ICs for Audio Common Use
1
AN5270
4.3 W
1(8
) Power Amplifier with Volume Control and Tone Control
s
Overview
The AN5720 is an integrated circuit designed for 4.3 W(8
) power amplifier with volume control and tone control.
s
Features
DC volume control : 0 to 5 V
DC tone control : 0 to 5 V
9-lead single-in-line plastic package with fin
s
Block Diagram
s
Pin Descriptions
HSIP009-P-0000
Unit : mm
Pin No.
Pin Name
1
V
CC1
2
Sound input
3
Low frequency input
4
Volume control
5
Tone control
6
Ripple filter
7
Ground
8
Sound output
9
V
CC2
Note) Pins 2 and 4 are weaker in protection against positive surge than the other pins.
It is necessary to pay attention during application use.
V
CC1
1
In
2
LF
3
V
ol-ctl.
4
T
one-ctl.
5
RF
6
GND
7
Out
8
V
CC2
9
Pre
amp.
Volume
control
Tone
control
9
8
7
6
5
4
3
2
1
3.3
0.1
0.1
0.05
5.6
0.25
0.25
1.7
1.7
0.25
0.45
+0.1 0.05
2.65
0.1
8.4
0.25
6.3
7.1
3.75
0.25
0.5
0.1
1.2
0.25
2.54
15.0
19.9
0.1
18.3
0.25
5.8
0.25
1.5
0.25
0.3
0.25
22.3
0.3
2
AN5270
ICs for Audio Common Use
s
Absolute Maximum Ratings
Parameter
Symbol
Ratings
Unit
Supply voltage
V
CC1
(V
1-7
)
14
V
V
CC2
(V
9-7
)
26
Circuit voltage
V
2-7
0 to V
9-7
V
3-7
0 to V
9-7
V
4-7
0 to V
1-7
V
5-7
0 to V
1-7
Supply current
I
CC1
15
mA
I
CC2
2
A
Circuit current
*3, 4
I
8
-
1.7 to
+
1.7
A
PP
Power dissipation
*2
P
D
1.6
W
Operating ambient temperature
*1
T
opr
-
20 to
+
70
C
Storage temperature
*1
T
stg
-
55 to
+
150
C
s
Recommended Operating Range
Parameter
Symbol
Range
Unit
Operating supply voltage range
V
CC1
11 to 13
V
V
CC2
15 to 24
Note) Do not apply a current or voltage from the external to the terminals that are not described above.
*1 : T
a
=
25
C, excluding parameters regarding ambient temperature and storage temperature.
*2 : T
a
=
70
C, the IC is mounted on PCB, without external heat sink.
*3 : For circuit currents, '
+
' denotes current flowing into the IC, and '
-
' denotes current flowing out of the IC.
*4 : As the output Pin8 does not have over current protection circuit incorporated,
therefore please take precaution not to short the output pin to either V
CC
or GND.
3
ICs for Audio Common Use
AN5270
s
Electrical Caracteristics at V
CC1
=
12 V, V
CC2
=
18 V, f
=
1 kHz, T
a
=
25
C, RL
=
8
, Vol.
=
max.,
Tone
=
max.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Quiescent current 1
I
TOT1
No input signal
7
10
13
mA
Measure V
CC1
current
Quiescent current 2
I
TOT2
No input signal
20
28
48
mA
Measure V
CC2
current
Output DC bias
V
ODC
No input signal
7.2
8.3
9.4
V
Measure Pin8 DC
Voltage gain
G
V
V
O
=
1 V
rms
, G
V
=
20 log(V
O
/ V
IN
)
28
30
32
dB
Total harmonic distortion
THD
V
O
=
1 V
rms
, BPF : 400 Hz to 30 kHz
0.5
1.0
%
Max. output power
Pomax
THD
=
10 %, P
O
=
V
O
2
/ R
L
4.0
4.3
W
Max. output attenuation
Attmax
V
O
=
1.0 V
rms
, Vol.
=
max.
min.
-
69
-
66
dB
Attmax
=
20 log [V
O(vol.
=
max.)
/ V
O(vol.
=
min.)
]
Tone variable range
G
TC
f
=
10 kHz, fix V
IN
where
18
20
dB
V
O(tone
=
max.)
=
1 V
rms
Tone
=
max.
min.
G
TC
=
20 log [V
O(tone
=
max.)
/ V
O(tone
=
min.)
]
s
Application Circuit Example
V
CC1
1
In
2
LF
3
V
ol-ctl.
4
T
one-ctl.
5
RF
6
GND
7
Out
8
V
CC2
9
5.1k
AN5270
AN78M12
8
GND
10k
VR
33k
24k
AV
SW
100
External
audio in
3.3
F
33
F
33
F
Ext
TV
0.039
F
470
F
47
F
100
F
22
F
2200
F
47
F
12V
5V
AN78M05
SIF-IC
33
F
100k
9k
30k
10k
VR
1k
33
F
Det.
out
18V
Power
supply
Note) Design considerations for shock noise prevention. :
In the application of the IC, please adopt the above power supply configuration whenever possible.
Where this is not possible, then it is better to ensure that V
CC1
should start up first before the onset of V
CC2
, in order to prevent
power-on shock noise. Similarly, please ensure that V
CC2
declines faster than V
CC1
, in order to prevent power-off shock noise.
4
AN5270
ICs for Audio Common Use
s
Technical Information
Characteristic curve chart
P
D
T
a
Area of safe operation
Structure of pre-amp. stage
Explanation of gain notations :
G
T
: Gain of tone-amp. (treble-amp.)
G
F
: Gain of flat-response amp.
G
B
: Gain of bass-amp.
G
L1
: Gain at point 1 with respect to V
IN
.
G
L2
: Gain at point 2 with respect to V
IN
.
G
P
: Gain of power stage.
G
pre
: Gain of pre-amp. stage.
Volume-control
Output
G
P
(25 dB)
G
B
V
IN
G
F
8
Tone-control
Pre-amp. stage
Fig. Simplified structure of AN5270 pre-amp. stage
G
T
Ci
33 pF
G
1 k
3
2
LF input
Input
2.8 k
2.8 k
Point2
G
L2
Point1
G
L1
5.6 k
47 k
R1
C2
C1
Power
stage
1 No heat sink
2 5.5
5.0 cm
2
Al board
(t
=
1 mm)
3 7.5
7.5 cm
2
Al board
(t
=
1 mm)
4 Infinity heat sink
0
0
1
20
160
11
4
3
1
2
Po
wer dissipation
P
D
(W
)
Ambient temperature T
a
(
C)
40
60
80 100 120 140
2
2.5
3
3.36
4
4.14
5
6
7
8
9
10
10.4
6.65
P
max
<
T
jmax
-
T
a
R
th
2.63
2.15
1.6
0.01
1
5
10
26
50
0.02
0.05
0.1
0.5
1
1.7
2
100
I
C
(A
)
V
CE
(V)
10 ms single pulse,
free air
25
C
70
C
5
ICs for Audio Common Use
AN5270
s
Technical Information (continued)
Structure of pre-amp. stage (continued)
G
F
amp., the flat-amp., amplifies the signal equally for all frequencies in the range of 20 Hz to 70 kHz.
G
T
amp., the treble or tone-amp., has an internal LPF connected to its inverting input. The non-inverting input of G
T
amp. is connected to the input signal. Thus, the output of G
T
passes only the upper range of frequencies (cut-off
frequency
=
2.5 kHz).
G
B
amp., the bass-amp., amplifies the lower range of frequencies. Its cut-off frequency is determined by R1 C1.
If LF pin is left open, then G
B
amp. has no effect on the overall frequency response.
Gain calculation
General formula for gain of pre-amp. is (when vol.
=
max., tone
=
max.) :
G
pre
=
G
L1
(G
F
+
G
T
)
-
G
B
G
L2
By vector analysis as shown in fig. Vector diagram of G
pre
,
G
V
[dB]
=
G
pre
+
G
P
G
V
[dB]
=
20 log
[G
L1
(G
F
+
G
T
)
-
G
B
G
L2
cos
]
2
+
(G
B
G
L2
sin
)
2
+
G
P
where G
L1
=
0.5
G
F
=
1.3
G
B
=
5.4
0
for (100 Hz)
G
T
=
1.3 for (1 kHz)
2.5 for (10 kHz)
G
P
=
25 dB
G
B
Z3 0.848
Z3
+
R1
Z3
=
6600
1
+
(2
f C1 6600)
2
= -
tan
-
1
(2
f C1 6600)
Note) *1 : This is the response if LF pin is open (i.e. R1 open).
G
pre
G
B
G
L2
Fig. Vector diagram of G
pre
G
L1
(G
F
+
G
T
)
G
V
*1
G1 : Gain at 100 Hz
G2 : Gain at 1 kHz
G3 : Gain at 10 kHz
f
1
: High frequency cut-off when Pin3 is open.
f
2
: Low frequency cut-off
Tone
=
max.
-
3 dB
Tone
=
min.
G1
G2
G3
Fig. Frequency response of AN5270
f
2
1 kHz
10 kHz
f
1
f
100 Hz
-
3 dB
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