PANASONIC AN5273

ICs for Audio Common Use
AN5273
4.0 W × 2 (18 V, 8 Ω) Power Amplifier with
Mute Function 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 mute circuit
• Built-in thermal protection circuit
• Built-in over current protection circuit
• 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 AN5273 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
N.C.
3
Vol.
2
In1
Mute
1
Ripple
filter
9
Over
current
thermal
protection
circuit
1
AN5273
ICs for Audio Common Use
■ Pin Descriptions
Pin No.
Description
Pin No.
Description
1
Mute control
7
Ch.2 output
2
Ch.1 input
8
Negative feedback ch.2
3
Volume control
9
GND
4
N.C.
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
Mute attenuation
*1
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
MAtt
VIN = 90 mV
−70
−64
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
W
ICs for Audio Common Use
AN5273
■ Application Circuit Example
100 kΩ
1 µF
3.3 µF
Audio
mute
5V
1 µF
10 kΩ
100 µF
20 kΩ
20 kΩ
1000 µF
0.047
µF
10 µF
RL = 8 Ω
20 Ω
1 kΩ
5V
Out1 12
NF1 11
VCC 10
GND 9
NF2 8
Out2 7
RF 6
In2 5
4
N.C.
Vol. 3
In1 2
Mute 1
AN5273
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
AN5273
ICs for Audio Common Use
■ Technical Information
1.Characteristic Curve Chart
PO, THD  VIN
30
10
THD
0.1
1
Voltage gain GV (dB)
PO
1
GV
28
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
0.01
1
10
0.1
1000
100
10
100
1k
0
100k
10k
Input voltage VIN (mV)
Frequency f (Hz)
DC volume characteristics
PO  VCC
10
VCC = 18 V
RL = 8 Ω
VIN = 90 mV
f = 1 kHz
f = 1 kHz
THD = 10 %
Vol. = max.
8
−10
Output power PO (W)
Volume attenuation (dB)
0
−20
−30
−40
RL = 8 Ω
6
RL = 16 Ω
4
−50
2
−60
−70
0
1
2
3
4
5
PD  Ta
Power dissipation PD (W)
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
41.7 6
40
31.3 5
30
4
25
20 3
17.9
10.4 2
10
1
3.0
0
0
25
50
75
100
Ambient temperature Ta (°C)
4
12
14
16
18
20
22
Supply voltage VCC (V)
DC volume (V)
62.5 7
60
0
10
125
150
24
26
28
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
AN5273
■ Technical Information (continued)
2.Application Note
1) Voltage gain
The voltage gain of the AN5273 can be varied by changing the resistor R2 as shown below :
GV input= 4 dB
which is fixed in
internal circuit.
R1 is always fixed at 20 kΩ.
Pin7,12
GVI
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
AN5273
Microcomputer IC
300 Ω 3
Volume
control
R4
18 kΩ
R5
12 kΩ
PWM
output
C4
2.2 µF
0
5 (V)
Volume at Pin3
Fig. Volume characteristic of AN5273
Fig. Volume control interface circuit for AN5273
0.6
3) Mute control
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.
Mute ON 5 V
0V
OFF
R
100 kΩ
ZMUTE
C
1.0 µF
1
Q1
The purpose of the Mute is to
attenuate the AC signal before
it goes to the output.
20 kΩ
0V
1.8 V 2.1 V
5V
Threshold voltage at Pin1 :
Mute OFF
Mute ON
5
AN5273
ICs for Audio Common Use
■ Technical Information (continued)
2.Application Note (continued)
4) 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) 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 AN5273 is determined by the capacitance value of CRF. If value of the CRF is smaller, VO
will 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 :
6
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
ICs for Audio Common Use
AN5273
■ Technical Information (continued)
2.Application Note (continued)
6) Stand-by circuit
Stand-by function can be implemented in the AN5273 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
ON
OFF
(Pin7 & Pin12)
VO (DC)
100 µF
5V
5V
Stand-by
Time
7