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TDA2052
60W Hi-Fi AUDIO POWER AMPLIFIER WITH MUTE / STAND-BY
SUPPLY VOLTAGE RANGE UP TO ±25V SPLIT SUPPLY OPERATION HIGH OUTPUT POWER (UP TO 60W MUSIC POWER) LOW DISTORTION MUTE/STAND-BY FUNCTION NO SWITCH ON/OFF NOISE AC SHORT CIRCUIT PROTECTION THERMAL SHUTDOWN ESD PROTECTION DESCRIPTION The TDA2052 is a monolithic integrated circuit in Heptawatt package, intended for use as audio class AB amplifier in TV or Hi-Fi field application. Thanks to the wide voltage range and to the high out current capability it's able to supply the highTEST AND APPLICATION CIRCUIT
Heptawatt ORDERING NUMBER: TDA2052
est power into both 4 and 8 loads even in presence of poor supply regulation. The built in Muting/Stand-by function simplifies the remote operations avoiding also switching onoff noises.
February 1997
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This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
TDA2052
ABSOLUTE MAXIMUM RATINGS
Symbol VS IO Ptot Top Tstg, Tj DC Supply Voltage Output Peak Current (internally limited) Power Dissipation T case = 70°C Operating Temperature Range Storage and Junction Temperature Parameter Value ±25 6 30 0 to +70 -40 to +150 Unit V A W °C °C
PIN CONNECTION (Top view)
7 6 5 4 3 2 1 tab connected to pin 4
D95AU326
NON INVERTING INPUT(PLAY) INVERTING INPUT NON INVERTING INPUT(MUTE) -VS STAND-BY/MUTE +VS OUTPUT
BLOCK DIAGRAM
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THERMAL DATA
Symbol Rth j-case Description Thermal Resistance Junction-case Max Value 2.5 Unit °C/W
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, G V = 32dB; VS + 18V; f = 1KHz; Tamb = 25°C, unless otherwise specified.)
Symbol VS Iq Ib VOS IOS PO PO Parameter Supply Range Total Quiescent Current Input Bias Current Input Offset Voltage Input Offset Current Music Output Power IEC268-3 Rules (*) Output Power (continuous RMS) VS = + 22.5, RL = 4, d = 10%, t = 1s d = 10% RL = 4 R L = 8 VS = +22V, RL = 8 d = 1% R L = 4 R L = 8 VS = +22V, RL = 8 d Total Harmonic Distortion R L = 4 PO = 0.1 to 20W; f = 100Hz to 15KHz VS + 22V, R L = 8 PO = 0.1 to 20W; f = 100Hz to 15KHz SR GV eN Ri SVR TS Slew Rate Open Loop Voltage Gain Total Input Noise Input Resistance Supply Voltage Rejection Thermal Shutdown f = 100Hz, Vripple = 1VRMS A Curve f = 20Hz to 20KHz 500 40 50 145 3 50 35 30 60 40 22 33 32 17 28 VS = +22V Test Condition Min. +6 20 40 Typ. Max. +25 70 +0.5 +15 +200 Unit V mA µA mV nA W W W W W W W
0.1
0.7
%
0.1 5 80 2 3
0.5
% V/µs dB µV µV K dB °C
10
MUTE/STAND-BY FUNCTION (Ref. VS)
VTST-BY VTPLAY Iq ST-BY ATTST-BY Ipin3 Stand-by - Threshold Play Threshold Quiescent Current @ Stand-by Stand-by Attenuation Pin 3 Current @ Stand-by Vpin 3 = 0.5V 70 1 1.8 2.7 1 90 1 +10 4 3 V V mA dB µA
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 -10% 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.
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TDA2052
APPLICATIONS SUGGESTIONS (See Test and Application Circuit) The recommended values of the external components are those shown on the application circuit. Different values can be used; the following table can help the designer.
Comp. R1 R2 R3 R4 R5 R6 C1 C2 C3 C4 C5, C6 Value 22K (*) 560 22K (*) 22K (*) 22K 4.7 1µF 10µF 10µF 0.100µF 1000µF Purpose Input Impedance Closed Loop Gain set to 32dB (**) Input Impedance @ Mute Stand-by Time Constant Frequency Stability Input DC Decoupling Feedback DC Decoupling Stand-by Time Constant Frequency Stability Supply Voltage Bypass Danger of Oscillations Danger of oscillations Danger of oscillations Higher Low-frequency cut-off Higher Low-frequency cut-off Larger Than Increase of Input Impedance Decrease of Gain Increase of Gain Smaller Than Decrease of Input Impedance Increase of Gain Decrease of Gain
(*) R1 = R3 = R4 for POP optimization (**) Closed Loop Gain has to be 30dB
TYPICAL CHARACTERISTICS Figure 1: Output Power vs. Supply Voltage Figure 2: Distortion vs. Output Power
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Figure 3: Output Power vs. Supply Voltage. Figure 4: Distortion vs. Output Power.
Figure 5: Distortion vs. Frequency.
Figure 6: Distortion vs. Frequency.
Figure 7: Quiescent Current vs. Supply Voltage
Figure 8: Supply Voltage Rejection vs. Frequency.
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Figure 9: Bandwidth. Figure 10: Output Attenuation & Quiescent Current vs. Vpin3.
Figure 11: Total Power Dissipation & Efficiency vs. Output Power.
Figure 12: Total Power Dissipation & Efficiency vs. Output Power.
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TDA2052
Figure 13: P.C. Board and Components Layout of the Circuit of Fig. 14 (1:1 scale)
Figure 14: Demo Board Schematic.
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TDA2052
MUTE/STAND-BY FUNCTION The pin 3 (MUTE/STAND-BY) controls the amplifier status by three different thresholds, referred to -VS. When its voltage is lower than the first threshold (1V, with a +70mV hysteresis), the amplifier is in STAND-BY and all the final stage current generFigure 15. ators are off. Only the input MUTE stage is on in order to prevent pop-on problems. At Vpin3 =1.8V the final stage current generators are switched on and the amplifier operates in MUTE. For Vpin3 =2.7V the amplifier is definitely on (PLAY condition)
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TDA2052
SHORT-CIRCUIT PROTECTION The TDA 2052 has an original circuit which protects the device during accidental short-circuit between output and GND / -Vs / +Vs, taking it in STAND-BY mode, so limiting also dangerous DC current flowing throught the loudspeaker. If a short-circuit or an overload dangerous for the final transistors are detected, the concerned SOA circuit sends out a signal to the latching circuit (with a 10µs delay time that prevents fast random spikes from inadvertently shutting the amplifier off) which makes Q1 and Q2 saturate (see Block Diagram). Q1 immediately short-circuits to ground the A point turning the final stage off while Q2 short-circuits to ground the external capacitor driving the pin 3 (Mute/Stand-by) towards zero potential. Only when the pin 3 voltage becomes lower than 1V, the latching circuit is allowed to reset itself and restart the amplifier, provided that the shortcircuit condition has been removed. In fact, a window comparator is present at the output and it is aimed at preventing the amplifier from restarting if the output voltage is lower than 0.35 Total Supply Voltage or higher than 0.65 Total Supply Voltage. If the output voltage lies between these two thresholds, one may reasonably suppose the short-circuit has been removed and the amplifier may start operating again. The PLAY/MUTE/STAND-BY function pin (pin 3) is both ground- and positive supply-compatible and can be interfaced by means of the R5, C3 net either to a TTL or CMOS output (µ-Processor) or to a specific application circuit. The R5, C3 net is fundamental, because connecting this pin directly to a low output impedance driver such as TTL gate would prevent the correct operation during a short-circuit. Actually a final stage overload turns on the protection latching circuit that makes Q2 try to drive the pin 3 voltage under 0.8 V. Since the maximum current this pin can stand is 3 mA, one must make sure the following condition is met: R5 (VA - 0.7V) 3mA THERMAL PROTECTION The thermal protection operates on the 125µA current generator, linearly decreasing its value from 90°C on. By doing this, the A voltage slowly decreases thus switching the amplifier first to MUTE (at 145°C) and then to STAND-BY (155°C). Figure 16: Thermal Protection Block Diagram
The maximum allowable power dissipation depends on the size of the external heatsink (thermal resistance case-ambient); figure 17 shows the dissipable power as a function of ambient temperature for different thermal resistance.
Figure 17: Maximum Allowable Power Dissipation vs. Ambient Temperature.
that yields: R5, min = 1.5 K with VA=5V. In order to prevent pop-on and -off transients, it is advisable to calculate the C3, R5 net in such a way that the STAND-BY/MUTE and MUTE/PLAY threshold crossing slope (positive at the turn-on and vice-versa) is less than 100 V/sec.
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APPLICATION NOTES 90W MULTIWAY SPEAKER SYSTEM The schematic diagram of figure 18, shows the solution that we have closen as a suggestion for Hi-Fi and especially TV applications. The multiway system provides the separation of the musical signal not only for the loudspeakers, but also for the power amplifiers with the following advantages: Figure 18: Multiway Application Circuit - reduced power level required of each individual amplifier - complete separation of the ways (if an amplifier is affected by clipping distortion, the others are not) - protection of tweeters (the high power harmonics generated by low frequency clipping can not damage the delicate tweeters that are driven by independent power amplifier) - high power dedicated to low frequencies
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As shown in Figure 19, the R-C passive network for low-pass and High-pass give a cut with a slope of 12dB/octave A further advantage of this application is that connecting each speaker direcly to its amplifier, the musical signal is not modified by the variations of the impedance of the crossover over frequency. The subwoofer is designed for obtaining high sound pressure level with low distortion without stereo effect. In the application of figure 18, the subwoofer plays the 20 to 300 Hz frequency range, while the remaining 300 Hz to 20KHz are sent to two separate channels with stereo effect. The multiway system makes use of three TDA2052, one for driving the subwoofer with POUT higher than 40W (THD = 10%), 28W undistorted (THD = 0.01%), while the others two TDA2052 are used for driving the mid/high frequency speakers of L/R channels, delivering POUT = 25W (THD = 10%) and 20W @ THD = 0.01% Figure 20: Distortion vs Output Power (Subwoofer) Figure 19: Frequency Response
Figure 21:Distortion vs Output Power (Midrange/Tweeter)
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TDA2052
HEPTAWATT PACKAGE MECHANICAL DATA
DIM. MIN. A C D D1 E F F1 G G1 G2 H2 H3 L L1 L2 L3 L5 L6 L7 M M1 Dia 3.65 2.6 15.1 6 2.8 5.08 3.85 0.144 10.05 16.97 14.92 21.54 22.62 3 15.8 6.6 0.102 0.594 0.236 0.110 0.200 0.152 2.41 4.91 7.49 2.54 5.08 7.62 2.4 1.2 0.35 0.6 mm TYP. MAX. 4.8 1.37 2.8 1.35 0.55 0.8 0.9 2.67 5.21 7.8 10.4 10.4 0.396 0.668 0.587 0.848 0.891 0.118 0.622 0.260 0.095 0.193 0.295 0.100 0.200 0.300 0.094 0.047 0.014 0.024 MIN. inch TYP. MAX. 0.189 0.054 0.110 0.053 0.022 0.031 0.035 0.105 0.205 0.307 0.409 0.409
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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. © 1997 SGS-THOMSON Microelectronics Printed in Italy All Rights Reserved HEPTAWATTTM is a Trademark of the SGS-THOMSON Microelectronics 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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