PANASONIC AN5272

ICs for Audio Common Use
AN5272
4.0 W × 2 (18 V, 8 Ω) Power Amplifier with
Variable Audio Output and Volume Control
Unit : mm
■ Overview
12
7.7±0.3
(10.0)
29.6±0.3
(1.27)
20.0±0.3
+0.15
R1.8
21.9±0.3
■ Applications
3.5±0.3
1.45±0.15
1
(1.2)
19.1±0.3
1.80±0.15
1.2±0.1
(12.5)
+0.10
0.25 –0.05 2.54
0.6
• Built-in DC volume control
• Built-in thermal protection circuit
• Built-in over current protection circuit
• 2 Variable Audio Output (VAO)
• VCC operating range : 12.2 V to 27.5 V
0.6 –0.05 (1.27)
■ Features
φ3.6
(10.0)
29.75±0.30
28.0±0.3
(1.3)
The AN5272 is a monolithic integrated circuit designed
for 4.0 W (18 V, 8 Ω) output audio power amplifier. It is
a dual channel SEPP IC suitable for stereo operation in
TV application.
HSIP012-P-0000A
• TV
■ Block Diagram
Volume
12
Out1
11
NF1
10
VCC
GND
8
NF2
7
Out2
6
RF
5
In2
4
VAO2
3
Vol.
2
In1
VAO1
1
Ripple
filter
9
Over
current
thermal
protection
circuit
1
AN5272
ICs for Audio Common Use
■ Pin Descriptions
Pin No.
Description
Pin No.
Description
1
Variable audio output 1
7
Ch.2 output
2
Ch.1 input
8
Negative feedback ch.2
3
Volume control
9
GND
4
Variable audio output 2
10
VCC
5
Ch.2 input
11
Negative feedback ch.1
6
Ripple filter
12
Ch.1 output
■ Absolute Maximum Ratings
Parameter
Symbol
Rating
Unit
VCC
30
V
ICC
3.5
A
PD
37.5
W
Topr
−25 to +75
°C
Tstg
−55 to +150
°C
Supply voltage
Supply current
Power dissipation
*2
Operating ambient temperature
Storage temperature
*1
*1
Note) *1 : Ta = 25 °C except power dissipation, operating ambient temperature and storage temperature.
*2 : Power dissipation of the package at Ta = 75 °C.
■ Recommended Operating Range
Parameter
Supply voltage
Symbol
Range
Unit
VCC
12.2 to 27.5
V
■ Electrical Characteristics at VCC = 18 V, f = 1 kHz, RL = 8 Ω, Ta = 25 °C
Parameter
Symbol
Quiescent current
Voltage gain
Total harmonic distortion
Output power
*1
*1
Channel balance
Max. volume attenuation
VAO voltage gain
Output noise voltage
*1
*1
Conditions
Typ
Max
Unit
ICQ
No input signal
17
25
33
mA
GV
VIN = 90 mV
28
30
32
dB
THD
VIN = 90 mV
0.3
1.0
%
PO
THD = 10 %
3.6
4.1
CB
VIN = 90 mV
−1
0
1
dB
Att
VIN = 90 mV
−70
−64
dB
GVAO
VIN = 90 mV
12
14
dB
VNO
Rg = 10 kΩ, Din-Audio Filter
0.6
1.0 mV[rms]
Note) *1 : With a filter band from 20 Hz to 20 kHz used.
2
Min
10
W
ICs for Audio Common Use
AN5272
■ Application Circuit Example
1 µF
1 µF
10 kΩ
Variable audio
output 1
100 µF
1000 µF
0.047
µF
10 µF
RL = 8 Ω
20 Ω
1 kΩ
Variable audio
output 2
NF1 11
Out1 12
20 kΩ
VCC 10
NF2 8
RF 6
In2 5
1 µF
GND 9
5V
Out2 7
1 µF
VAO2 4
Vol. 3
In1 2
VAO1 1
AN5272
20 kΩ
10 µF
1000 µF
1 kΩ
0.047
µF
20 Ω
1000 µF
RL = 8 Ω
18 V
■ Usage Notes
1) Depending on the maximum application output power, external heatsink may be needed.
External heatsink should be fixed to the chassis.
2) Fin of the IC can be connected to GND.
3) Please prevent output to VCC short and output to GND short.
4) The temperature protection circuit will operate at Tj around 150 °C. However, if the temperature decreases, the
protection circuit would automatically be deactivated and resume normal operation.
3
AN5272
ICs for Audio Common Use
■ Technical Information
1.Characteristic Curve Chart
PO, THD  VIN
30
10
THD
0.1
1
0.01
1
10
Voltage gain GV (dB)
PO
1
26
VCC = 18 V
RL = 8 Ω
VIN = 90 mV
Vol. = max.
24
22
1.0
0.8
0.6
0.4
THD
0.2
0.1
1000
100
GV
28
10
100
1k
0
100k
10k
Input voltage VIN (mV)
Frequency f (Hz)
GVAO  f
PO  VCC
10
14
f = 1 kHz
THD = 10 %
Vol. = max.
GV
12
Output power PO (W)
Voltage gain GVAO (dB)
8
10
8
VCC = 18 V
RL = 8 Ω
VIN = 90 mV
Vol. = max.
6
4
RL = 8 Ω
6
RL = 16 Ω
4
2
2
0
10
1k
10k
14
12
16
18
20
22
Frequency (Hz)
Supply voltage VCC (V)
DC volume characteristics
PD  T a
62.5 7
60
許容損失 PD (W)
−20
−30
−40
−50
24
26
28
Rth( j−c) = 2 °C/W
Rth( 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
50
−10
41.7 6
40
31.3 5
30
4
25
20 3
17.9
10.4 2
10
−60
1
3.0
0
−70
0
1
2
3
DC volume (V)
4
0
10
100k
VCC = 18 V
RL = 8 Ω
VIN = 90 mV
f = 1 kHz
0
Volume attenuation (dB)
100
4
5
0
25
50
75
100
周囲温度 Ta (°C)
125
150
Total harmonic distortion THD (%)
100
VCC = 18 V
RL = 8 Ω
f = 1 kHz
Vol. = max.
Total harmonic distortion THD (%)
Output power PO (W)
10
GV, THD  f
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 :
Pin7,12
GVI
GV input = 4 dB
which is fixed in
internal circuit.
R1 is always fixed at 20 kΩ.
R2 is variable.
GVO = 20 log (R1/R2)
Pin8
11
R1
Typical values are : R1 = 20 kΩ, R2 = 1 kΩ
CNF = 10 µF
GVO = 20 log (20 k/1 k)
= 26 dB
R2
GVTOTAL = GVI + GVO
= 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 :
Volume
attenuation
AN5272
Microcomputer IC
300 Ω 3
Volume
control
R4
18 kΩ
R5
12 kΩ
PWM
output
C4
2.2 µF
0
Fig. Volume control interface circuit for AN5272
0.6
5 (V)
Volume at Pin3
Fig. Volume characteristic of AN5272
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.
1000 µF
Pin7
12
C
0.047 µF
R
20 Ω
RL = 8 Ω
5
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 VO, during power turn ON and OFF are shown below :
VO
CRF
33 µF
Pin7
&
Pin12
VCC 10
RF 6
VCC
CVCC
47 µF
CRF = 100 µF
Turn ON
time
Turn OFF
time
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.
DC voltage
5V
RF 6
1/2VCC
Stand-by
0V
6
ON
OFF
(Pin7 & Pin12)
VO (DC)
100 µF
5V
5V
Stand-by
Time