TDA7297

TDA7297 ® 15+15W DUAL BRIDGE AMPLIFIER WIDE SUPPLY VOLTAGE RANGE (6V -18V) MINIMUM EXTERNAL COMPONENTS – NO SVR CAPACITOR – NO BOOTSTRAP – NO BOUCHEROT CELLS – INTERNALLY FIXED GAIN STAND-BY & MUTE FUNCTIONS SHORT CIRCUIT PROTECTION THERMAL OVERLOAD PROTECTION TECHNOLOGY BI20II Multiwatt 15 ORDERING NUMBER: TDA7297 DESCRIPTION The TDA7297 is a dual bridge amplifier specially designed for TV and Portable Radio applications. BLOCK AND APPLICATION DIAGRAM VCC 470µF 3 0.22µF 4 IN1 + 100nF 13 1 OUT1+ 2 OUT1- 15 OUT2+ 14 OUT2- ST-BY 7 S-GND 0.22µF IN2 9 Vref 12 + + - MUTE 6 PW-GND 8 + D94AU175B September 2003 1/9 TDA7297 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V VS Supply Voltage 20 IO Ptot Output Peak Current (internally limited) 2 A Total Power Dissipation (Tcase = 70°C) 33 W Top Operating Temperature 0 to 70 °C -40 to +150 °C Tstg, Tj Storage and Junction Temperature THERMAL DATA Symbol Rth j-case Description Value Thermal Resistance Junction to case Typ. 1.4 Unit Max. 2 °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+ D95AU261 ELECTRICAL CHARACTERISTICS (VCC = 16.5V, RL = 8Ω, f = 1kHz, Tamb = 25°C unless otherwise specified.) Symbol VCC Iq VOS PO THD Parameter Supply Range Total Quiescent Current Output Offset Voltage Output Power Total Harmonic Distortion SVR CT AMUTE TW GV ∆Gv Ri Supply Voltage Rejection Crosstalk Mute Attenuation Thermal Threshold Closed Loop Voltage Gain Voltage Gain Matching Input Resistance 2/9 Test Condition Min. 6.5 RL = ∞ THD = 10% PO = 1W PO = 0.1W to 5W f = 100Hz to 15kHz f = 100Hz VR = 0.5V Typ. 50 13 40 46 60 15 0.1 31 56 60 80 150 32 25 30 Max. 18 65 120 0.3 1 33 0.5 Unit V mA mV W % % dB dB dB °C dB dB KΩ 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 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 Typ. 2.9 1.3 150 220 Max. 4.1 1.8 100 500 Unit V V µA µV µV 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 0.22µF IN1 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 3/9 TDA7297 Figure 2: Microprocessor Driving Signals. +VS(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 (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 4/9 MUTE ST-BY OFF D96AU259 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. TDA7297 Figure 3: Stand-alone Low-cost Application. VCC C3 0.22µF R1 47K IN1 ST-BY R2 47K 3 4 + 1 C1 470µF OUT1+ 2 OUT1- 15 OUT2+ 14 OUT2- 13 C2 100nF 7 C4 10µF S-GND 9 Vref C5 0.22µF 12 IN2 + + - MUTE PW-GND 6 8 + D95AU260A Figure 3b: PCB and Component Layout of the Application Circuit (Fig. 1). 5/9 TDA7297 Figure 4: Distortion vs Output Power Figure 5: Distortion vs Output Power TH D(%) TH D (% ) 10 10 Vcc = 12 V R l = 8 o hm Vcc = 16.5V R l = 8 ohm 1 1 f = 15K H z f = 15KH z f = 5K H z f = 5K H z 0.1 0.1 f = 1K H z f = 1K H z 0.010 0.1 1 10 20 0.010 0.1 1 10 P ou t (W ) P out (W ) Figure 7: Frequency Respone Figure 6: Distortion vs Frequency Level(d B r) T H D (% ) 10 5.00 0 0 4.00 0 0 3.00 0 0 V cc = 16.5V R l = 8 o hm V c c = 1 6 .5 V Rl = 8 ohm Pou t = 1W 2.00 0 0 1 1.00 0 0 0.0 P o ut = 100m W -1.00 0 0.1 -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 Figure 8: Output Power vs Supply Voltage P o(W ) Ptot(W) 16 18 .0 00 14 .0 00 µ(%) 14 Rl = 8 ohm f = 1K H z P tot 12 µ 10 12 .0 00 8 10 .0 00 8.00 00 10 0 k Figure 9: Total Power Dissipation & Efficiency vs Output Power 20 .0 00 16 .0 00 10 k freq uency (Hz ) freq uen cy (H z) d = 10 % Vcc = 16.5V Rl = 8ohm (both channels) f = 1KHz 6 6.00 00 d = 1% 4 4.00 00 2 2.00 00 0 0.0 6.0 00 7.0 00 8.0 00 9.0 00 10.00 11 .00 12.00 13.00 14.00 15 .00 16.00 17 .00 18.00 V s(V ) 6/9 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 2XPout(W) 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 TDA7297 Figure 10: Mute Attenuation vs. V pin.6 Figure 11: Stand-By Attenuation vs Vpin.7 Attenuation (dB) 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 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 Vpin.6(V) 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.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 mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 5 0.197 B 2.65 0.104 C 1.6 D 0.063 1 0.039 E 0.49 0.55 0.019 0.022 F 0.66 0.75 0.026 0.030 G 1.02 1.27 1.52 0.040 0.050 0.060 G1 17.53 17.78 18.03 0.690 0.700 0.710 H1 19.6 0.772 H2 20.2 0.795 L 21.9 22.2 22.5 0.862 0.874 0.886 L1 21.7 22.1 22.5 0.854 0.870 0.886 L2 17.65 18.1 0.695 L3 17.25 17.5 17.75 0.679 0.689 0.699 L4 10.3 10.7 10.9 0.406 0.421 0.429 0.713 L7 2.65 2.9 0.104 M 4.25 4.55 4.85 0.167 0.179 0.191 M1 4.63 5.08 5.53 0.182 0.200 0.218 S 1.9 2.6 0.075 0.102 S1 1.9 2.6 0.075 0.102 Dia1 3.65 3.85 0.144 0.152 8/9 OUTLINE AND MECHANICAL DATA 0.114 Multiwatt15 V TDA7297 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 9/9