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TDA7240
20WBRIDGE AMPLIFIER FOR CAR RADIO
TDA7240A20W BRIDGE AMPLIFIER FOR CAR RADIO. COMPACT HEPTAWATT PACKAGE. FEW EXTERNAL COMPONENTS. OUTPUT PROTECTED AGAINST SHORT
CIRCUITS TO GROUND AND ACROSS LOAD. DUMP TRANSIENT. THERMAL SHUTDOWN. LOUDSPEAKER PROTECTION. HIGH CURRENT CAPABILITY. LOW DISTORTION/LOWNOISE
DESCRIPTION
HeptawattH HeptawattV
ORDERINGNUMBERS:TDA7240AH TDA7240AV
The TDA7240Aisa 20W bridge audio amplifierIC
designed specially for car radio applications.
Thanksto the low external part count and compact
Heptawatt 7-pin power package the TDA7240A
occupies little spaceon the printed circuit board.
Reliable operationis guaranteedbya comprehen-
sive arrayof on-chip protectionfeatures. Thesein-
clude protection against AC and DC output short
circuits(to groundand across theload), loaddump
transients, and junction overtemperature. Additio-
nally,theTDA7240Aprotectstheloudspeakerwhen
oneoutputis short-circuitedto ground.
Figure1: Test and Application Circuit
ABSOLUTE MAXIMUMRATINGS
Symbol Parameter Value Unit Operating Supply Voltage 18 V DC Supply Voltage 28 V Peak Supply Voltage (for 50ms) 40 V(*) Peak OutputCurrent (non repetitivet= 0.1ms) 4.5 A(*) Peak OutputCurrent (repetitivef ≥10Hz) 3.5 A
Ptot Power Dissipationat Tcase= 85°C 16 W
Tstg,Tj Storage and JunctionTemperature –40to 150 °C
(*)Internallylimited
PIN CONNECTION (Top view)
THERMAL DATA
Symbol Parameter Value UnitRth j-case ThermalResistance Junction-case Max. 4 V
TDA7240A
ELECTRICAL CHARACTERISTICS (referto the circuitof fig.1, Tamb =25°C, Rth (heatsink)= 4°C/W,= 14.4V)
Symbol Parameter Test Conditions Min. Typ. Max. Unit Supply Voltage 18 V
Vos Output Offset Voltage 150 mV Total Quiescent Current RL =4Ω 65 120 mA Output Power f= 1kHz;d= 10% =4Ω =8Ω Distortion RL =4Ω f= 1kHz= 50mWto 12W
0.1 0.5 % =8Ω f= 1kHz= 50mWto 12W
0.05 0.5 % Voltage Gain f= 1KHz 39.5 40 40.5 dB
SVR Supply Voltage Rejectionf= 100Hz Rg= 10KΩ 35 40 dB Total Input Noise Rg= 10KΩ
(*)
(**)
310 Efficiency RL =4Ω f= 1KHz 65 %
Isb Stand-by Current 200 μA Input Resistance f= 1kHz 70 kΩ Input Sensitivity f= 1kHz;Po= 2W;RL =4Ω 28 mV Low Frequency RollOff
(–3dB)= 15W; RL =4Ω 30 Hz High Frequency RollOff
(–3dB)= 15W; RL=4Ω 25 kHz Stand-by Attenuation Vo= 2Vrms 70 90 dB
VTH (pin2) Stand-by Threshold 1 V
(*)B= CurveA (**)B= 22Hzto 22KHz
Figure2: P.C. Board and Components layoutof the Circuitof Fig. 1.(1:1scale)
TDA7240A
APPLICATION SUGGESTIONThe recommendedvaluesofthecomponentsare thoseshown onapplicationcircuitof Fig.1. Differentvalues
canbe used, the following table can help the designer.
Component Recommended
Value
Purpose Larger Than Smaller ThanR1,R2 2.2Ω Frequency Stability Dangerof High
Frequency Oscillation 1μF Input DC Decoupling Higher TurnOn and
Stand-by Delay
Higher TurnOn Pop.
Higher Low
Frequency Cutoff 22μF Ripple Rejection Increaseof SVR
Increaseof theTurn Delay
Degradationof SVR 22μF Feedback low
Frequency Cutoff
Higher Low Frequency
Cutoff
C6,C7 0.22μF Frequency Stability Dangerof Oscillation 220μF Supply Filter Dangerof Oscillation 0.1μF Supply Bypass Dangerof Oscillation
Figure4: Distortion vs. Output Power.
Figure3: OutputPower vs. Supply Voltage.
Figure6: Distortion vs. Output Power.
Figure5: OutputPower vs. Supplyvoltage.
TDA7240A
Figure8: SupplyVoltageRejection
vs. Frequency.
Figure7: Distortion vs. Frequency.
Figure10: PowerDissipation and Efficiency vs.
Output Power.
Figure9: Power Dissipation and Efficiencyvs.
OutputPower.
TDA7240A
HeptawattV
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX. 4.8 0.189 1.37 0.054 2.4 2.8 0.094 0.110 1.2 1.35 0.047 0.053 0.35 0.55 0.014 0.022 0.7 0.97 0.028 0.038 0.6 0.8 0.024 0.031 0.9 0.035 2.34 2.54 2.74 0.095 0.100 0.105 4.88 5.08 5.28 0.193 0.200 0.205 7.42 7.62 7.82 0.295 0.300 0.307 10.4 0.409 10.05 10.4 0.396 0.409 16.7 16.9 17.1 0.657 0.668 0.673 14.92 0.587 21.24 21.54 21.84 0.386 0.848 0.860 22.27 22.52 22.77 0.877 0.891 0.896 1.29 0.051 2.6 2.8 3 0.102 0.110 0.118 15.1 15.5 15.8 0.594 0.610 0.622 6 6.35 6.6 0.236 0.250 0.260 0.2 0.008 2.55 2.8 3.05 0.100 0.110 0.120 4.83 5.08 5.33 0.190 0.200 0.210 40° (typ.)
Dia 3.65 3.85 0.144 0.152
Dia.H2
GG1 G2
HEPTAMEC
OUTLINE AND
MECHANICAL DATA
TDA7240A
