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TDA7296A
70V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
PRODUCT PREVIEW
VERY HIGH OPERATING VOLTAGE RANGE (35V) DMOS POWER STAGE HIGH OUTPUT POWER (UP TO 60W MUSIC POWER) MUTING/STAND-BY FUNCTIONS NO SWITCH ON/OFF NOISE NO BOUCHEROT CELLS VERY LOW DISTORTION VERY LOW NOISE SHORT CIRCUIT PROTECTION THERMAL SHUTDOWN CLIPPING DETECTION OUTPUT DESCRIPTION The TDA7296A is a monolithic integrated circuit in Multiwatt15 package, intended for use as audio class AB amplifier in Hi-Fi field applications (Home Stereo, self powered loudspeakers, Topclass TV). Thanks to the wide voltage range and to the high out current capability it is able to supply the highest power into both 4 and 8 loads Figure 1: Typical Application and Test Circuit
MULTIPOWER BCD TECHNOLOGY
Multiwatt 15 ORDERING NUMBER: TDA7296AV
even in presence of poor supply regulation, with high Supply Voltage Rejection. The built in muting function with turn on delay simplifies the remote operation avoiding switching on-off noises. The device provides a circuit for the detection of clipping in the output stages. The output, on open collector, is able to drive system with automatic level control.
C7 100nF R3 22K C2 R2 22F 680 C1 470nF +Vs IN2 7 -
+Vs
C6 1000F
+PWVs 13 14 OUT C5 22F 6 5 BOOTSTRAP +5V
IN+
3
+ CD
R1 22K IN+MUTE R5 10K MUTE STBY R4 22K C3 10F C4 10F 4 10 9
VM VSTBY
MUTE STBY 1 STBY-GND 8
THERMAL SHUTDOWN
S/C PROTECTION 15 -PWVs C8 1000F
D96AU494
-Vs C9 100nF -Vs
June 1996
This is preliminary information on a new product now in development. Details are subject to change without notice.
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TDA7296A
PIN CONNECTION (Top view)
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
D96AU495
-VS (POWER) OUT +VS (POWER) N.C. N.C. MUTE STAND-BY -VS (SIGNAL) +VS (SIGNAL) BOOTSTRAP CD SVR NON INVERTING INPUT INVERTING INPUT STAND-BY GND
BLOCK DIAGRAM
BOOTSTRAP +VS + + BOOTSTRAP
IN+
OUTPUT INCD + + CD
-VS BIPOLAR TRANSCONDUCTANCE INPUT STAGE MOS GAIN & LEVEL SHIFTING STAGE MOS OUTPUT STAGE SHORT CIRCUIT PROTECTION
D96AU496
ABSOLUTE MAXIMUM RATINGS
Symbol VS IO Ptot Top Tstg, Tj 2/13 Supply Voltage Output Peak Current Power Dissipation T case = 70C Operating Ambient Temperature Range Storage and Junction Temperature Parameter Value 35 5 50 0 to 70 150 Unit V A W C C
TDA7296A
THERMAL DATA
Symbol Rth j-case Description Thermal Resistance Junction-case Max Value 1.5 Unit C/W
ELECTRICAL CHARACTERISTICS (Refer to the Test Circuit VS = 24V, RL = 8, GV = 30dB; Rg = 50 ; Tamb = 25C, f = 1 kHz; unless otherwise specified.
Symbol VS Iq Ib VOS IOS PO Parameter Operating Supply Range Quiescent Current Input Bias Current Input Offset Voltage Input Offset Current RMS Continuous Output Power d = 0.5%: VS = 24V, R L = 8 VS = 21V, R L = 6 S = 18V, RL = 4 d = 10%; R L = 8 ; VS = 29V R L = 6 ; VS = 24V R L = 4; VS = 22V PO = 5W; f = 1kHz PO = 0.1 to 20W; f = 20Hz to 20kHz VS = 18V, RL = 4: PO = 5W; f = 1kHz PO = 0.1 to 20W; f = 20Hz to 20kHz SR GV GV eN fL, fH Ri SVR TS VST on VST off ATTst-by Iq st-by VMon VMoff ATTmute DC Off DC On Slew Rate Open Loop Voltage Gain Closed Loop Voltage Gain Total Input Noise Frequency Response (-3dB) Input Resistance Supply Voltage Rejection Thermal Shutdown f = 100Hz; Vripple = 0.5Vrms A = curve f = 20Hz to 20kHz PO = 1W 100 60 75 145 24 7 27 27 27 30 30 30 60 60 60 0.005 0.1 0.01 0.1 10 80 30 1 2 40 5 Test Condition Min. 10 20 30 Typ. Max. 35 60 500 +10 +100 Unit V mA nA mV nA W W W W W W % % % % V/s dB dB V V k dB C 1.5 3.5 70 90 1 3 1.5 3.5 60 THD = 1% THD = 10% 80 TBD TBD V V dB mA V V dB % %
Music Power (RMS) (*) t = 1s
d
Total Harmonic Distortion (**)
20Hz to 20kHz
STAND-BY FUNCTION (Ref: -V S or GND) Stand-by on Threshold Stand-by off Threshold Stand-by Attenuation Quiescent Current @ Stand-by Mute on Threshold Mute off Threshold Mute AttenuatIon Clipping detector OFF. CD output Duty Cycle Clipping detector On. CD output Duty Cycle
MUTE FUNCTION (Ref: -VS or GND)
Note (*): MUSIC POWER is 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. Note (**): Tested with optimized Application Board (see fig. 2)
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TDA7296A
Figure 2: P.C.B. and components layout of the circuit of figure 1. (1:1 scale)
TDA7296A
Note: The Stand-by and Mute functions can be referred either to GND or -VS. On the P.C.B. is possible to set both the configuration through the jumper J1.
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TDA7296A
APPLICATION SUGGESTIONS (see Test and Application Circuits of the Fig. 1) The recommended values of the external components are those shown on the application circuit of Figure 1. Different values can be used; the following table can help the designer.
COMPONENTS R1 (*) R2 R3 (*) R4 SUGGESTED VALUE 22k 680 22k 22k PURPOSE INPUT RESISTANCE LARGER THAN SUGGESTED INCREASE INPUT IMPRDANCE SMALLER THAN SUGGESTED DECREASE INPUT IMPEDANCE
CLOSED LOOP GAIN DECREASE OF GAIN INCREASE OF GAIN SET TO 30dB (**) INCREASE OF GAIN DECREASE OF GAIN ST-BY TIME CONSTANT MUTE TIME CONSTANT INPUT DC DECOUPLING FEEDBACK DC DECOUPLING MUTE TIME CONSTANT ST-BY TIME CONSTANT BOOTSTRAPPING LARGER MUTE ON/OFF TIME LARGER ST-BY ON/OFF TIME LARGER ST-BY ON/OFF TIME LARGER MUTE ON/OFF TIME SMALLER ST-BY ON/OFF TIME; POP NOISE SMALLER MUTE ON/OFF TIME HIGHER LOW FREQUENCY CUTOFF HIGHER LOW FREQUENCY CUTOFF SMALLER MUTE ON/OFF TIME SMALLER ST-BY ON/OFF TIME; POP NOISE SIGNAL DEGRADATION AT LOW FREQUENCY DANGER OF OSCILLATION DANGER OF OSCILLATION
R5 C1
10k 0.47F
C2
22F
C3 C4
10F 10F
C5
22F
C6, C8 C7, C9
1000F 0.1F
SUPPLY VOLTAGE BYPASS SUPPLY VOLTAGE BYPASS
(*) R1 = R3 FOR POP OPTIMIZATION (**) CLOSED LOOP GAIN HAS TO BE 24dB
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TDA7296A
TYPICAL CHARACTERISTICS (Application Circuit of fig 1 unless otherwise specified) Figure 3: Output Power vs. Supply Voltage. Figure 4: Distortion vs. Output Power
Figure 5: Output Power vs. Supply Voltage
Figure 6: Distortion vs. Output Power
Figure 7: Distortion vs. Frequency
Figure 8: Distortion vs. Frequency
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TDA7296A
TYPICAL CHARACTERISTICS (continued) Figure 9: Quiescent Current vs. Supply Voltage Figure10: SupplyVoltage Rejection vs. Frequency
Figure 11: Mute Attenuation vs. Vpin10
Figure 12: St-by Attenuation vs. Vpin9
Figure 13: Power Dissipation vs. Output Power
Figure 14: Power Dissipation vs. Output Power
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TDA7296A
INTRODUCTION In consumer electronics, an increasing demand has arisen for very high power monolithic audio amplifiers able to match, with a low cost the performance obtained from the best discrete designs. The task of realizing this linear integrated circuit in conventional bipolar technology is made extremely difficult by the occurence of 2nd breakdown phenomenon. It limits the safe operating area (SOA) of the power devices, and as a consequence, the maximum attainable output power, especially in presence of highly reactive loads. Moreover, full exploitation of the SOA translates into a substantial increase in circuit and layout complexity due to the need for sophisticated protection circuits. To overcome these substantial drawbacks, the use of power MOS devices, which are immune from secondary breakdown is highly desirable. The device described has therefore been developed in a mixed bipolar-MOS high voltage technology called BCD 80. monic distortion and good behaviour over frequency response; moreover, an accurate control of quiescent current is required. A local linearizing feedback, provided by differential amplifier A, is used to fullfil the above requirements, allowing a simple and effective quiescent current setting. Proper biasing of the power output transistors alone is however not enough to guarantee the absence of crossover distortion. While a linearization of the DC transfer characteristic of the stage is obtained, the dynamic behaviour of the system must be taken into account. A significant aid in keeping the distortion contributed by the final stage as low as possible is provided by the compensation scheme, which exploits the direct connection of the Miller capacitor at the amplifier's output to introduce a local AC feedback path enclosing the output stage itself.
2) Protections In designing a power IC, particular attention must be reserved to the circuits devoted to protection of the device from short circuit or overload conditions. 1) Output Stage Due to the absence of the 2nd breakdown pheThe main design task one is confronted with while nomenon, the SOA of the power DMOS transisdeveloping an integrated circuit as a power optors is delimited only by a maximum dissipation erational amplifier, independently of the technolcurve dependent on the duration of the applied ogy used, is that of realising the output stage. stimulus. The solution shown as a principle schematic by In order to fully exploit the capabilities of the Fig 15 represents the DMOS unity-gain output power transistors, the protection scheme implebuffer of the TDA7296A. mented in this device combines a conventional This large-signal, high-power buffer must be caSOA protection circuit with a novel local temperapable of handling extremely high current and voltture sensing technique which " dynamically" conage levels while maintaining acceptably low hartrols the maximum dissipation. Figure 15: Principle Schematic of a DMOS unity-gain buffer.
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TDA7296A
Figure 16: Turn ON/OFF Suggested Sequence
+Vs (V) +35
-35
-Vs VIN (mV)
VST-BY PIN #9 (V)
5V
VMUTE PIN #10 (V)
5V
IP (mA)
VOUT (V)
OFF ST-BY PLAY MUTE MUTE
D93AU013
ST-BY
OFF
In addition to the overload protection described above, the device features a thermal shutdown circuit which initially puts the device into a muting state (@ Tj = 145 oC) and then into stand-by (@ Figure 17: Single Signal ST-BY/MUTE Control Circuit
Tj = 150 oC). Full protection against electrostatic discharges on every pin is included. 3) Other Features The device is provided with both stand-by and mute functions, independently driven by two CMOS logic compatible input pins. The circuits dedicated to the switching on and off of the amplifier have been carefully optimized to avoid any kind of uncontrolled audible transient at the output. The sequence that we recommend during the ON/OFF transients is shown by Figure 16. The application of figure 17 shows the possibility of using only one command for both st-by and mute functions. On both the pins, the maximum applicable range corresponds to the operating supply voltage.
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MUTE MUTE/ ST-BY
20K 10K 30K
STBY
1N4148
10F
10F
D93AU014
TDA7296A
4) Clipping Detector Output The TDA7296A is equipped with an internal circuit able to detect the output stage saturation providing a proper current sinking into on open collector output (pin 5) when a certain distortion level is reached at output. This particular function allows gain compression facility whenever the amplifier is overdriven, thus obtaining high quality sound all listening levels. Figure 18: Clipping Detector Output Waveform
VO
OUTPUT SIGNAL
I CLIP
BRIDGE APPLICATION Another application suggestion is the BRIDGE configuration, where two TDA7296A are used, as shown by the schematic diagram of figure 19. In this application, the value of the load must not be lower than 8 Ohm for dissipation and current capability reasons. A suitable field of application includes HI-FI/TV subwoofers realizations. The main advantages offered by this solution are: - High power performances with limited supply voltage level. - Considerably high output power even with high load values (i.e. 16 Ohm). The characteristics shown by figures 21 and 22, measured with loads respectively 8 Ohm and 16 Ohm. With Rl= 8 Ohm, Vs = 18V the maximum output power obtainable is 60W, while with Rl=16 Ohm, Vs = 24V the maximum Pout is 60W.
S96AU498
t
Figure 19: Bridge Application Circuit
+Vs 0.22F 2200F 7 Vi 0.56F 22K 1 4 ST-BY/MUTE 20K 22F 1N4148 10 10K 30K 22F 3 0.56F 22K 1 4 7 13 6 + 2 14 22F 22K 9 15 8 2200F 22K -Vs 0.22F 10 680 9 15 8 3 + 2 13 6 14 22F 22K
680
D96AU497
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TDA7296A
Figure 20: Frequency Response of the Bridge Application Figure 21: Distortion vs. Output Power
Figure 22: Distortion vs. Output Power
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TDA7296A
MULTIWATT15 PACKAGE MECHANICAL DATA
DIM. MIN. A B C D E F G G1 H1 H2 L L1 L2 L3 L4 L7 M M1 S S1 Dia1 22.1 22 17.65 17.25 10.3 2.65 4.2 4.5 1.9 1.9 3.65 4.3 5.08 17.5 10.7 0.49 0.66 1.14 17.57 19.6 20.2 22.6 22.5 18.1 17.75 10.9 2.9 4.6 5.3 2.6 2.6 3.85 0.870 0.866 0.695 0.679 0.406 0.104 0.165 0.177 0.075 0.075 0.144 0.169 0.200 0.689 0.421 1.27 17.78 1 0.55 0.75 1.4 17.91 0.019 0.026 0.045 0.692 0.772 0.795 0.890 0.886 0.713 0.699 0.429 0.114 0.181 0.209 0.102 0.102 0.152 0.050 0.700 mm TYP. MAX. 5 2.65 1.6 0.039 0.022 0.030 0.055 0.705 MIN. inch TYP. MAX. 0.197 0.104 0.063
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TDA7296A
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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