Datasheet TDA7240A Datasheet (SGS Thomson Microelectronics)



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

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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

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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

TDA7240A

APPLICATION SUGGESTION

TherecommendedvaluesofthecomponentsarethoseshownonapplicationcircuitofFig.1.Differentvalues
canbe used,the followingtablecan helpthe designer.

Component Recommended

Value

R1,R2

C1

C2

C3

C6,C7

C4
C5

2.2Ω FrequencyStability Danger of High

1µF

22µF

22µF

0.22µF
220µF

0.1µF

Purpose Larger Than SmallerThan

FrequencyOscillation

InputDC Decoupling Higher Turn On and

Stand-byDelay

Ripple Rejection Increaseof SVR

Increaseof the Turn
On Delay

Feedback low
FrequencyCutoff

FrequencyStability Danger of Oscillation
Supply Filter Danger of Oscillation
Supply Bypass Danger of Oscillation

Higher Turn On Pop.
Higher Low
FrequencyCutoff

Degradation of SVR

Higher Low Frequency
Cutoff

Figure 3 : OutputPowervs.SupplyVoltage.

Figure 4 : Distortionvs. OutputPower.

Figure 6 : Distortionvs. OutputPower.Figure5 : OutputPowervs. Supplyvoltage.

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TDA7240A

Figure7 : Distortionvs. Frequency.

Figure 9 : PowerDissipationand Efficiencyvs.

OutputPower.

Figure 8 : SupplyVoltageRejection

vs. Frequency.

Figure10 : PowerDissipationandEfficiencyvs.

OutputPower.

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TDA7240A

DIM.

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
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
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
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

mm inch

0.587

0.051

0.260

OUTLINE AND

MECHANICAL DATA

Heptawatt V

H3

L

VV

E

L1

M1

A

C

D

M

D1

H2

V4

L9

H1

L5

Dia.

L2
L3

F

E1

E

GG1G2

F

L7

L4

L6

F1H2

HEPTAMEC

6/8

TDA7240A

DIM.

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
L2 15.8
L3 5.1
L5 2.6 3 0.102 0.118
L6 15.1 15.8 0.594 0.622
L7 6 6.6 0.236
L9 4.44 0.175

Dia 3.65 3.85 0.144 0.152

mm inch

0.173

0.622

0.201

0.260

OUTLINE AND

MECHANICAL DATA

Heptawatt H

7/8

TDA7240A

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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