4
6
8
10
10 12 28
Supply voltage V
CC
(V)
Output power P
O
(W)
14 16 18 20 22 24 26
f = 1 kHz
THD = 10 %
Vol. = max.
R
L
= 8 Ω
R
L
= 16 Ω
−70
−60
−50
−40
−30
−20
−10
0
05
DC volume (V)
Volume attenuation (dB)
4321
V
CC
= 18 V
R
L
= 8 Ω
V
IN
= 90 mV
f = 1 kHz
0
0 25 150
周囲温度 T
a
(°C)
許容損失 P
D
(W)
10
3.0
10.4
20
17.9
25
30
40
50
60
31.3
41.7
62.5
50 75 100 125
R
th( j−c)
= 2 °C/W
R
th( j−a)
= 42 °C/W
1. No heat sink
2. 10 °C/W heat sink
3. 5 °C/W heat sink
4. 3 °C/W heat sink
5. 2 °C/W heat sink
6. 1 °C/W heat sink
7. Infinity heat sink
7
6
5
4
2
1
3
5
ICs for Audio Common Use AN5272
■ 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 kΩ.
R2 is variable.
G
VO
= 20 log (R
1
/R
2
)
Typical values are : R
1
= 20 kΩ, R
2
= 1 kΩ
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 kΩ
C4
2.2 µF
PWM
output
Microcomputer IC
R4
18 kΩ
Fig. Volume control interface circuit for AN5272
300 Ω
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 µF
G
V
input = 4 dB
which is fixed in
internal circuit.
G
VI
0.047 µF
R
L
= 8 Ω
20 Ω
C
Pin7
12
R
1000 µF
6
AN5272 ICs for Audio Common Use
■ Technical Information (continued)
2.Application Note (continued)
4) Power-ON/OFF pop-noise elimination
The output pins 7, 12 and V
O
, during power turn ON and OFF are shown below :
The turn ON time in the AN5272 is determined by the capacitance value of C
RF
. If value of the C
RF
is smaller, V
O
would turn ON faster.
The turn OFF time is dependent on the capacitance value of C
VCC
. Pop-noise would occur when V
CC
voltage
declines faster than RF voltage. To solve this, increase the discharge time of V
CC
by increasing the capacitance
values of C
VCC
.
The recommended values of capacitance for C
VCC
and C
RF
are shown below :
No. C
RF
C
VCC
Recommended Operating V
CC
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.
RF
6
V
CC
10
C
VCC
C
RF
V
CC
V
O
Pin7
&
Pin12
Turn ON
time
Turn OFF
time
C
RF
= 100 µF
33 µF
47 µF
RF
1/2V
CC
5 V
6
100 µF
ON
OFF
5 V
5 V
0 V
Stand-by
DC voltage
(Pin7 & Pin12)
Time
Stand-by
V
O
(DC)
P1-P3P4-P6

AN5272

Mfr. #:
Buy AN5272
Manufacturer:
Panasonic
Description:
IC AUDIO AMP 2CH 4W SIL-12 W/FIN
Lifecycle:
New from this manufacturer.
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