TDA7494 10W AMPLIFIER WITH DC VOLUME CONTROL 10W OUTPUT POWER RL = 8Ω, @ THD = 10% VCC = 28V ST-BY AND MUTE FUNCTIONS LINEAR VOLUME CONTROL DC COUPLED WITH POWER OP AMPLIFIER NO BOUCHEROT CELL NO ST-BY RC INPUT NETWORK SIGNAL LINE OUTPUT BEFORE VOLUME CONTROLLING AND MUTING 3 SWITCHABLE VOLTAGE CONTROLLED INPUT PINS SINGLE SUPPLY RANGING UP TO 35V SHORT CIRCUIT PROTECTION THERMAL OVERLOAD PROTECTION INTERNALLY FIXED GAIN SOFT CLIPPING LOW TURN-ON TURN-OFF POP NOISE MULTIWATT 15 PACKAGE MULTIPOWER BI50II TECHNOLOGY Multiwatt15 ORDERING NUMBER: TDA7494 DESCRIPTION The TDA7494 10W is class AB power amplifier assembled in the @Multiwatt 15 package, specially designed for high quality sound, TV applications. Features of the TDA7494 include volume control, 3 switchable inputs, Stand-by and mute functions. BLOCK AND APPLICATION DIAGRAM 3x 470nF IN 1 SW 5 6 IN 2 2 1 IN 3 PWR GND SGN GND 13 1 +VCC 14 VOL 3 PWR 470µF MUTE/STBY PROTECTIONS 15 OUT 2K 8 2 100K 4 MONITOR OUT 100K 300nF 3 7 SVR 300nF 9 10 STAND-BY 470µF 10K 1µF D95AU414D SW CTL February 1997 VOL CTL MUTE 1/12 TDA7494 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VS DC Supply Voltage 35 V VIN Maximum Input Voltage 8 Vpp Total Power Dissipation (Tamb = 70°C) Ambient Operating Temperature Range (1) 16 -20 to +85 W °C Tstg, Tj Storage and Junction Temperature -40 to 150 °C V2, V3 Volume CTRL DC voltage 7 V Ptot Tamb (1) Operation between -20 to 85 °C guaranteed by correlation with 0 to 70°C. PIN CONNECTION 15 PWR GND 14 OUT 13 +VCC 12 N.C. 11 N.C. 10 MUTE 9 STAND-BY 8 SGN GND 7 SVR 6 IN 2 5 IN 1 4 MONITOR OUT 3 VOLUME CONTROL 2 SW CTL 1 IN 3 D95AU415A THERMAL DATA Symbol Parameter Rth j-case Rth j-amb Thermal Resistance Junction-case Thermal Resistance Junction-ambient Value Typ = 3.8 max Unit Max = 4.8 35 °C/W °C/W ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VS = 21V, RL = 8Ω; Rg = 50Ω; Tamb = 25°C; unless otherwise specified.) Symbol Supply Voltage Range Iq Total Quiescent Current DCVOS 2/12 Parameter VS Output DC Offset Referred to SVR Potential Test Condition Min. Typ. 11 22 No Input Signal VO Quiescent Output Voltage VS = 28V PO Output Power THD = 10%; VCC = 28V, RL = 8Ω THD = 1%; VCC = 28V -400 Max. Unit 35 V 50 mA 400 mV 14 V 8 6 10 8 W THD = 10%; VCC = 21V, THD = 1%; VCC = 21V, 5 3.5 5.5 4 W THD = 10%; VCC = 21V, RL = 4Ω THD = 1%; VCC = 21V, 5 3.9 7.5 5.5 W THD = 10%; VCC = 18V, THD = 1%; VCC = 18V 4.5 3.5 6 4.5 W THD = 10%; VCC = 18V, RL = 8Ω THD = 1%; VCC = 18V 3.5 2.5 3.75 2.85 W W TDA7494 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Condition THD Total Harmonic Distortion PO = 1W; f = 1KHz; Gv = 26dB Ipeak Top Output Peak Current (internally limited) Operating Temperature Min. Typ. Max. Unit 1.4 1.9 0.4 % 0 70 °C Vrms dB dB A Vin GV Input Signal Closed Loop Gain Vol Ctrl > 4.5V 24.5 26 2.8 27.5 GvLine Monitor Out Gain RLOAD Mon = ∞ -3 -1.5 0 AMinVol Attenuation at Min Volume Vol Ctrl < 0.5V 80 Total Output Noise f = 20Hz to 22KHz Play, max volume BW eN SR Ri RMon Rload Mon SVR 0.6 350 700 MHz µV f = 20Hz to 22KHz Play, max attenuation 60 100 µV f = 20Hz to 22KHz Mute 30 50 µV Slew Rate Input Resistance 5 22.5 8 30 Monitor Output Resistance 1.4 2 30 36 43 KΩ dB 60 73 dB 150 °C Monitor Output Load Supply Voltage Rejection f = 1kHz; max volume CSVR = 470µA; VRIP = 1VRMS f = 1kHz; max attenuation CSVR = 470µA; VRIP = 1VRMS TM Thermal Muting Ts Thermal Shut-down VST-BY VMUTE Stand-by threshold Mute Threshold Sel #1 Control Voltage Input #1 selected Sel #2 Control Voltage Sel #3 Control Voltage IqST-BY AMUTE Quiescent Current @ Stand-by Mute Attenuation IstbyBIAS Stand-by bias current ImuteBIAS IswitchBIAS dB V/µs KΩ 3 160 2.3 2.3 °C 2.7 2.7 V V 0 1 V Input #2 selected 2.3 2.7 V Input #3 selected 4 5 V 0.6 75 1 mA dB Stand by on; VST-BY = 5V; VMUTE = 5V; 80 150 µA Play or Mute 2 20 µA 60 2.5 2.5 KΩ Mute bias current Mute 1.5 10 µA Switch bias current Play Input #1 selected 0.5 -0.5 5 5 µA µA Input #2 selected Input #3 selected 1 1.5 10 20 µA µA 3/12 TDA7494 Figure 1: Test and Application Circuit. MONITOR OUT C3 470nF IN 1 C4 470nF IN 2 C5 470nF 13 4 SW 5 5K 1 6 14 2 1 VOL 3 15 TP1 4 3 1 C1 1000µF MUTE/STBY PROTECTIONS S1 R2 3.3K 2 8 3 7 9 GND 10 SVR JMP1 R3 100K R4 100K C6 300nF C7 300nF C8 470µF C9 1µF R5 10K +5V VOL P1 50K LOG SGN GND Figure 2: P.C.B. and component layout. 4/12 OUT PGND +5V 2 C10 470µF PWR IN 3 R1 3.3K +VCC C2 0.1µF +5V TP2 MUTE S2 +5V S3 STANDBY GND D96AU492B TDA7494 APPLICATION SUGGESTIONS The recommended values of the external components are those shown on the application circuit of figure 1. Different values can be used; the following table can help the designer. COMPONENT SUGGESTION VALUE R1 R2 3.3KΩ 3.3KΩ R3 100KΩ R4 100KΩ R5 P1 C1 1000µF C2 100nF C3 470nF Input DC decoupling C4 470nF Input DC decoupling C5 470nF Input DC decoupling C6 300nF C7 300nF C8 470µF C9 1µF C10 470µF LARGER THAN SUGGESTION PURPOSE Input switch circuit Input switch circuit SMALLER THAN SUGGESTION Vpin #2 shifted downward Vpin #2 shifted upward Vpin #2 shifted upward Vpin #2 shifted downward Input switch time constant Volume control time constant Larger Input Switch Time Smaller input switch time Larger Volume Regulation Time Smaller volume regulation time 10KΩ Mute time constant Larger mute on/off time Smaller mute on/off time 50KΩ Volume control circuit Supply voltage bypass Danger of oscillation Supply voltage bypass Lower low frequency cutoff Danger of oscillation Higher low frequency cutoff Lower low frequency cutoff Lower low frequency cutoff Higher low frequency cutoff Higher low frequency cutoff Input- switch time constant Larger-Input- switch time Smaller input- switch time Volume control time constant Larger volume regulation time Smaller volume regulation time Ripple Rejection Better SVR Worse SVR Mute time constant Larger mute on/off time Lower low frequency cutoff Smaller mute on/off time Higher low frequency cutoff Output DC decoupling TYPICAL CHARACTERISTICS: Refer to the Application Circuit of Fig.1 VS = 21V; RL = 8Ω; f = 1KHz; RS = 8Ω; Tamb = 25°C; RS = 50Ω; unless otherwise specified Figure 3: Output Power vs Supply Voltage POUT (W) Figure 4: Distortion vs Output Power D96AU517 D96AU518 d (%) 14 VS=28V RL=8Ω 12 1 10 8 f=15KHz d=10% f=1KHz 6 0.1 d=1% 4 2 0 0.01 5 10 15 20 25 30 Vs(V) 0 2 4 6 8 POUT(W) 5/12 TDA7494 Figure 5: Output Power vs Supply Voltage POUT (W) D96AU519 Figure 6: Distortion vs Output Power D96AU520 d (%) 7 RL=4Ω VS=21V RL=4Ω 6 1 5 d=10% f=15KHz 4 d=1% 3 f=1KHz 0.1 2 1 0 0.01 11 13 15 17 19 0 VS(V) Figure 7: Distortion vs Frequency 2 D96AU521 POUT(W) D96AU522 d (%) POUT=1W RL=8Ω POUT=1W RL=4Ω 1 1 0.1 0.1 f(Hz) 1K 100 6 Figure 8: Distortion vs Frequency d (%) 0.01 20 4 Figure 9: Quiescent Current vs Supply Voltage IQ (mA) D96AU523 0.01 20 f(Hz) 1K 100 Figure 10: Quiescent Output Voltage vs Supply Voltage D96AU524 VDDC (V) 28 15 26 13 24 11 22 20 9 18 7 5 16 10 6/12 14 18 22 26 30 VS(V) 10 14 18 22 26 30 VS(V) TDA7494 Figure 11: Gain vs Volume Control (pin #3) Gain (dB) 20 D96AU525 Figure 12: Supply Voltage Rejection vs Frequency D96AU526 SVR (dB) VRIP=1VRMS 10 -20 0 POUT=1W -10 MAX VOLUME -40 -20 -30 -40 -60 -50 MAX ATTENUATION -60 -80 -70 -80 -100 -90 0.0 1.0 2.0 3.0 4.0 Vpin#3(V) Figure 13: Stand-by Attenuation vs Vpin # 9 ATT (dB) D96AU527 20 100 1K f(Hz) Figure 14: Mute Atttenuation vs Vpin # 10 ATT (dB) D96AU528 0dB=1W 0 0dB=1W 0 -20 -20 -40 -40 -60 -80 -60 -100 -80 -120 -100 -140 0 1 2 3 Figure 15: Power Dissipation vs Output Power PDISS (W) 0 4 Vpin#9(V) D96AU529 1 2 3 4 Vpin#10(V) Figure 16: Power Dissipation vs Output Power PDISS (W) D96AU530 RL=4Ω RL=8Ω 8 8 VS=35V VS=21V 6 6 VS=28V 4 4 VS=21V 2 0 0.1 1 VS=18V 2 10 POUT(W) 0 0.1 1 10 POUT(W) 7/12 TDA7494 MUTE STAND-BY TRUTH TABLE MUTE H L H L ST-BY H H L L OPERATING CONDITION STANDBY STANDBY MUTE PLAY Turn ON/OFF Sequences (for optimising the POP performances) A) USING MUTE AND STAND-BY FUNCTIONS VS (V) 28 ST-BY pin#9 (V) 5 VSVR pin#7(V) 2.5V MUTE pin#10 (V) 5 INPUT (mV) VOUT (V) OFF STBY MUTE PLAY MUTE STBY OFF IQ (mA) D96AU531A B) USING ONLY THE MUTE FUNCTION To semplify the application, the stand-by pin can be connected directly to Ground. During the ON/OFF transitions we recommend to respect the following conditions: 8/12 - At the turn-on the transition mute to play must be made when the SVR pin is higher than 2.5V - At the turn-off the TDA7494 must be brought to mute from the play condition when the SVR pin is higher than 2.5V. TDA7494 PINS: IN3, IN1, IN2 PIN: SWITCH VS VS VS 10µA INn SWITCH 30K 100µA 10µA SVR D97AU581 D97AU582 PIN: VOLUME PIN: MONITOR VS 10µA 2K MONITOR VOL BUFFER D97AU584 D97AU591 PIN: SVR VS VS VS VS 1mA OUT L + - 20K 6K 1K 20K 6K 1K 30K SVR 30K - OUT R + 100µA D97AU585 9/12 TDA7494 PIN: ST-BY PIN: MUTE VS 10µA STBY VS MUTE 300 10K 200 50µA D97AU586 PIN: OUT D97AU587 PINS: PW-GND, S-GND VS VS OUT GND D97AU593 D97AU588 10/12 TDA7494 MULTIWATT15 PACKAGE MECHANICAL DATA 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 E 0.49 0.039 0.55 0.019 0.022 F 0.66 0.75 0.026 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 L 0.030 20.2 0.795 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 L7 2.65 2.9 0.104 0.713 0.114 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 11/12 TDA7494 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 critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. © 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. 12/12