TDA7297SA

TDA7297SA 10W+10W DUAL BRIDGE AMPLIFIER ■ ■ WIDE SUPPLY VOLTAGE RANGE (6V-18V) MINIMUM EXTERNAL COMPONENTS – NO SWR CAPACITOR TECHNOLOGY BI20II – NO BOOTSTRAP ) s ( ct – 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. ) (s BLOCK AND APPLICATION DIAGRAM u d o r P e CLIPWATT15 ORDERING NUMBER: TDA7297SA t e l o Pin to pin compatible with: TDA7297, TDA7266B, TDA7266SA, TDA7266M, TDA7266MA, TDA7266, & TDA7266S. s b O ct u d o Pr 0.22µF IN1 e t e ol VCC 470µF 3 4 + 100nF 13 1 OUT1+ 2 OUT1- 15 OUT2+ 14 OUT2- - ST-BY 7 s b O S-GND 0.22µF 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 = 70°C) Top Operating Temperature Tstg, Tj Storage and Junction Temperature 30 W 0 to 70 °C -40 to 150 °C THERMAL DATA Symbol Parameter Value Rth j-case Thermal Resistance Junction-case Rth j-amb Thermal Resistance Junction to ambient PIN CONNECTION (Top view) 15 OUT2+ 14 OUT2- IN2 12 11 bs 10 9 O ) 8 7 uc od e t e ol Pr ) s ( ct °C/W 48 °C/W u d o r P e t e l o VCC 13 t(s Unit Typ. = 1.8; Max. = 2.5 N.C. N.C. S-GND PW-GND ST-BY 6 MUTE 5 N.C. 4 IN1 3 VCC 2 OUT1- 1 OUT1+ D03AU1463 ELECTRICAL CHARACTERISTCS (VCC = 13V, RL = 8Ω, f = 1KHz, Tamb = 25°C unless otherwise specified) bs Symbol O 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 = 8Ω, f = 1KHz, Tamb = 25°C unless otherwise specified) Symbol Parameter Ri Input Resistance VTMUTE Mute Threshold VTST-BY St-by Threshold IST-BY Test Condition Vo = -30dB Typ. 25 30 Max. Unit KΩ 2.3 2.9 4.1 V 0.8 1.3 1.8 V 100 µA 500 µV µV St-by Current V6 = GND Total Output Voltage eN Min. A Curve; f = 20Hz to 20KHz 150 220 ) s ( ct 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 µP) 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. u d o r P e t e l o ) (s Figure 1. Microprocessor Application s b O ct o r P IN1 s b O e t e ol du C1 0.22µF VCC 3 4 + 1 C5 470µF OUT1+ 2 OUT1- 15 OUT2+ 14 OUT2- 13 C6 100nF - ST-BY R1 10K 7 C2 10µF S-GND µP 9 Vref C3 0.22µF IN2 MUTE R2 10K 12 + + - 6 C4 1µF PW-GND 8 + D95AU258A 3/11 TDA7297SA Figure 2. Microprocessor Driving Signals +VS(V) VIN (mV) VST-BY pin 7 1.8 ) s ( ct 1.3 u d o 0.8 VMUTE pin 6 r P e 4.1 t e l o 2.9 2.3 ) (s Iq (mA) s b O t c u d o r VOUT (V) P e OFF let o s b ST-BY PLAY MUTE MUTE ST-BY OFF D96AU259/mod B) Low Cost Application In low cost applications where the µP is not present, the suggested circuit is shown in fig.3. O 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 0.22µF IN1 R1 47K + - 12 6 ) (s ct du 15 OUT2+ 14 OUT2- t e l o s b O - 8 + D95AU260A o r P Figure 4. Distortion vs Output Power. O u d o OUT1- r P e + - MUTE e t e l 2 + IN2 PW-GND ) s ( ct 9 C5 0.22µF o s b C2 100nF 7 Vref 10 1 C1 470µF OUT1+ C4 10µF S-GND TH D (% ) 13 - ST-BY R2 47K 3 4 Figure 5. Distortion vs Frequency T H D (% ) 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 Rf=8Ω f=1KHz 10 8 6 ) (s d=10% d=1% 4 t c u 2 0 6 7 8 d o r 9 10 11 O 5 t c u P e 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 t e l o Attenuation (dB) s b O 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) t e l o Figure 8. Ptot & Efficiency vs Ouput Power bs 4.5 d o r 12 Vs(V) P e Ptot(W)10 (s) 4 Figure 10. Stand-By attenuation vs Vpin 7 D99AU1080 Po (W) 3.5 Vpin.6(V) 80 µ (%) Ptot Figure 11. Quiescent Current vs Supply Voltage Iq (mA) 70 8 60 65 µ 60 6 40 Vcc = 12V RL = 8Ω (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 ) s ( ct u d o r P e Figure 13. Evaluation Board Top Layer Layout t e l o ) (s s b O t c u d o r P e t e l o Figure 14. Evaluation Board Bottom Layer Layout s b O 7/11 TDA7297SA HEAT SINK DIMENSIONING: In order to avoid the thermal protection intervention, that is placed approximatively at Tj = 150°C, 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: ) s ( ct VCC = 13V, Rload = 8ohm, RTh j-c = 2.5 °C/W , Tamb max = 50°C 2 Vc c - + Iq ⋅ Vc c Pdmax = (N° channels) · -------------------------2 R loa d Π ⋅ -------------2 u d o r P e Pdmax = 2 · ( 4.28 ) + 0.5 = 9 W t e l o 150 – T am b max – 50- – 2.5 = 8.6°C/W - – R T h j-c = 150 --------------------(Heat Sinker) R Th c-a = ---------------------------------------9 P d max s b O In figure 15 is shown the Power derating curve for the device. ) (s Figure 15. Power derating curve t c u 35 d o r 30 P e 25 s b O Pd (W) t e l o (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 ) s ( ct u d o r P e t e l o ) (s s b O t c u d o r P e t e l o s b O 9/11 TDA7297SA mm inch DIM. MIN. TYP. MAX. MIN. TYP. 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 ) s ( ct u d o r P e 0.781 L 17.95 0.707 L1 14.45 0.569 L2 OUTLINE AND MECHANICAL DATA MAX. 10.7 11 11.2 0.421 0.433 L3 5.5 0.217 M 2.54 0.100 M1 2.54 0.100 t e l o 0.441 ) (s s b O Clipwatt15 t c u d o r P e t e l o s b O 0044538 10/11 TDA7297SA ) s ( ct u d o r P e t e l o ) (s s b O t c u d o r P e t e l o s b O 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 © 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