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TDA7245
5W AUDIO AMPLIFIER WITH MUTING AND STAND-BY
MUTING AND STAND-BY FUNCTIONS VOLTAGE RANGE UP TO 30V HIGH SUPPLY VOLTAGE REJECTION SVR TYP = 50dB (f = 100Hz) MUSIC POWER = 12W (RL = 4, d = 10%) PROTECTION AGAINST CHIP OVER TEMPERATURE
Powerdip 9+9
DESCRIPTION The TDA7245 is a monolithic integrated circuit in 9+9 POWERDIP package, intended for use as Figure 1: Test and Application Circuit
ORDERING NUMBER: TDA7245
low frequency power amplifier in a wide range of applications in radio and TV sets.
March 1995
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TDA7245
ABSOLUTE MAXIMUM RATINGS
Symbol VS IO IO Ptot Tstg, Tj Supply Voltage Output Peak Current (non repetitive t = 100s) Output Peak Current (repetitive, f > 20Hz) Power Dissipation at Tamb = 80C at T case = 70C Storage and junction Temperature Parameter Value 30 3 2.5 1 6 -40 to 150 Unit V A A W W C
PIN CONNECTION (Top view)
THERMAL DATA
Symbol Rth j-case
Rth j-amb
Description Thermal Resistance junction-case Thermal Resistance junction-ambient Max Max
Value 15 70
Unit C/W C/W
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ELECTRICAL CHARACTERISTICS (Refer to the test circuit, Tamb = 25C, f = 1kHz; unless otherwise specified).
Symbol VS VO Id PO Parameter Supply Voltage Quiescent Output Voltage Quiescent Drain Current Output Power VS = 24V VS = 14V VS = 28V d = 1%, f = 1KHz VS = 14V, R L = 4 VS = 18V, R L = 8 d = 10%, f = 1KHz VS = 14V, R L = 4 VS = 18V, R L = 8 Music Power (*) VS = 24V, d = 10%, RL = 4 d Harmonic Distortion VS = 14V, R L = 4, PO = 50mW to 3W f = 1KHz f = 10KHz VS = 18V, R L = 8, PO = 50mW to 3.5W f = 1KHz f = 10KHz VS = 22V, R L = 16, PO = 50mW to 3W f = 1KHz f = 10KHz RI BW GV GV eN Input Impedance Small signal bandwidth (-3dB) Voltage Gain (open loop) Voltage Gain (closed loop) Total Input Noise f = 1kHz PO = 1W; R L = 4 VS = 14V f = 1kHz f = 1kHz B = 22 - 22,000Hz R s = 50 R s = 1k R s = 10k VS = 18V; RL = 8 PO = 5W; RS = 10K VS = 16.5V; R L = 8; f = 100Hz R s = 10k; Vr = 0.5Vrms 40 39 30 50 to 40,000 75 40 1.7 2 3 86 50 150 41 4 Test Condition Min. 12 11.6 17 21 4 4 5 5 12 35 Typ. Max. 30 Unit V V mA mA W W W W W
0.15 0.8
0.5
% %
0.12 0.5
% %
0.08 0.4
% % k Hz dB dB mV V V dB dB C
6
S/N SVR T sd
Signal to Noise Ratio Supply Voltage Rejection Thermal shut-down Junction Temperature
MUTE FUNCTION
Symbol Vm ATTm Parameter Pin 4 DC Voltage Muting Attenuation Test Condition Mute SW Open (play) f = 100Hz to 10kHz 60 Min. Typ. 6.4 65 Max. Unit V dB
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ELECTRICAL CHARACTERISTCS (Continued) STAND-BY FUNCTION
Symbol Vst-by Ist- by ATT st-by Vt Id st-by
Note (*): MUSIC POWER CONCEPT MUSIC POWER is ( according to the IEC clauses n.268-3 of Jan 83) the maximal power which the amplifier is capable of producing across the rated load resistance (regardless of non linearity) 1 sec after the application of a sinusoidal input signal of frequency 1KHz. According to this definition our method of measurement comprises the following steps: 1) Set the voltage supply at the maximum operating value -20% 2) Apply a input signal in the form of a 1KHz tone burst of 1 sec duration; the repetition period of the signal pulses is > 60 sec 3) The output voltage is measured 1 sec from the start of the pulse 4) Increase the input voltage until the output signal show a THD = 10% 5) The music power is then V2out/R1, where Vout is the output voltage measured in the condition of point 4) and R1 is the rated load impedance The target of this method is to avoid excessive dissipation in the amplifier.
Parameter Pin 5 DC Voltage Pin 5 Current Stand-by Attenuation Stand-by Threshold (pin 5) Stand-by Current
Test Condition Mute SW Open (play) Mute SW Closed (st-by) f = 100Hz to 10kHz VS = 14V
Min.
Typ. 6.4 160
Max. 280
Unit V A dB V
70
90 3.8 1 3
mA
Figure 2: Schematic Diagram
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Figure 3: P.C. Board and Components Layout of the Circuit of fig 2 (1:1 scale)
APPLICATION SUGGESTIONS The recommended values of the external components are those shown on the application circuit of fig.1. Different values can be used. The following table can help the dsigner.
Component R1 R2(*) R3(*) R4 C1 C2 C3 C4 C5 C6 C7 Rec. Value 20K 27K 270 1 22F 47F 0.1F 2.2F 470F 0.22F 1000F Purpose St-By Biasing Feedback Resistors Frequency Stability St-By Capacitor SVR Capacitor Input Capacitance Inverting Input DC Decoupling Supply Voltage Frequency Stability Output DC Decoupling Danger of Oscillations Higher Low Frequency Cut-off Larger than Rec. Value Incorrect St-By Function Increase of Gain Decrease of Gain Danger of Oscillations Longer ON/OFF Delay Time at St-By IN/OUT Worse Turn-On POP by VS and St-By Worse POP and Shorter Delay at St-By insertion Degradation of SVR Higher Low Frequency Cut-off Higher Low Frequency Cut-off Danger of Oscillations Smaller than Rec. Value Worse POP and Shorter Delay at St-By Insertion Decrease of Gain Increase of Gain
(*) The value of closed loop gain (GV = 1 + R2/R3) must be higher than 25dB.
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TDA7245
Figure 4: DC Output Voltage vs. Supply Voltage Figure 5: ID vs. Supply Voltage
Figure 6: Output Power vs. Supply Voltage
Figure 7: Output Power vs. Supply Voltage
Figure 8: Output Power vs. Supply Voltage
Figure 9: Distortion vs. Output Power
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TDA7245
Figure 10: Distortion vs. Output Power Figure 11: Distortion vs. Output Power
Figure 12: Supply Voltage Rejection vs. Frequency (play)
Figure 13: Power Dissipation & Efficiency vs. Output Power
Figure 14: Power Dissipation & Efficiency vs. Output Power
Figure 15: Vpin5 (=Vpin4) vs. Supply Voltage
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Figure 16: Ipin4 (muting) vs. Supply Voltage Figure 17: Ipin5 (St-By) vs. Supply Voltage
Figure 18: Quiescent Current (St-By) vs. Supply Voltage
Figure 19: Output Attenuation vs. Vpin5
Figure 20: Quiescent Current vs. Vpin5
MUTING / STAND- BY The muting function allows to inhibit the output signal through an external control signal. It can be used in many cases, when a temporary inhibition of the output signal is requested, for example: - in switch-on condition, to avoid preamplifier power-on transients - during switching at the input stages - during the receiver tuning. The stand-by function is very useful and permits a complete turn ON/OFF of the device through a low power signal, which can be provided by a P.
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TDA7245
THERMAL SHUTDOWN The presence of a thermal limiting circuit offers the following advantages: 1)An overload on the output (even if it is permanent), or an above limit ambient temperature can be easily tolerated since the Tj cannot be higher than 150C. 2)The heatsink can have a smaller factor of safety compared with that of a conventional circuit. There is no possibility of device damage due to high junction temperature. If for any reason, the junction temperature increase up to 150C, the thermal shutdown simply reduces the power dissipation and the current consumption. The maximum allowable power dissipation depends upon the junction-ambient thermal resistance. Fig. 21 shows this dissipable power as a function of ambient temperature for different thermal resistance. Figure 21: Maximum Allowable Power Dissipation vs. Ambient Temperature MOUNTING INSTRUCTIONS The TDA7245 is assembled in the POWERDIP, in which 9 pins (from 10 to 18) are attached to the frame and remove the heat produced by the chip. Figure 22 shows a PC Board copper area used as a Heatsink (l = 65mm). The Thermal Resistance Junction-Ambient is 35C. Figure 22: Example of Heatsink using PC Board Copper (l = 65mm)
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POWERDIP 18 (9+9) PACKAGE MECHANICAL DATA
DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.30 2.54 8.80 2.54 20.32 7.10 5.10 0.130 0.100 0.38 0.51 0.85 0.50 0.50 24.80 0.346 0.100 0.800 0.280 0.201 0.015 1.40 mm TYP. MAX. MIN. 0.020 0.033 0.020 0.020 0.976 0.055 inch TYP. MAX.
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Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics 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 SGS-THOMSON Microelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGSTHOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1996 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
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