SGS Thomson Microelectronics TDA7241B Datasheet
20W BRIDGE AMPLIFIER FOR CAR RADIO
VERYLOW STAND-BY CURRENT
GAIN= 32dB
OUTPUT PROTECTED AGAINST SHORT
CIRCUITS TO GROUND AND ACROSS
LOAD
COMPACTHEPTAWATTPACKAGE
DUMP TRANSIENT
THERMALSHUTDOWN
LOUDSPEAKERPROTECTION
HIGHCURRENT CAPABILITY
LOW DISTORTION/ LOWNOISE
DESCRIPTION
The TDA7241B 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
TDA7241B occupies little space on the printed
circuit board.
Reliable operation is guaranteed by a compre-
TDA7241B
Heptawatt
ORDERING NUMBER: TDA7241BH
hensive array of on-chipprotectionfeatures.
These include protection against AC and DC out-
put short circuits (to ground and across the load),
load dump transients, and junction overtemperature. Additionally, the TDA7241B protects the
loudspeaker when one output is short-circuitedto
ground.
Figure 1: Test and Appliication Circuit
July 1997
1/7
TDA7241B
PIN CONNECTION (Topview)
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
V
I
O
I
O
P
tot
T
stg,Tj
Operating Supply Voltage 18 V
S
DC Supply Voltage 28 V
S
Peak Supply Voltage (t = 50ms) 40 V
S
Peak OutputCurrent (non repetitive t = 0.1ms) 4.5 A
Peak OutputCurrent (repetitive f > 10Hz) 3.5 A
Power Dissipationat T
=85°C16W
case
Storage and Junction Temperature -40 to 150 °C
THERMAL DATA
Symbol Description Value Unit
R
th j-case
Thermal Resistance Junction-case Max 4
C/W
°
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TDA7241B
ELECTRICAL CHARACTERISTICS (Refer to the circuit of Fig. 1; VS= 14.4V; Rth(heatsink) = 4°C/W,
=25°C,unlessotherwise specified
T
amb
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
S
I
d
V
OS
P
O
d Distortion R
G
V
SVR Supply Voltage Rejection f =100Hz R
E
n
η
I
sb
R
V
f
L
f
H
A
S
(pin.2) Stand-by Threshold 1 V
V
TH
T
sd
(*) B = Curve (**) B = 22Hz to 22KHz
Supply Range 18 V
Total Quiescent Current RL=4
Ω
Output OffsetVoltage 100 mV
Output Power . RL=2Ω
f = 1KHz d = 10% R
. R
=4
Ω
L
P
= 50mW to 12W
O
=8Ω f = 1KHz
R
L
P
= 50mW to 6W
O
=4Ω
L
=8
L
f = 1KHz
Ω
18
26
20
12
0.1 0.5 %
0.05 %
Voltage Gain f = 1KHz 31 32 33 dB
= 10KΩ 40 50 dB
g
Total InputNoise B = Curve A Rg= 10KΩ 2 µV
= 10KΩ 310mV
S
65 %
Efficiency R
B = 22Hz to 22KHz R
P
=4
L
= 20W
O
Ω
f = 1KHz
Stand-by Current 100 µA
Input Resistance f = 1KHz 70 KΩ
i
Input Sensitivity f = 1KHz
i
Low Frequency Roll Off (-3dB) PO= 15W RL=4
P
=2W RL=4
O
Ω
Ω
70 mV
30 Hz
High FrequencyRoll Off (-3dB) PO = 15W RL=4Ω 25 KHz
Stand-by Attenuation VO= 2Vrms 70 90 dB
ThermalShutdownJunctionTemp. 150
80 mA
W
C
°
Figure 2: P.C. Boardand ComponentLayout of the Circuit of Fig. 1 (1:1scale).
3/7
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