AN7148

AN7148, Serwisówki TV, Układy Scalone

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ICs for Audio Common Use
AN7148
Dual 2.1W Audio Power Amplifier Circuit
Overview
The AN7148 is an integrated circuit designed for power
amplifier of 2.1W (9V, 4
Unit : mm
) output. Stereo operation is
enabled due to incorporating two amplifiers on one chip.
It is most suitably used for battery operated set such as
radio cassette recorder because quiescent circuit current
is small comparing to current power amplifier. Low distor-
tion and low noise are realized and external components
are very few. 12-pin SIL package has realized compact
and high density mounting of a set.
½
ø 3.6
5.9±0.25 7.7±0.3 7.8±0.25
12
Features
•
Low quiescent current
•
High operation stability
•
Low radiation
•
Low distortion
•
Low noise
•
Low shock noise from power ON/OFF operation
•
Fewer external components
1
12-Lead SIP Package with Fin (HSIP012-P-0000A)
n
Pin Descriptions
Pin No.
Pin Name
Pin No.
Pin Name
1
2
3
4
5
6
N.F.B Ch.1
Input Ch.1
Ripple Filter
GND (Input)
Input Ch.2
N.F.B Ch.2
7
8
9
10
11
12
Output Ch.2
Bootstrap Ch.2
GND (Output)
V
CC
Bootstrap Ch.1
Output Ch.1
n
Block Diagram
1
11
2
Inp
u
t
Circuit
Dri
v
er
Circuit
Out
p
ut
Circuit
12
Ch.1
3
Over Temperature
Protection
10
V
CC
Ch.2
5
Inp
u
t
Circuit
Dri
v
er
Circuit
Out
p
ut
Circuit
7
6
4
9
8
GND (Input)
GND (Output)
n
n
AN7148
ICs for Audio Common Use
n
Absolute Maximum Ratings
(Ta= 25˚C)
Parameter
Symbol
Rating
Unit
Supply Voltage
Supply Current
Power Dissipation
Operating Ambient Temperature
Storage Temperature
V
CC
I
CC
P
D
*
T
opr
T
stg
24
3.5
41.7
– 30 ~ + 75
– 55 ~ + 150
V
A
W
˚C
˚C
*
R
q j – c
= 3˚C/W
n
Electrical Characteristics
(Ta
= 25˚C)
Parameter
Symbol
Condition
min.
typ.
max.
Unit
Quiescent Circuit Current
I
CQ
V
CC
= 9V, R
L
= 4½ , V
in
= 0mV
13
19
mA
Output Noise Voltage
V
no
*
V
CC
= 9V, R
L
= 4½ , V
in
= 0mV,
R
g
= 10k½
0.25
0.50
mV
Voltage Gain (Gain)
G
V
V
CC
= 9V, R
L
= 4½ , V
in
= 3mV,
f
= 1kHz
V
CC
= 9V, R
L
= 4½ , V
in
= 3mV,
f
= 1kHz
V
CC
= 9V, R
L
= 4½ ,
THD
= 10%, f
= 1kHz
V
CC
= 9V, R
L
= 4½ , V
in
= 3mV,
f
= 1kHz
V
CC
= 9V, R
L
= 8
42.5
44.5
46.5
dB
Total Harmonic Distortion
THD
0.20
0.75
%
Maximum Output Power (4½ )
P
O (max.)
1.75
2.10
W
Channel Balance
CB
0
1
dB
Maximum Output Power (8½ )
P
O (max.) 8
,
THD
= 10%, f
= 1kHz
V
CC
= 9V, R
L
= 3½ ,
THD
= 10%, f
= 1kHz
1.25
W
Maximum Output Power (3½ )
P
O (max.) 3
2.6
W
Note) Operating Supply Voltage Range : V
CC (opr.)
= 6 ~ 18V
*
Filter with band width of 15Hz ~ 30kHz (12dB/oct) should be used for V
no
measurement.
P
D
– Ta
50
(1) Tc = Ta (q
j– c
= 3˚C/W)
(2) With a 100cm
2
´ 3mm Al
heat sink (black
c
olor coated)
or a 200cm
2
45
41.7W
´ 2mm Al heat
sink (not lacquered)
(3) With a 100cm
2
40
´ 2mm Al
heat sink (not lacquered)
(4) Without heat sink
35
(1)
30
25
20
17.9W
(2)
15
13.9W
10
(3)
5
0
3.0W
(4)
0
25
50
75
100 125
150
Ambient Temperature Ta (˚C)
½
ICs for Audio Common Use
AN7148
G
V
, I
CQ
, THD – V
CC
P
O
, THD – V
in
G
V
, THD – f
46
10
100
G
V
V
CC
=
9V
R
L
= 4½
f = 1kHz
45
45
G
V
f = 1kHz
R
L
= 4½
44
44
1
10
43
0.1
42
THD
0.8
1
41
1.0
15
0.6
0.8
I
CQ
P
O
0.6
10
0.4
0.01
0.1
0.4
THD
V
CC
= 9V
R
L
= 4½
V
in
= 3mV
5
0.2
THD
0.2
0
0
0
4
8
12
16
20
24
0
0.001
0.1
1
10
100
0.01
10
100
1k
10k
100k
Supply Voltage V
CC
(V)
Input Voltage V
in
(mV)
Frequency f (Hz)
P
O
– V
CC
V
no
– R
g
20
1.6
V
CC
= 9V
R
L
= 4½
18
THD = 10%
f = 1kHz
1.4
16
14
1.2
12
1.0
10
R
L
= 3
½
0.8
8
0.6
6
4
FLAT
R
L
= 4½
0.4
DIN/Audio
0.2
2
0
0
4
8
12
16
20
24
0.1k
1k
10k
100k
1000k
Supply Voltage V
CC
(V)
Input Resistance R
g
(
½
)
n
Application Circuit
V
CC
–
+
+
1000µF
1000µF
–
3
10
0.1µF
+
1
11
+
100
µ
F
2.2½
–
–
47µF
1000µF
2
12
Input Ch.1
+ –
AN7148
5
7
+ –
Input Ch.2
47µF
–
+
1000µF
6
8
0.1
µ
F
+
100µF
4
9
–
2.2
½
0
AN7148
ICs for Audio Common Use
n
Printed Circuit Board Layout
AN7148
Output2
–
1000µF
Input2
–
1000µF
Output1
0
.1
µ
F
+
+
100µF
–
GND
–
–
100µF
+ –
V
CC
100µF
+
+
–
+
+
1000
µ
F
47µF
Input1
47
µ
F
–
1
12
GND
+
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