Dual 3.1 W Audio Power Amplifier s Overview. The AN7124 is a monolithic integrated circuit designed for dual audio power amplifier of portable radio cassette.
AN7124 Dual 3.1 W Audio Power Amplifier ■ Overview
Unit : mm
The AN7124 is a monolithic integrated circuit designed for dual audio power amplifier of portable radio cassette.
(1.3)
12
7.7±0.3
(10.0)
29.6±0.3
(1.27) +0.15
0.6 –0.05 (1.27)
20.0±0.3
R1.8
(1.2) 19.1±0.3 21.9±0.3
3.5±0.3
1.45±0.15
1 1.2±0.1
• Radio-cassette
1.80±0.15
(12.5)
■ Applications
+0.10 0.25 –0.05 2.54
0.6
• Audio output : 3.1 W × 2 channel • Built-in standby and muting circuit • Built-in thermal shut down protection circuit • Low pop noise during standby and mute ON/OFF • No negative feedback pin
φ3.6
(10.0)
29.75±0.30 28.0±0.3
■ Features
HSIP012-P-0000A
■ Block Diagram
45 dB
45 dB
Over current thermal protection circuit
Mute
12
11
10 VCC
GND
9
8
7
5 GND
4
3
2
1
6
Ripple filter
STB
■ Pin Descriptions Pin No.
Description
Pin No.
Description
1
Stand-by
7
ch.1 output
2
Muting
8
ch.1 bootstrap
3
ch.2 input
9
Output GND
4
ch.1 input
10
VCC
5
Input GND
11
ch.2 bootstrap
6
Ripple filter
12
ch.2 output 1
AN7124
ICs for Audio Common Use
■ Absolute Maximum Ratings Parameter
Symbol
Rating
Unit
Supply voltage
VCC
24
V
Supply current
ICC
4.0
A
Power dissipation
PD
37.5
W
Operating ambient temperature
Topr
−25 to +75
°C
Storage temperature
Tstg
−55 to +150
°C
Symbol
Range
Unit
VCC
6.0 to 18.0
V
■ Recommended Operating Range Parameter Supply voltage
■ Electrical Characteristics at VCC = 12 V, RL = 3 Ω, f = 1 kHz, Ta = 25 °C Parameter
Symbol
Conditions
Typ
Max
Unit
ICQ
VIN = 0 mV
12
19
26
mA
VNO
VIN = 0 mV,PG = 10 kΩ
0.27
0.5
mVrms
GV
VIN = 3 mV
43
45
47
dB
THD
VIN = 3 mV
0.05
0.5
%
Maximum output 1
PO1
THD = 10 %
4.3
5.0
W
Channel balance
CB
VIN = 3 mV
−1
0
1
dB
RR
RG = 0 Ω,VR = 280 mVrms,fR = 120 Hz
45
50
dB
ISTB
VIN = 0 mV
1
10
µA
Mut
VIN = 10 mV
60
80
dB
PO2
THD = 10 %,VCC = 9 V
2.5
3.0
W
CT
RG = 10 kΩ,VIN = 10 mV,f = 1 kHz
50
64
dB
Quiescent current Output noise voltage
*1
Voltage gain Total harmonic distortion
Ripple rejection
*1
Standby current Muting effects
*1
Maximum output 2 Crosstalk
*1,*3
*3
*2
Note) *1 : With a filter band from 20 Hz to 20 kHz (12 dB/OCT) used. *2 : With a filter band from 400 Hz to 30 kHz used. *3 : Reference data for design.
2
Min
ICs for Audio Common Use
AN7124
1 µF 22 µF
33 µF
3.9 kΩ
1 000 µF
2.2 Ω
RL 3
Mute
12
11
10
1 000 µF 2.2 Ω
5 V(On)
STB
47 µF
47 µF 47 nF
VIN1
9
8
7
6
1 µF 100 µF
8.2 kΩ
(Off)5 V (On)0 V
VIN2
5
4
3
2
1
■ Application Circuit Example
47 nF
1 000 µF
RL 3
VCC = 9 V/12 V
0 V(Off)
■ Characteristics Curve PD Ta 70 62.5 W
Power dissipation PD (W)
60
50 (1) 40
30 20.8 W
(2)
20 15.6 W
(3)
10 3.0 W
(4)
0 0
40
80
120
160
Ambient temperature Ta (°C)
1. TC = Ta (θj-c = 2 °C/W) 2. 20.83 W (θf = 4.0 °C/W) With a 100 cm2 × 3 mm Al heat sink (black colour coated) or a 200 cm 2 × 2 mm Al heat sink (not lacquered) 3. 15.63 W (θf = 6.0 °C/W) With a 100 cm2 × 2 mm Al heat sink(not lacquered) 4. 3.0 W at Ta = 25 °C (θj-a = 42 °C/W) Without heat sink
3
AN7124
ICs for Audio Common Use
■ Application Note 1.Voltage gain The close loop gain of AN7124 is fixed at 45 dB(typ.)
GV = 20 log(
R1 84 Ω
R2
R1 R2
)
15 kΩ
2.Standby function Standby is ON when Pin1 is set to "L". By applying a 5 V to the standby pin, transistor Q1 will be turned ON to provide a constant current (I) for driving other parts of the circuit. The RC is to create a TIME CONSTANT for the standby pulse during charging and discharging.
Features. ⢠Access time 250/350/450ns (max.) ⢠Single +5V ±1 0% power supply. ⢠TT L compatible inputs and outputs. ⢠Three-state outputs. General Description.
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