STMICROELECTRONICS TDA7240AH

TDA7240A
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20W BRIDGE AMPLIFIER FOR CAR RADIO
COMPACT HEPTAWATT PACKAGE
FEW EXTERNAL COMPONENTS
OUTPUT PROTECTED AGAINST SHORT
CIRCUITS TO GROUND AND ACROSS LOAD
DUMP TRANSIENT
THERMAL SHUTDOWN
LOUDSPEAKER PROTECTION
HIGH CURRENT CAPABILITY
LOW DISTORTION/LOW NOISE
Heptawatt H
Heptawatt V
ORDERING NUMBERS:
TDA7240AH
DESCRIPTION
The TDA7240A is a 20W bridge audio amplifier IC
designed specially for car radio applications.
Thanks to the low external part count and compact
Heptawatt 7-pin power package the TDA7240A
occupies little space on the printed circuit board.
TDA7240AV
Reliable operation is guaranteed by a comprehensive array of on-chip protection features. These include protection against AC and DC output short
circuits (to ground and across the load), load dump
transients, and junction overtemperature. Additionally, theTDA7240Aprotectstheloudspeakerwhen
one output is short-circuited to ground.
Figure 1: Test and Application Circuit
December 1998
1/8
TDA7240A
PIN CONNECTION (Top view)
ABSOLUTE MAXIMUM RATINGS
Symbol
Value
Unit
Vs
Operating Supply Voltage
Parameter
18
V
Vs
DC Supply Voltage
28
V
Vs
Peak Supply Voltage (for 50ms)
40
V
Io (*)
Peak Output Current (non repetitive t = 0.1ms)
4.5
A
Io (*)
Peak Output Current (repetitive f ≥10Hz)
3.5
A
Ptot
Power Dissipation at Tcase = 85°C
16
W
Tstg, Tj
Storage and Junction Temperature
–40 to 150
°C
Value
Unit
4
V
(*) Internally limited
THERMAL DATA
Symbol
Rth j-case
2/8
Parameter
Thermal Resistance Junction-case
Max.
TDA7240A
ELECTRICAL CHARACTERISTICS (refer to the circuit of fig. 1, T amb = 25°C, Rth (heatsink) = 4°C/W,
Vs = 14.4V)
Symbol
Parameter
Vs
Supply Voltage
Vos
Output Offset Voltage
Test Conditions
Min.
65
Id
Total Quiescent Current
RL = 4Ω
Po
Output Power
f = 1kHz; d = 10%
R L = 4Ω
R L = 8Ω
d
Distortion
18
10
Max.
Unit
18
V
150
mV
120
mA
20
12
W
W
RL = 4Ω
Po = 50mW to 12W
f = 1kHz
0.1
0.5
%
RL = 8Ω
Po = 50mW to 12W
f = 1kHz
0.05
0.5
%
39.5
40
40.5
35
40
GV
Voltage Gain
f = 1KHz
SVR
Supply Voltage Rejection
f = 100Hz
Total Input Noise
Rg = 10KΩ
EN
Typ.
R g = 10KΩ
2
3
(*)
(**)
η
Efficiency
Isb
Stand-by Current
Ri
Input Resistance
f = 1kHz
Vi
Input Sensitivity
f = 1kHz; Po = 2W; RL = 4Ω
fL
Low Frequency Roll Off
(–3dB)
Po = 15W;
RL = 4Ω
fH
High Frequency Roll Off
(–3dB)
Po = 15W;
RL = 4Ω
As
Stand-by Attenuation
Vo = 2Vrms
RL = 4Ω
µA
70
kΩ
28
mV
30
25
70
µV
µV
%
200
Hz
kHz
90
VTH (pin2) Stand-by Threshold
(*) B= Curve A
10
65
f = 1KHz
dB
dB
dB
1
V
(**) B = 22Hz to 22 KHz
Figure 2 : P.C. Board and Components layout of the Circuit of Fig. 1.(1:1scale)
3/8
TDA7240A
APPLICATION SUGGESTION
The recommendedvalues of the componentsare thoseshown on applicationcircuit of Fig. 1. Different values
can be used, the following table can help the designer.
Component
Recommended
Value
R1, R2
2.2Ω
Frequency Stability
Danger of High
Frequency Oscillation
C1
1µF
Input DC Decoupling
Higher Turn On and
Stand-by Delay
Higher Turn On Pop.
Higher Low
Frequency Cutoff
C2
22µF
Ripple Rejection
Increase of SVR
Increase of the Turn
On Delay
Degradation of SVR
C3
22µF
Feedback low
Frequency Cutoff
Higher Low Frequency
Cutoff
C6, C7
0.22µF
Frequency Stability
Danger of Oscillation
C4
220µF
Supply Filter
Danger of Oscillation
0.1µF
Supply Bypass
Danger of Oscillation
C5
Purpose
Larger Than
Smaller Than
Figure 3 : Output Power vs. Supply Voltage.
Figure 4 : Distortion vs. Output Power.
Figure 5 : Output Power vs. Supply voltage.
Figure 6 : Distortion vs. Output Power.
4/8
TDA7240A
Figure 7 : Distortion vs. Frequency.
Figure 8 : Supply Voltage Rejection
vs. Frequency.
Figure 9 : Power Dissipation and Efficiency vs.
Output Power.
Figure 10 : Power Dissipation and Efficiency vs.
Output Power.
5/8
TDA7240A
DIM.
A
C
D
D1
E
E1
F
F1
G
G1
G2
H2
H3
L
L1
L2
L3
L4
L5
L6
L7
L9
M
M1
V4
Dia
MIN.
mm
TYP.
2.4
1.2
0.35
0.7
0.6
2.34
4.88
7.42
10.05
16.7
21.24
22.27
2.6
15.1
6
2.55
4.83
2.54
5.08
7.62
16.9
14.92
21.54
22.52
2.8
15.5
6.35
0.2
2.8
5.08
3.65
MAX.
4.8
1.37
2.8
1.35
0.55
0.97
0.8
0.9
2.74
5.28
7.82
10.4
10.4
17.1
inch
TYP.
MIN.
0.094
0.047
0.014
0.028
0.024
0.095
0.193
0.295
0.396
0.657
21.84
22.77
1.29
3
15.8
6.6
0.386
0.877
0.102
0.594
0.236
3.05
5.33
40°
3.85
0.100
0.190
(typ.)
0.144
0.100
0.200
0.300
0.668
0.587
0.848
0.891
0.110
0.610
0.250
0.008
0.110
0.200
OUTLINE AND
MECHANICAL DATA
MAX.
0.189
0.054
0.110
0.053
0.022
0.038
0.031
0.035
0.105
0.205
0.307
0.409
0.409
0.673
0.860
0.896
0.051
0.118
0.622
0.260
0.120
0.210
Heptawatt V
0.152
V
L
V
E
L1
M1
A
M
D
C
D1
L5
H2
L2
L3
F
E
E1
V4
L9
H3
H1
G
G1
G2
Dia.
F
L7
L4
L6
6/8
H2
F1
HEPTAMEC
TDA7240A
DIM.
mm
MIN.
TYP.
inch
MAX.
A
4.8
C
1.37
D
MIN.
TYP.
MAX.
0.189
0.054
2.4
2.8
0.094
0.110
D1
1.2
1.35
0.047
0.053
E
0.35
0.55
0.014
0.022
F
0.6
0.8
0.024
0.031
F1
G
2.41
2.54
0.9
2.67
0.095
0.100
0.035
0.105
G1
4.91
5.08
5.21
0.193
0.200
0.205
G2
7.49
7.62
7.8
0.295
0.300
0.307
H2
H3
10.4
10.05
L
10.4
0.409
0.396
0.409
14.2
0.559
L1
4.4
0.173
L2
15.8
0.622
L3
5.1
0.201
L5
2.6
3
0.102
0.118
L6
15.1
15.8
0.594
0.622
L7
6
6.6
0.236
0.260
3.85
0.144
L9
Dia
4.44
3.65
OUTLINE AND
MECHANICAL DATA
Heptawatt H
0.175
0.152
7/8
TDA7240A
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this
publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written
approval of STMicroelectronics.
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HEPTAWATT is a Trademark of SGS-THOMSON Microelectronics
 1998 STMicroelectronics – Printed in Italy – All Rights Reserved
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