TDA7240A.pdf

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20W BRIDGE AMPLIFIER FOR CAR RADIO
[
TDA7240A
. COMPACT HEPTAWATT PACKAGE
20W BRIDGE AMPLIFIER FOR CAR RADIO
. OUTPUT PROTECTED AGAINST SHORT
. DUMP TRANSIENT
. THERMAL SHUTDOWN
. LOUDSPEAKER PROTECTION
. HIGH CURRENT CAPABILITY
. LOW DISTORTION/LOW NOISE
Heptawatt H
Heptawatt V
ORDERING NUMBERS:
TDA7240AH
TDA7240AV
DESCRIPTION
Reliable operation is guaranteed by a comprehen-
sive array of on-chip protection features. These in-
clude protection against AC and DC output short
circuits (to ground and across the load), load dump
transients, and junction overtemperature. Additio-
nally, theTDA7240Aprotectstheloudspeakerwhen
one output is short-circuited to ground.
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.
Figure 1: Test and Application Circuit
December 1998
1/8
. FEW EXTERNAL COMPONENTS
CIRCUITS TO GROUND AND ACROSS LOAD
11041436.002.png
TDA7240A
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 (for 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 Tcase = 85
°
C
16
W
T stg ,T j
Storage and Junction Temperature
–40 to 150
°
C
(*) Internally limited
THERMAL DATA
Symbol
Parameter
Value
Unit
R th j-case Thermal Resistance Junction-case
Max.
4
V
2/8
11041436.003.png
TDA7240A
ELECTRICAL CHARACTERISTICS (refer to the circuit of fig. 1, T amb =25 ° C, R th (heatsink) = 4 ° C/W,
V s = 14.4V)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V s
Supply Voltage
18
V
V os
Output Offset Voltage
150
mV
I d
Total Quiescent Current
R L =4
65
120
mA
P o
Output Power
f = 1kHz; d = 10%
W
R L =8
18
10
20
12
W
W
W
d
Distortion
R L =4
f = 1kHz
0.1
0.5
%
P o = 50mW to 12W
R L =8
f = 1kHz
0.05
0.5
%
P o = 50mW to 12W
GV
Voltage Gain
f = 1KHz
39.5
40
40.5
dB
SVR
Supply Voltage Rejection f = 100Hz
R g = 10K
W
35
40
dB
E N
Total Input Noise
R g = 10K
W
(*)
(**)
2
3
V
m
10
V
h
Efficiency
R L =4
f = 1KHz
65
%
I sb
Stand-by Current
200
m
A
R i
Input Resistance
f = 1kHz
70
k
W
V i
Input Sensitivity
f = 1kHz; P o = 2W; R L =4
W
28
mV
f L
Low Frequency Roll Off
(–3dB)
Po = 15W; R L =4
W
30
Hz
f H
High Frequency Roll Off
(–3dB)
Po = 15W; RL = 4
W
25
kHz
A s
Stand-by Attenuation
V o = 2Vrms
70
90
dB
V TH (pin2) Stand-by Threshold
1
V
(*) B= Curve A
(**) B = 22Hz to 22 KHz
Figure2: P.C. Board and Components layout of the Circuit of Fig. 1.(1:1scale)
3/8
W
R L =4
W
W
m
W
11041436.004.png
TDA7240A
APPLICATION SUGGESTION
The recommendedvalues of the componentsare thoseshown 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
2.2
W
Frequency Stability
Danger of High
Frequency Oscillation
C1
1
F
Input DC Decoupling Higher Turn On and
Stand-by Delay
Higher Turn On Pop.
Higher Low
Frequency Cutoff
C2
22
m
F
Ripple Rejection
Increase of SVR
Increase of the Turn
On Delay
Degradation of SVR
C3
22
m
F
Feedback low
Frequency Cutoff
Higher Low Frequency
Cutoff
C6, C7
0.22
m
F
Frequency Stability
Danger of Oscillation
C4
220
m
F
Supply Filter
Danger of Oscillation
C5
0.1
m
F
Supply Bypass
Danger of Oscillation
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
m
11041436.005.png
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
11041436.001.png

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