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| TDA1905 5W AUDIO AMPLIFIER WITH MUTING DESCRIPTION The TDA1905 is a monolithic integrated circuit in POWERDIP package, intended for use as low frequency power amplifier in a wide range of applications in radio and TV sets: - muting facility - protection against chip over temperature - very low noise - high supply voltage rejection - low "switch-on" noise - voltage range 4V to 30V The TDA 1905 is assembled in a new plastic package, the POWERDIP, that offers the same assembly ease, space and cost saving of a normal dual in-line package but with a power dissipationof up to6W and a thermal resistance of 15C/W (junction to pins). ABSOLUTE MAXIMUM RATINGS Symbol Vs Io Io Vi Vi V11 Ptot Tstg, Tj Supply voltage Output peak current (non repetitive) Output peak current (repetitive) Input voltage Differential input voltage Muting thresold voltage Power dissipation at Tamb = 80C Tcase = 60C Storage and junction temperature Parameter Value 30 3 2.5 0 to + Vs 7 Vs 1 6 -40 to 150 Unit V A A V V V W W C Powerdip (8 + 8) ORDERING NUMBER : TDA 1905 APPLICATION CIRCUIT March 1993 1/14 TDA1905 PIN CONNECTION (top view) SCHEMATIC DIAGRAM THERMAL DATA Symbol Rth-j-case Rth-j-amb Parameter Thermal resistance junction-pins Thermal resistance junction-ambient max max Value 15 70 Unit C/W C/W 2/14 TDA1905 TEST CIRCUITS: WITHOUT MUTING WITH MUTING FUNCTION 3/14 TDA1905 ELECTRICAL CHARACTERISTICS (Refer to the test circuit, Tamb = 25 C, Rth (heatsink) = 20 C/W, unless otherwisw specified) Symbol Vs Vo Parameter Supply voltage Quiescent output voltage Vs = 4V Vs = 14V Vs = 30V Vs = 4V Vs = 14V Vs = 30V IC = 1A IC = 2A Po Output power d = 10% Vs = 9V Vs = 14V Vs = 18V Vs = 24V f = 1KHz RL = 4 (*) RL = 4 RL = 8 RL = 16 2.2 5 5 4.5 Test conditions Min. 4 1.6 6.7 14.4 2.1 7.2 15.5 15 17 21 0.5 V 1 2.5 5.5 5.5 5.3 Typ. Max. 30 2.5 7.8 16.8 Unit V V Id Quiescent drain current mA 35 VCE sat Output stage saturation voltage W d Harmonic distortion f = 1KHz Vs = 9V RL = 4 Po = 50 mW to 1.5W Vs = 14V RL = 4 Po = 50 mW to 3W Vs = 18V RL = 8 Po = 50 mW to 3W Vs = 24V RL = 16 Po = 50 mW to 3W f = 1KHz Vs = 9V Vs = 14V Vs = 18V Vs = 24V Vs Vs Vs Vs = 9V = 14V = 18V = 24V RL = RL = RL = RL = 4 4 8 16 Po Po Po Po = 2.5W = 5.5W = 5.5W = 5.3W 0.8 1.3 1.8 2.4 60 RL = RL = RL = RL = RL = RL = RL = RL = 4 4 8 16 4 4 8 16 0.1 0.1 0.1 0.1 % Vi Input sensitivity 37 49 73 100 mV Vi Input saturation voltage (rms) V Ri Id Input resistance (pin 8) Drain current f = 1KHz f = 1KHz Vs = 9V Vs = 14V Vs = 18V Vs = 24V f = 1KHz Vs = 9V Vs = 14V Vs = 18V Vs = 24V 100 K Po Po Po Po = 2.5W = 5.5W = 5.5W = 5.3W 380 550 410 295 mA Efficiency Po Po Po Po = 2.5W = 5.5W = 5.5W = 5.3W 73 71 74 75 % (*) With an external resistor of 100 between pin 3 and +Vs. 4/14 TDA1905 ELECTRICAL CHARACTERISTICS (continued) Symbol BW Gv Gv eN Parameter Small signal bandwidth (-3dB) Voltage gain (open loop) Voltage gain (closed loop) Total input noise Vs = 14V Vs = 14V f = 1KHz Vs = 14V f = 1KHz RL = 4 Po = 1W Rg = 50 Rg = 1K Rg = 10K Rg = 50 Rg = 1K Rg = 10K S/N Signal to noise ratio Vs = 14V Rg = Po = 5.5W Rg = R L = 4 Rg = Rg = 10K 0 10K 0 () 39.5 Test conditions RL = 4 Po = 1W Min. Typ. 40 to 40,000 75 40 1.2 1.3 1.5 2.0 2.0 2.2 90 92 87 87 40.5 Max. Unit Hz dB dB V 4.0 V 6.0 dB dB () () () SVR Supply voltage rejection RL = 8 Vs = 18V fripple = 100 Hz Rg = 10K Vripple = 0.5Vrms Ptot = 2.5W 40 50 115 dB C Tsd Thermal shut-down case temperatura (*) MUTING FUNCTION VTOFF Muting-off threshold voltage (pin 4) Muting-on threshold voltage (pin 4) Input-resistance (pin 5) Muting off Muting on R4 AT Input resistance (pin 4) Muting attenuation R g + R1 = 10K 150 50 60 1.9 0 6.2 80 200 10 30 4.7 1.3 Vs K K dB V V VTON R5 Note: () Weighting filter = curve A. ( ) Filter with noise bandwidth: 22 Hz to 22 KHz. (*) See fig. 30 and fig. 31 5/14 TDA1905 Figure 1. Quiescent output voltage vs. supply voltage Figure 2. Quiescent drain current vs. supply voltage Figure 3. Output power vs. supply voltage Fi g ure 4. Distortion v s. output power (RL = 16) Fig ur e 5 . Di stor tion v s. output power (RL = 8) Fi gur e 6 . Disto rtion vs . output power (RL = 4) Fi g ure 7. Distortion v s. frequency (RL = 16) Fig ur e 8 . Di stor tion v s. frequency (RL = 8) Fi gur e 9 . Disto rtion vs . frequency (RL = 4) 6/14 TDA1905 Figure 10. Open loop frequency response Figure 11. Output power vs. input voltage Figure 12. Value of capacitor Cx vs. bandwidth (BW) and gain (Gv) Figure 13. Supply voltage rejection vs. voltage gain (ref. to the Muting circuit) Figure 14. Supply voltage reection vs. source resistance Figure 15. Max power dissipation vs. supply voltage (sine wave operation) Figure 16. Power dissipation and efficiency vs. output power Figure 17. Power dissipation and efficiency vs. output power Figure 18. Power dissipation and efficiency vs. output power 7/14 TDA1905 APPLICATION INFORMATION Figure 19. Application circuit without muting Figure 20. PC board and components lay-out of the circuit of fig. 19 (1 : 1 scale) Figure 21. Application circuit with muting Figure 22. Delayed muting circuit 8/14 TDA1905 APPLICATION INFORMATION (continued) Figure 23. Low-cost application circuit without bootstrap. Figure 24. Output power vs. supply voltage (circuit of fig. 23) Figure 25. Two position DC tone control using change of pin 5 resistance (muting function) Figure 26. Frequency responseofthe circuitof fig. 25 Figure 27. Bass Bomb tone control using change of pin 5 resistance (muting function) Figure 28. Frequency responseofthecircuitof fig. 27 9/14 TDA1905 MUTING FUNCTION The output signal can be inhibited applying a DC voltage VT to pin 4, as shown in fig. 29 Figure 29 The input resistance at pin 5 depends on the threshold voltage VT at pin 4 and is typically : R5 = 200 K @ R5 = 10 1.9V VT 4.7V 0V VT 1.3V @ 6V VT Vs muting-off muting-on Referring to the following input stage, the possible attenuationof the input signal and therefore of the output signal can be found using the following expression: Vi = AT = V8 Rg + ( R8 * R5 ) R8 + 5 R8 * R5 ( ) R8 + R5 where R8 100 K - during switching at the input stages. - during the receiver tuning. The variable impedance capability at pin 5 can be useful in many applications and two examples are shown in fig. 25 and 27, where it has been used to change the feedback network, obtaining 2 different frequency responses. Considering Rg = 10 K the attenuation in the muting-on condition is typically A T = 60 dB. In the muting-off condition, the attenuation is very low, typically 1.2 dB. A very low current is necessary to drive the threshold voltage VT because the input resistance at pin 4 is greater than 150 K. The muting function can be usedin many cases, when a temporaryinhibition of the output signal is requested, for example: - in switch-on condition, to avoid preamplifier power-on transients (see fig. 22) 10/14 TDA1905 APPLICATION SUGGESTION The recommended values of the external components are those shown on the application circuit of fig. 21. When the supply voltage Vs is less than 10V, a 100 resistor must be connected between pin 2 and pin 3 in order to obtain the maximum output power. Different values can be used. The following table can help the designer. Component Raccom. value 10K Purpose Larger than recommended value Increase of the attenuation in muting-on condition. Decrease of the input sensitivity. Increase of gain. Smaller than recommended value Decrease of the attenuation in muting on condition. Decrease of gain. Increase quiescent current. Increase of gain. Allowed range Min. Max. Rg + R1 Input signal imped. for muting operation R2 10K Feedback resistors 9 R3 R3 R4 100 1K Frequency stability Decrease of gain. Danger of oscillation at high frequencies with inductive loads. 1K R5 100 Increase of the output swing with low supply voltage. Volume potentiometer Increase of the switch-on noise. Decrease of the input impedance and of the input level. Higher low frequency cutoff. Higher noise. Higher low frequency cutoff. Danger of oscillations. Increase of SVR increase of the switch-on time Degradation of SVR 47 330 P1 20K 10K 100K C1 C2 C3 C4 C5 C6 0.22F Input DC decoupling. Higher cost lower noise. 2.2F 0.1F 10F Inverting input DC decoupling. Supply voltage bypass. Ripple rejection Increase of the switchon noise. 0.1F 2.2F 100F C7 47F Bootstrap. Increase of the distortion at low frequency. Danger of oscillation. Higher low frequency cutoff. 10F 100F C8 C9 0.22F 1000F Frequency stability. Output DC decoupling. 11/14 TDA1905 THERMAL SHUT-DOWN 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 150 C. 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 temperatureincreases up to 150 C, the thermal shut-down simply reduces the power dissipation and the current consumption. The maximum allowable power dissipation depends upon the size of the external heatsink (i.e. its thermal resistance); fig. 32 shows this dissipable power as a function of ambient temperature for different thermal resistance. Figure 30. Output power and drain current vs. case temperature Figure 31. Output power and drain current vs. case temperature Figure 32. Maximum allowable power dissipation vs. ambient temperature MOUNTING INSTRUCTION : See TDA1904 12/14 TDA1905 POWERDIP PACKAGE MECHANICAL DATA DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.30 1.27 8.80 2.54 17.78 7.10 5.10 0.130 0.050 0.38 0.51 0.85 0.50 0.50 20.0 0.346 0.100 0.700 0.280 0.201 0.015 1.40 mm TYP. MAX. MIN. 0.020 0.033 0.020 0.020 0.787 0.055 inch TYP. MAX. 13/14 TDA1905 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. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON 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) 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A. 14/14 |
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