TDA7297SA 10W+10W DUAL BRIDGE AMPLIFIER WIDE SUPPLY VOLTAGE RANGE (6V-18V) MINIMUM EXTERNAL COMPONENTS - NO SWR CAPACITOR TECHNOLOGY BI20II - NO BOOTSTRAP - NO BOUCHEROT CELLS - INTERNALLY FIXED GAIN STAND-BY & MUTE FUNCTIONS SHORT CIRCUIT PROTECTION THERMAL OVERLOAD PROTECTION DESCRIPTION The TDA7297SA is a dual bridge amplifier specially designed for TV and Portable Radio applications. CLIPWATT15 ORDERING NUMBER: TDA7297SA Pin to pin compatible with: TDA7297, TDA7266B, TDA7266SA, TDA7266M, TDA7266MA, TDA7266, & TDA7266S. BLOCK AND APPLICATION DIAGRAM VCC 470F 3 0.22F 4 IN1 + 100nF 13 1 OUT1+ 2 OUT1- 15 OUT2+ 14 OUT2- ST-BY 7 S-GND 0.22F IN2 9 Vref 12 + + - MUTE 6 PW-GND 8 + D94AU175B September 2003 1/11 TDA7297SA ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit Vs Supply Voltage 20 V IO Output Peak Current (internally limited) 2 A Ptot Total power dissipation (Tcase = 70C) Top Operating Temperature Tstg, Tj Storage and Junction Temperature 30 W 0 to 70 C -40 to 150 C THERMAL DATA Symbol Parameter Rth j-case Thermal Resistance Junction-case Rth j-amb Thermal Resistance Junction to ambient Value Unit Typ. = 1.8; Max. = 2.5 C/W 48 C/W PIN CONNECTION (Top view) 15 OUT2+ 14 OUT2- 13 VCC 12 IN2 11 N.C. 10 N.C. 9 S-GND 8 PW-GND 7 ST-BY 6 MUTE 5 N.C. 4 IN1 3 VCC 2 OUT1- 1 OUT1+ D03AU1463 ELECTRICAL CHARACTERISTCS (VCC = 13V, RL = 8, f = 1KHz, Tamb = 25C unless otherwise specified) Symbol VCC Iq Parameter Test Condition Supply Range Total Quiescent Current Typ. Max. 18 V 50 65 mA 120 mV 6.5 RL = VOS Output Offset Voltage PO Output Power THD 10% Total Harmonic Distortion PO = 1W THD Min. 8.3 10 0.1 PO = 0.1W to 2W f = 100Hz to 15KHz SVR CT AMUTE Supply Voltage Rejection 0.3 % 1 % 40 56 dB 46 60 dB Mute Attenuation 60 80 dB 150 C Thermal Threshold GV Closed Loop Voltage Gain 2/11 W Crosstalk Tw GV f = 100Hz, VR =0.5V Unit Voltage Gain Matching 31 32 33 dB 0.5 dB TDA7297SA ELECTRICAL CHARACTERISTCS (continued) (VCC = 13V, RL = 8, f = 1KHz, Tamb = 25C unless otherwise specified) Symbol Parameter Ri Input Resistance VTMUTE Mute Threshold VTST-BY St-by Threshold IST-BY eN Test Condition Vo = -30dB Min. Typ. 25 30 Unit K 2.3 2.9 4.1 V 0.8 1.3 1.8 V 100 A 500 V V St-by Current V6 = GND Total Output Voltage Max. A Curve; f = 20Hz to 20KHz 150 220 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 3 4 + 1 C5 470F OUT1+ 2 OUT1- 15 OUT2+ 14 OUT2- 13 C6 100nF - ST-BY R1 10K 7 C2 10F S-GND P 9 Vref C3 0.22F IN2 MUTE R2 10K 12 + + - 6 C4 1F PW-GND 8 + 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 C3 0.22F IN1 R1 47K ST-BY R2 47K 3 4 + 1 C1 470F OUT1+ 2 OUT1- 15 OUT2+ 14 OUT2- 13 C2 100nF 7 C4 10F S-GND 9 - Vref C5 0.22F + 12 + IN2 - MUTE PW-GND 6 8 + D95AU260A Figure 4. Distortion vs Output Power. Figure 5. Distortion vs Frequency T H D (% ) TH D (% ) 10 10 Vc c = 12 V R l = 8 o hm V c c = 16.5V R l = 8 o hm 1 1 f = 1 5K Hz P o ut = 1 0 0m W f = 5K Hz 0.1 0.1 f = 1K Hz 0.0 1 0 0.1 P o ut = 5W 1 P ou t (W ) 10 0.010 100 1k 10k 20k freq uen cy (H z) 5/11 TDA7297SA Figure 6. Frequency Response Figure 9. Mute Attenuation vs Vpin 6 Level(d B r) Attenuation (dB) 5.00 0 0 10 4.00 0 0 0 3.00 0 0 -10 V c c = 1 6 .5 V Rl = 8 ohm Pou t = 1W 2.00 0 0 -20 -30 1.00 0 0 -40 0.0 -50 -1.00 0 -60 -2.00 0 -70 -3.00 0 -80 -4.00 0 -90 -5.00 0 -100 10 10 0 1k 10 k 10 0 k 1 1.5 2 2.5 3 freq uency (Hz ) Figure 7. Output Power vs Supply Voltage 4 4.5 5 Figure 10. Stand-By attenuation vs Vpin 7 D99AU1080 Po (W) Rf=8 f=1KHz 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 10 8 6 d=10% d=1% 4 2 0 3.5 Vpin.6(V) 6 7 8 9 10 11 Attenuation (dB) 0 12 Vs(V) 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 80 (%) Ptot(W)10 Ptot Figure 11. Quiescent Current vs Supply Voltage Iq (mA) 70 8 60 65 60 6 40 Vcc = 12V RL = 8 (both channel) f = 1KHz 4 55 50 20 2 45 40 0 0 0.5 1 2 3 4 5 6 2 x Pout (W) 7 8 9 0 10 11 35 30 6 7 8 9 10 11 12 13 Vsupply(V) 6/11 14 15 16 17 18 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 2 Vc c - + Iq Vc c Pdmax = (N channels) * -------------------------2 R loa d -------------2 Pdmax = 2 * ( 4.28 ) + 0.5 = 9 W 150 - T am b max - 50- - 2.5 = 8.6C/W - - R T h j-c = 150 --------------------(Heat Sinker) R Th c-a = ---------------------------------------9 P d max In figure 15 is shown the Power derating curve for the device. Figure 15. Power derating curve 35 30 25 Pd (W) (a) 20 (c) 15 10 (b) (d) 5 0 0 40 80 Tamb (C) 8/11 120 160 a) Infinite Heatsink b) 3.5 C/ W c) 5.0 C/ W d) 7.0 C/ W 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 inch DIM. MIN. TYP. MAX. MIN. TYP. MAX. A 3.2 0.126 B 1.05 0.041 C 0.15 0.006 D 1.55 0.061 Weight: 1.92gr E 0.49 0.55 0.019 0.022 F 0.67 0.73 0.026 0.029 G 1.14 1.27 1.4 0.045 0.050 0.055 G1 17.57 17.78 17.91 0.692 0.700 0.705 H1 12 0.480 H2 18.6 0.732 H3 19.85 0.781 L 17.95 0.707 L1 14.45 0.569 L2 10.7 OUTLINE AND MECHANICAL DATA 11 11.2 0.421 0.433 L3 5.5 0.217 M 2.54 0.100 M1 2.54 0.100 0.441 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. 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