TDA7241B.pdf

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20W BRIDGE AMPLIFIER FOR CAR RADIO
TDA7241B
20W BRIDGE AMPLIFIER FOR CAR RADIO
VERY LOW STAND-BY CURRENT
GAIN = 32dB
OUTPUT PROTECTED AGAINST SHORT
CIRCUITS TO GROUND AND ACROSS
LOAD
COMPACT HEPTAWATT PACKAGE
DUMP TRANSIENT
THERMAL SHUTDOWN
LOUDSPEAKER PROTECTION
HIGH CURRENT CAPABILITY
LOW DISTORTION / LOW NOISE
Heptawatt
ORDERING NUMBER: TDA7241BH
DESCRIPTION
The TDA7241B is a 20W bridge audio amplifier
IC designed specially for car radio applications.
Thanks to the low external part count and com-
pact Heptawatt 7-pin power package the
TDA7241B occupies little space on the printed
circuit board.
Reliable operation is guaranteed by a compre-
hensive array of on-chip protection features.
These include protection against AC and DC out-
put short circuits (to ground and across the load),
load dump transients, and junction overtempera-
ture. Additionally, the TDA7241B protects the
loudspeaker when one output is short-circuited to
ground.
Figure 1: Test and Appliication Circuit
July 1997
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TDA7241B
PIN CONNECTION (Top view)
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V S
Operating Supply Voltage
18
V
V S
DC Supply Voltage
28
V
V S
Peak Supply Voltage (t = 50ms)
40
V
I O
Peak Output Current (non repetitive t = 0.1ms)
4.5
A
I O
Peak Output Current (repetitive f > 10Hz)
3.5
A
P tot
Power Dissipation at T case =85
°
C
16
W
T stg ,T j
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; V S = 14.4V; R th (heatsink) = 4
°
C/W,
T amb =25 ° C, unless otherwise specified
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V S
Supply Range
18
V
I d
Total Quiescent Current
R L =4
W
80
mA
V OS
Output Offset Voltage
100
mV
P O
Output Power
.
R L =2
W
26
20
12
f = 1KHz d = 10%
R L =4
W
18
W
.
R L =8
W
d
Distortion
R L =4
W
f = 1KHz
0.1
0.5
%
P O = 50mW to 12W
R L =8 W
f = 1KHz
0.05
%
P O = 50mW to 6W
G V
Voltage Gain
f = 1KHz
31
32
33
dB
SVR
Supply Voltage Rejection
f =100Hz R g = 10K
W
40
50
dB
E n
Total Input Noise
B = Curve A
R g = 10K
W
2
m
V
B = 22Hz to 22KHz R S = 10K
W
3
10
V
h
Efficiency
R L =4
W
f = 1KHz
65
%
P O = 20W
I sb
Stand-by Current
100
m
A
R i
Input Resistance
f = 1KHz
70
K
W
V i
Input Sensitivity
f = 1KHz
P O =2W R L =4
W
70
mV
f L
Low Frequency Roll Off (-3dB)
P O = 15W
R L =4
W
30
Hz
f H
High Frequency Roll Off (-3dB)
PO = 15W R L =4
W
25
KHz
A S
Stand-by Attenuation
V O = 2Vrms
70
90
dB
V TH (pin.2) Stand-by Threshold
1
V
T sd
Thermal Shutdown Junction Temp.
150
°
C
(*) B = Curve (**) B = 22Hz to 22KHz
Figure 2: P.C. Board and Component Layout of the Circuit of Fig. 1 (1:1 scale).
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TDA7241B
Figure 3: Output Power vs. Supply Voltage
Figure 4: Output Power vs. Supply Voltage
Figure 5: Distortion vs. Output Power
Figure 6: Distortion vs. Output Power
Figure 7: Distortion vs. Output Power
Figure 8: SVR vs. Frequency
R g = 10k
W
R g =0
W
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TDA7241B
Figure 9: Power Dissipation and Efficiency vs.
Output Power
Figure 10: Power Dissipation and Efficiency vs.
Output Power
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