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| TDA7297SA 10W+10W DUAL BRIDGE AMPLIFIER s s WIDE SUPPLY VOLTAGE RANGE (6V-18V) MINIMUM EXTERNAL COMPONENTS - NO SWR CAPACITOR - NO BOOTSTRAP - NO BOUCHEROT CELLS - INTERNALLY FIXED GAIN TECHNOLOGY BI20II s s s STAND-BY & MUTE FUNCTIONS SHORT CIRCUIT PROTECTION THERMAL OVERLOAD PROTECTION CLIPWATT15 ORDERING NUMBER: TDA7297SA DESCRIPTION The TDA7297SA is a dual bridge amplifier specially designed for TV and Portable Radio applications. BLOCK AND APPLICATION DIAGRAM Pin to pin compatible with: TDA7297, TDA7266B, TDA7266SA, TDA7266M, TDA7266MA, TDA7266, & TDA7266S. 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 September 2003 1/11 TDA7297SA 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 30 0 to 70 -40 to 150 Unit V A W C C THERMAL DATA Symbol Rth j-case Rth j-amb Parameter Thermal Resistance Junction-case Thermal Resistance Junction to ambient Value Typ. = 1.8; Max. = 2.5 48 Unit C/W C/W PIN CONNECTION (Top view) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 OUT2+ OUT2VCC IN2 N.C. N.C. S-GND PW-GND ST-BY MUTE N.C. IN1 VCC OUT1OUT1+ D03AU1463 ELECTRICAL CHARACTERISTCS (VCC = 13V, 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 THD 10% PO = 1W PO = 0.1W to 2W f = 100Hz to 15KHz SVR CT AMUTE Tw GV GV Supply Voltage Rejection Crosstalk Mute Attenuation Thermal Threshold Closed Loop Voltage Gain Voltage Gain Matching 31 f = 100Hz, VR =0.5V 40 46 60 56 60 80 150 32 33 0.5 8.3 10 0.1 0.3 1 RL = Test Condition Min. 6.5 50 Typ. Max. 18 65 120 Unit V mA mV W % % dB dB dB C dB dB 2/11 TDA7297SA ELECTRICAL CHARACTERISTCS (continued) (VCC = 13V, RL = 8, f = 1KHz, Tamb = 25C unless otherwise specified) Symbol Ri VTMUTE VTST-BY IST-BY eN Parameter Input Resistance Mute Threshold St-by Threshold St-by Current V6 = GND Total Output Voltage A Curve; f = 20Hz to 20KHz 150 220 Vo = -30dB Test Condition Min. 25 2.3 0.8 Typ. 30 2.9 1.3 4.1 1.8 100 500 Max. Unit K V V A V V 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 Stby 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 P) 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 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. Figure 1. Microprocessor Application 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 3/11 TDA7297SA Figure 2. Microprocessor Driving Signals +VS(V) 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/mod B) Low Cost Application In low cost applications where the P 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. 4/11 TDA7297SA Figure 3. Stand-alone low-cost Application VCC C1 470F OUT1+ C2 100nF C3 0.22F R1 47K IN1 ST-BY R2 47K C4 10F 4 3 + - 13 1 7 S-GND 9 Vref + + 15 OUT2+ 2 OUT1- C5 0.22F IN2 12 MUTE 6 PW-GND 8 + 14 OUT2- D95AU260A Figure 4. Distortion vs Output Power. TH D (% ) 10 Vc c = 12 V R l = 8 o hm 1 Figure 5. Distortion vs Frequency T H D (% ) 10 V c c = 16.5V R l = 8 o hm 1 f = 1 5K Hz f = 5K Hz 0.1 0.1 P o ut = 1 0 0m W f = 1K Hz 0.010 100 P o ut = 5W 0.0 1 0 0.1 1 10 1k 10k 20k P ou t (W ) freq uen cy (H z) 5/11 TDA7297SA Figure 6. Frequency Response Level(d B r) 5.00 0 0 4.00 0 0 3.00 0 0 2.00 0 0 1.00 0 0 0.0 -1.00 0 -2.00 0 -3.00 0 -4.00 0 -5.00 0 10 10 0 1k 10 k 10 0 k V c c = 1 6 .5 V Rl = 8 ohm Pou t = 1W Figure 9. Mute Attenuation vs Vpin 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 freq uency (Hz ) Vpin.6(V) Figure 7. Output Power vs Supply Voltage Po (W) 10 8 6 4 2 0 D99AU1080 Figure 10. Stand-By attenuation vs Vpin 7 Attenuation (dB) Rf=8 f=1KHz d=10% d=1% 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 6 7 8 9 10 11 12 Vs(V) 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 Vpin.7 (V) Figure 8. Ptot & Efficiency vs Ouput Power Ptot(W)10 Figure 11. Quiescent Current vs Supply Voltage Iq (mA) 70 65 60 80 (%) Ptot 8 60 6 4 2 0 Vcc = 12V RL = 8 (both channel) f = 1KHz 40 55 50 20 45 40 0 0.5 1 2 3 4 5 6 7 8 9 0 10 11 35 30 6 7 8 9 10 11 12 13 14 15 16 17 18 2 x Pout (W) Vsupply(V) 6/11 TDA7297SA Figure 12. PC Board Component Layout Figure 13. Evaluation Board Top Layer Layout Figure 14. Evaluation Board Bottom Layer Layout 7/11 TDA7297SA HEAT SINK DIMENSIONING: In order to avoid the thermal protection intervention, that is placed approximatively at Tj = 150C, it is important the dimensioning of the Heat Sinker RTh (C/W). The parameters that influence the dimensioning are: - Maximum dissipated power for the device (Pdmax) - Max thermal resistance Junction to case (RTh j-c) - Max. ambient temperature Tamb max - Quiescent current Iq (mA) Example: VCC = 13V, Rload = 8ohm, RTh j-c = 2.5 C/W , Tamb max = 50C Vc c Pdmax = (N channels) * -------------------------- + I q V c c 2 R loa d -------------2 Pdmax = 2 * ( 4.28 ) + 0.5 = 9 W 150 - T am b max --------------------(Heat Sinker) R Th c-a = ---------------------------------------- - R T h j-c = 150 - 50 - 2.5 = 8.6C/W 9 P d max In figure 15 is shown the Power derating curve for the device. Figure 15. Power derating curve 35 30 25 (a) Pd (W) 20 15 10 5 0 0 40 80 Tamb (C) 120 160 (c) (b) a) b) c) d) Infinite Heatsink 3.5 C/ W 5.0 C/ W 7.0 C/ W 2 (d) 8/11 TDA7297SA Clipwatt Assembling Suggestions The suggested mounting method of Clipwatt on external heat sink, requires the use of a clip placed as much as possible in the plastic body center, as indicated in the example of figure 16. A thermal grease can be used in order to reduce the additional thermal resistance of the contact between package and heatsink. A pressing force of 7 - 10 Kg gives a good contact and the clip must be designed in order to avoid a maximum contact pressure of 15 Kg/mm2 between it and the plastic body case. As example , if a 15Kg force is applied by the clip on the package , the clip must have a contact area of 1mm2 at least. Figure 16. Example of right placement of the clip 9/11 TDA7297SA mm DIM. MIN. A B C D E F G G1 H1 H2 H3 L L1 L2 L3 M M1 10.7 19.85 17.95 14.45 11 5.5 2.54 2.54 11.2 0.421 0.49 0.67 1.14 17.57 1.27 17.78 12 18.6 0.781 0.707 0.569 0.433 0.217 0.100 0.100 0.441 0.15 1.55 0.55 0.73 1.4 17.91 0.019 0.026 0.045 0.692 0.050 0.700 0.480 0.732 TYP. MAX. 3.2 1.05 0.006 0.061 0.022 0.029 0.055 0.705 MIN. TYP. MAX. 0.126 0.041 Weight: 1.92gr inch OUTLINE AND MECHANICAL DATA Clipwatt15 0044538 10/11 TDA7297SA Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners (c) 2003 STMicroelectronics - All rights reserved STMicroelectronics GROUP OF COMPANIES Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States www.st.com 11/11 |
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