SGS Thomson Microelectronics TDA7240A Datasheet
20WBRIDGE AMPLIFIERFOR CAR RADIO
COMPACTHEPTAWATTPACKAGE
.
FEWEXTERNAL COMPONENTS
.
OUTPUT PROTECTEDAGAINSTSHORT
.
CIRCUITSTO GROUNDAND ACROSSLOAD
DUMP TRANSIENT
.
THERMALSHUTDOWN
.
LOUDSPEAKERPROTECTION
.
HIGHCURRENT CAPABILITY
.
LOWDISTORTION/LOWNOISE
.
TDA7240A
Heptawatt H HeptawattV
ORDERING NUMBERS:
TDA7240AH TDA7240AV
DESCRI PTION
TheTDA7240A is a 20W bridge audio amplifierIC
designed specially for car radio applications.
Thanksto the low externalpart countand compact
Heptawatt 7-pin power package the TDA7240A
occupieslittlespaceon the printedcircuitboard.
Figure 1: Te st a nd A p p lica tion Circuit
Reliableoperationis guaranteedby a comprehensive arrayof on-chipprotectionfeatures.These include protection against AC and DC output short
circuits (togroundand across theload), loaddump
transients,and junction overtemperature. Additionally,theTDA7240Aprotectstheloudspeakerwhen
oneoutputisshort-circuitedto ground.
December1998
1/8
TDA7240A
PIN CONNECTI O N (Top view)
ABSOLUTEMAXIMUMRATINGS
Symbol Parameter Value Unit
V
V
V
I
o
I
o
P
T
stg,Tj
(*)Internally limited
Operating Supply Voltage 18 V
s
DC Supply Voltage 28 V
s
Peak Supply Voltage(for 50ms) 40 V
s
(*) Peak Output Current (nonrepetitive t = 0.1ms) 4.5 A
(*)
Peak Output Current (repetitive f ≥10Hz)
Power Dissipation at Tcase = 85°C
tot
3.5 A
16 W
Storageand Junction Temperature –40 to 150
THERMALDATA
Symbol Parameter Value Unit
R
thj-case
ThermalResistance Junction-case Max. 4 V
°C
2/8
TDA7240A
ELECTRICAL CHARACTERISTICS (referto the circuitof fig.1,T
= 14.4V)
V
s
=25°C,Rth(heatsink)= 4°C/W,
amb
Symbol Parameter Test Conditions Min. Typ. Max. Unit
SupplyVoltage 18 V
V
s
OutputOffset Voltage 150 mV
V
os
TotalQuiescent Current
I
d
OutputPower f= 1kHz; d = 10%
P
o
d Distortion
R
L
R
L
P
o
R
L
P
o
=4Ω
=4
Ω
= 50mWto 12W
=8
Ω
= 50mWto 12W
=4Ω
R
L
=8
R
L
f = 1kHz
f = 1kHz
Ω
18
10
65 120 mA
20
12
0.1 0.5 %
0.05 0.5 %
GV VoltageGain f = 1KHz 39.5 40 40.5 dB
SVR SupplyVoltage Rejection
TotalInput Noise
E
N
Efficiency
η
Stand-byCurrent 200
I
sb
InputResistance f = 1kHz 70
R
i
InputSensitivity
V
i
Low Frequency Roll Off
f
L
(–3dB)
f
High Frequency Roll Off
H
f = 100Hz R
= 10KΩ
R
g
=4Ω f = 1KHz
R
L
f = 1kHz;P
Po = 15W; R
Po = 15W; RL = 4
= 2W; RL=4Ω
o
=4Ω
L
Ω
=10KΩ
g
(*)
(**)
35 40 dB
2
310
65 %
28 mV
30 Hz
25 kHz
(–3dB)
A
Stand-byAttenuation Vo= 2Vrms 70 90 dB
s
V
TH (pin2)
(*)B= Curve A (**)B = 22Hz to 22KHz
Stand-byThreshold 1 V
W
W
µV
µV
µA
kΩ
Figure2:P.C. Board and Components layout of the Circuit of Fig. 1.(1:1scale)
3/8
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