ICs for Audio Common Use
AN7124
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.
(10.0)
7.7±0.3
Unit : mm
12
φ3.6
+0.10 0.25 –0.05 2.54
(12.5)
(1.2) 19.1±0.3 21.9±0.3
HSIP012-P-0000A
s Block Diagram
45 dB
45 dB
Mute STB Ripple filter
Over current thermal protection circuit
10
11
GND
GND
s Pin Descriptions
Pin No. 1 2 3 4 5 6 Stand-by Muting ch.2 input ch.1 input Input GND Ripple filter Description Pin No. 7 8 9 10 11 12 ch.1 output ch.1 bootstrap Output GND VCC ch.2 bootstrap ch.2 output 1 Description
VCC
12
1
2
3
4
5
6
7
8
9
1.80±0.15
• Radio-cassette
1.2±0.1
3.5±0.3
s Applications
1.45±0.15
• 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
29.75±0.30 28.0±0.3
20.0±0.3
(1.27)
s Features
(1.3)
R1.8
0.6
1
0.6 –0.05 (1.27)
(10.0)
+0.15
29.6±0.3
AN7124
s Absolute Maximum Ratings
Parameter Supply voltage Supply current Power dissipation Operating ambient temperature Storage temperature Symbol VCC ICC PD Topr Tstg
ICs for Audio Common Use
Rating 24 4.0 37.5 −25 to +75 −55 to +150
Unit V A W °C °C
s Recommended Operating Range
Parameter Supply voltage Symbol VCC Range 6.0 to 18.0 Unit V
s Electrical Characteristics at VCC = 12 V, RL = 3 Ω, f = 1 kHz, Ta = 25 °C
Parameter Quiescent current Output noise voltage Voltage gain Total harmonic distortion Maximum output 1 Channel balance Ripple rejection Standby current Muting effects
*1 *3 *1 *2 *1
Symbol ICQ VNO GV THD PO1 CB RR ISTB Mut PO2 CT VIN = 0 mV
Conditions VIN = 0 mV,PG = 10 kΩ VIN = 3 mV VIN = 3 mV THD = 10 % VIN = 3 mV RG = 0 Ω,VR = 280 mVrms,fR = 120 Hz VIN = 0 mV VIN = 10 mV THD = 10 %,VCC = 9 V RG = 10 kΩ,VIN = 10 mV,f = 1 kHz
Min 12 43 4.3 −1 45 60 2.5 50
Typ 19 0.27 45 0.05 5.0 0 50 1 80 3.0 64
Max 26 0.5 47 0.5 1 10
Unit mA mVrms dB % W dB dB µA dB W dB
Maximum output 2 Crosstalk
*1,*3
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
ICs for Audio Common Use
s Application Circuit Example
AN7124
10
11
1 µF 22 µF 3.9 kΩ (Off)5 V 33 µF 8.2 kΩ
1 µF 100 µF 47 nF 2.2 Ω RL 3
47 µF 1 000 µF 1 000 µF 2.2 Ω VCC = 9 V/12 V
47 µF 47 nF RL 3 1 000 µF
VIN2
VIN1
5 V(On)
STB
(On)0 V
Mute
0 V(Off)
s Characteristics Curve
PD Ta
70 62.5 W 60
Power dissipation PD (W)
50 (1) 40
30 20.8 W 20 15.6 W 10 3.0 W 0 0 40 80 120 160 (4)
(2)
(3)
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 m m 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
12
1
2
3
4
5
6
7
8
9
3
AN7124
s Application Note
1.Voltage gain The close loop gain of AN7124 is fixed at 45 dB(typ.)
ICs for Audio Common Use
R1 R2 84 Ω 15 kΩ
GV = 20 log(
R1 R2
)
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.
ZSTBY 1 C On Q1 I VCC
Off
5V
R Stb
Threshold voltage (at Pin1) : ON
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