TDA7240ADecember 199820W BRIDGE AMP

TDA7240A
December 1998
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
DESCRIPTION
Heptawatt H Heptawatt V
ORDERING NUMBERS:
TDA7240AH TDA7240AV
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.
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,
the TDA7240A protects the loudspeaker when
one output is short-circuited to ground.
Figure 1: Test and Application Circuit
®
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ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
Vs Operating Supply Voltage 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 ³10Hz) 3.5 A
Ptot Power Dissipation at Tcase = 85°C 16 W
Tstg, Tj Storage and Junction Temperature –40 to 150 °C
(*) Internally limited
PIN CONNECTION (Top view)
THERMAL DATA
Symbol Parameter Value Unit
Rth j-case Thermal Resistance Junction-case Max. 4 V
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ELECTRICAL CHARACTERISTICS (refer to the circuit of fig. 1, Tamb = 25°C, Rth (heatsink) = 4°C/W,
Vs = 14.4V)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
Vs Supply Voltage 18 V
Vos Output Offset Voltage 150 mV
Id Total Quiescent Current RL = 4W 65 120 mA
Po Output Power f = 1kHz; d = 10%
RL = 4W
RL = 8W
18
10
20
12
W
W
d Distortion RL = 4W f = 1kHz
Po = 50mW to 12W
0.1 0.5 %
RL = 8W f = 1kHz
Po = 50mW to 12W
0.05 0.5 %
GV Voltage Gain f = 1KHz 39.5 40 40.5 dB
SVR Supply Voltage Rejection f = 100Hz Rg = 10KW 35 40 dB
EN Total Input Noise Rg = 10KW
(*)
(**)
2
3 10
mV
mV
h Efficiency RL = 4W f = 1KHz 65 %
Isb Stand-by Current 200 mA
Ri Input Resistance f = 1kHz 70 kW
Vi Input Sensitivity f = 1kHz; Po = 2W; RL = 4W 28 mV
fL Low Frequency Roll Off
(–3dB)
Po = 15W; RL = 4W 30 Hz
fH High Frequency Roll Off
(–3dB)
Po = 15W; RL = 4W 25 kHz
As Stand-by Attenuation Vo = 2Vrms 70 90 dB
VTH (pin2) Stand-by Threshold 1 V
(*) B= Curve A (**) B = 22Hz to 22 KHz
Figure 2 : P.C. Board and Components layout of the Circuit of Fig. 1.(1:1scale)
TDA7240A
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APPLICATION SUGGESTION
The recommended values of the components are those shown on application circuit of Fig. 1. Different values
can be used, the following table can help the designer.
Component Recommended
Value
Purpose Larger Than Smaller Than
R1, R2 2.2W Frequency Stability Danger of High
Frequency Oscillation
C1 1mF Input DC Decoupling Higher Turn On and
Stand-by Delay
Higher Turn On Pop.
Higher Low
Frequency Cutoff
C2 22mF Ripple Rejection Increase of SVR
Increase of the Turn
On Delay
Degradation of SVR
C3 22mF Feedback low
Frequency Cutoff
Higher Low Frequency
Cutoff
C6, C7 0.22mF Frequency Stability Danger of Oscillation
C4 220mF Supply Filter Danger of Oscillation
C5 0.1mF Supply Bypass Danger of Oscillation
Figure 4 : Distortion v Figure 3 : Output Power vs. Supply Voltage. s. Output Power.
Figure 5 : Output Power vs. Supply voltage. Figure 6 : Distortion vs. Output Power.
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Figure 8 : Supply Voltage Rejection
vs. Frequency.
Figure 7 : Distortion vs. Frequency.
Figure 10 : Power Dissipation and Efficiency vs.
Output Power.
Figure 9 : Power Dissipation and Efficiency vs.
Output Power.
TDA7240A
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Heptawatt V
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 4.8 0.189
C 1.37 0.054
D 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
E1 0.7 0.97 0.028 0.038
F 0.6 0.8 0.024 0.031
F1 0.9 0.035
G 2.34 2.54 2.74 0.095 0.100 0.105
G1 4.88 5.08 5.28 0.193 0.200 0.205
G2 7.42 7.62 7.82 0.295 0.300 0.307
H2 10.4 0.409
H3 10.05 10.4 0.396 0.409
L 16.7 16.9 17.1 0.657 0.668 0.673
L1 14.92 0.587
L2 21.24 21.54 21.84 0.386 0.848 0.860
L3 22.27 22.52 22.77 0.877 0.891 0.896
L4 1.29 0.051
L5 2.6 2.8 3 0.102 0.110 0.118
L6 15.1 15.5 15.8 0.594 0.610 0.622
L7 6 6.35 6.6 0.236 0.250 0.260
L9 0.2 0.008
M 2.55 2.8 3.05 0.100 0.110 0.120
M1 4.83 5.08 5.33 0.190 0.200 0.210
V4 40° (typ.)
Dia 3.65 3.85 0.144 0.152
A
L
L1
C
D1
L5
L2
L3
D
E
M1
M
H3
Dia.
L7
L6
H2 F1
F
G G1 G2
E1
F
E
L9
V4
L4
H2
V V
HEPTAMEC
H1
OUTLINE AND
MECHANICAL DATA
TDA7240A
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Heptawatt H
DIM.
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 4.8 0.189
C 1.37 0.054
D 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 0.9 0.035
G 2.41 2.54 2.67 0.095 0.100 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 10.4 0.409
H3 10.05 10.4 0.396 0.409
L 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
L9 4.44 0.175
Dia 3.65 3.85 0.144 0.152
OUTLINE AND
MECHANICAL DATA
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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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HEPTAWATTÔ is a Trademark of SGS-THOMSON Microelectronics
© 1998 STMicroelectronics – Printed in Italy – All Rights Reserved
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