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| TDA7297 15+15W DUAL BRIDGE AMPLIFIER WIDE SUPPLY VOLTAGE RANGE (6V -18V) MINIMUM EXTERNAL COMPONENTS - NO SWR CAPACITOR - NO BOOTSTRAP - NO BOUCHEROT CELLS - INTERNALLY FIXED GAIN STAND-BY & MUTE FUNCTIONS SHORT CIRCUIT PROTECTION THERMAL OVERLOAD PROTECTION TECHNOLOGY BI20II Multiwatt 15 DESCRIPTION The TDA7297 is a dual bridge amplifier specially designed for TV and Portable Radio applications. ORDERING NUMBER: TDA7297 BLOCK AND APPLICATION DIAGRAM VCC 470F 0.22F IN1 3 4 + ST-BY 7 13 1 OUT1+ 100nF S-GND 9 Vref + + - 2 OUT1- 0.22F IN2 12 15 OUT2+ MUTE 6 PW-GND 8 + 14 OUT2- D94AU175B May 1997 1/9 TDA7297 ABSOLUTE MAXIMUM RATINGS Symbol VS IO Ptot Top Tstg, Tj Supply Voltage Output Peak Current (internally limited) Total Power Dissipation (Tcase = 70C) Operating Temperature Storage and Junction Temperature Parameter Value 20 2 33 0 to 70 -40 to +150 Unit V A W C C THERMAL DATA Symbol Rth j-case Description Thermal Resistance Junction to case Typ. 1.4 Value Max. 2 Unit C/W PIN CONNECTION (Top view) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 D95AU261 OUT2+ OUT2VCC IN2 N.C. N.C. S-GND PW-GND ST-BY MUTE N.C. IN1 VCC OUT1OUT1+ ELECTRICAL CHARACTERISTICS (VCC = 16.5V, RL = 8, f = 1kHz, Tamb = 25C unless otherwise specified.) Symbol VCC Iq VOS PO THD Parameter Supply Range Total Quiescent Current Output Offset Voltage Output Power Total Harmonic Distortion Test Condition RL = THD = 10% PO = 1W PO = 0.1W to 5W f = 100Hz to 15kHz f = 100Hz VR = 0.5V 13 Min. 6.5 Typ. 50 15 0.1 Max. 18 65 120 0.3 1 Unit V mA mV W % % dB dB dB C dB dB K SVR CT AMUTE TW GV Gv Ri Supply Voltage Rejection Crosstalk Mute Attenuation Thermal Threshold Closed Loop Voltage Gain Voltage Gain Matching Input Resistance 40 46 60 31 25 56 60 80 150 32 30 33 0.5 2/9 TDA7297 ELECTRICAL CHARACTERISTICS (Continued) Symbol VTMUTE VTST-BY IST-BY eN Parameter Mute Threshold St-by Threshold ST-BY current V6 = GND Total Output Noise Voltage Test Condition VO = -30dB Min. 2.3 0.8 Typ. 2.9 1.3 150 220 Max. 4.1 1.8 100 500 Unit V V A V V A curve f = 20Hz to 20kHz APPLICATION SUGGESTION STAND-BY AND MUTE FUNCTIONS (A) Microprocessor Application In order to avoid annoying "Pop-Noise" during Turn-On/Off transients, it is necessary to guarantee the right St-by and mute signals sequence. It is quite simple to obtain this function using a microprocessor (Fig. 1 and 2). At first St-by signal (from mP) goes high and the voltage across the St-by terminal (Pin 7) starts to increase exponentially. The external RC network is intended to turn-on slowly the biasing circuits of Figure 1: Microprocessor Application the amplifier, this to avoid "POP" and "CLICK" on the outputs. When this voltage reaches the St-by threshold level, the amplifier is switched-on and the external capacitors in series to the input terminals (C3, C5) start to charge. It's necessary to mantain the mute signal low until the capacitors are fully charged, this to avoid that the device goes in play mode causing a loud "Pop Noise" on the speakers. A delay of 100-200ms between St-by and mute signals is suitable for a proper operation. VCC C1 0.22F IN1 ST-BY R1 10K C2 10F C5 470F OUT1+ C6 100nF 4 3 + - 13 1 7 P S-GND 9 Vref + + 6 15 OUT2+ 2 OUT1- C3 0.22F IN2 MUTE R2 10K C4 1F 12 PW-GND 8 + 14 OUT2- D95AU258A 3/9 TDA7297 Figure 2: Microprocessor Driving Signals. +V S(V) +18 VIN (mV) VST-BY pin 7 1.8 1.3 0.8 VMUTE pin 6 4.1 2.9 2.3 Iq (mA) VOUT (V) OFF ST-BY PLAY MUTE MUTE ST-BY OFF D96AU259 (B) Low Cost Application In low cost applications where the mP is not present, the suggested circuit is shown in fig.3. The St-by and mute terminals are tied together and they are connected to the supply line via an external voltage divider. The device is switched-on/off from the supply line and the external capacitor C4 is intended to delay the St-by and mute threshold exceeding, avoiding "Popping" problems. 4/9 TDA7297 Figure 3: Stand-alone Low-cost Application. VCC IN1 R1 47K C3 0.22F IN1 ST-BY R2 47K C4 10F 7 C1 470F OUT1+ C2 100nF 4 3 + - 13 1 S-GND 9 Vref + + 15 OUT2+ 2 OUT1- C5 0.22F IN2 12 MUTE 6 PW-GND 8 + 14 OUT2- D95AU260 Figure 3b: PCB and Component Layout of the Application Circuit (Fig. 1). 5/9 TDA7297 Figure 4: Distortion vs Output Power T HD(%) 10 Figure 5: Distortion vs Output Power THD (% ) 10 Vcc = 12 V R l = 8 o hm 1 V cc = 16.5V R l = 8 ohm 1 f = 15KH z f = 5KH z 0.1 0.1 f = 5K Hz f = 15KH z f = 1KH z 0.010 0.1 1 10 20 0.010 0.1 f = 1K Hz 1 10 Po ut (W ) Pou t ( W ) Figure 6: Distortion vs Frequency T HD(%) 10 Figure 7: Frequency Respone Le ve l(d Br) 5 .00 0 0 4 .00 0 0 V cc = 16.5V R l = 8 o hm 1 3 .00 0 0 2 .00 0 0 1 .00 0 0 0 .0 Vc c = 1 6 .5 V Rl = 8 ohm Po u t = 1 W P o ut = 100m W 0.1 - 1.00 0 - 2.00 0 - 3.00 0 P o ut = 5W 0.010 100 - 4.00 0 - 5.00 0 1k 10k 20k 10 10 0 1k 10 k 10 0 k fre q ue n c y (Hz) fre q u en cy (Hz ) Figure 8: Output Power vs Supply Voltage Po (W ) 2 0 .0 00 1 8 .0 00 1 6 .0 00 1 4 .0 00 1 2 .0 00 1 0 .0 00 8 .00 00 6 .00 00 4 .00 00 d = 10 % d = 1% R l = 8 o hm f = 1K H z Figure 9: Total Power Dissipation & Efficiency vs Output Power Ptot(W) 16 14 12 10 8 6 4 2 Vcc = 16.5V Rl = 8ohm (both channels) f = 1KHz P tot (%) 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 2 .00 00 0 .0 6. 000 7.0 00 8.0 00 9. 0 00 10. 00 11 .0 0 12. 00 13. 00 14. 00 15 . 00 16. 00 17. 00 18. 00 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Vs(V) 2XPout(W) 6/9 TDA7297 Figure 10: Mute Attenuation vs. V pin.6 Attenuation (dB) 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 1 1.5 2 2.5 3 3.5 4 4.5 5 Figure 11: Stand-By Attenuation vs Vpin.7 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 Attenuation (dB) 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 Vpin.6(V) Vpin.7 (V) Figure 12: Quiscent Current vs. Supply Voltage Iq (mA) 70 65 60 55 50 45 40 35 30 6 7 8 9 10 11 12 13 14 15 16 17 18 Vsupply(V) 7/9 TDA7297 MULTIWATT15 PACKAGE MECHANICAL DATA DIM. A B C D E F G G1 H1 H2 L L1 L2 L3 L4 L7 M M1 S S1 Dia1 21.9 21.7 17.65 17.25 10.3 2.65 4.25 4.63 1.9 1.9 3.65 4.55 5.08 17.5 10.7 22.2 22.1 0.49 0.66 1.02 17.53 19.6 20.2 22.5 22.5 18.1 17.75 10.9 2.9 4.85 5.53 2.6 2.6 3.85 0.862 0.854 0.695 0.679 0.406 0.104 0.167 0.182 0.075 0.075 0.144 0.179 0.200 0.689 0.421 0.874 0.870 1.27 17.78 1 0.55 0.75 1.52 18.03 0.019 0.026 0.040 0.690 0.772 0.795 0.886 0.886 0.713 0.699 0.429 0.114 0.191 0.218 0.102 0.102 0.152 0.050 0.700 MIN. mm TYP. MAX. 5 2.65 1.6 0.039 0.022 0.030 0.060 0.710 MIN. inch TYP. MAX. 0.197 0.104 0.063 8/9 TDA7297 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. SGS-THOMSON Microelectronics products are not authorized for use as criticalcomponents in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1997 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. 9/9 |
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