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TDA7494
10W AMPLIFIER WITH DC VOLUME CONTROL
10W OUTPUT POWER RL = 8, @ 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 IN 2 IN 3
SW 5 6 1 2 3
VOL PWR
1
13 14
+VCC
470F MUTE/STBY PROTECTIONS
PWR GND
OUT
15
2K
SGN GND
8 2 4 3 SVR 7 9 STAND-BY 470F 10K 1F 10
100K
D95AU414D
MONITOR OUT 100K 300nF VOL CTL
300nF
SW CTL
MUTE
February 1997
1/12
TDA7494
ABSOLUTE MAXIMUM RATINGS
Symbol VS VIN Ptot Tamb Tstg, Tj V2, V3 DC Supply Voltage Maximum Input Voltage Total Power Dissipation (Tamb = 70C) Ambient Operating Temperature Range (1) Storage and Junction Temperature Volume CTRL DC voltage Parameter Value 35 8 16 -20 to +85 -40 to 150 7 Unit V Vpp W C C V
(1) Operation between -20 to 85 C guaranteed by correlation with 0 to 70C.
PIN CONNECTION
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
D95AU415A
PWR GND OUT +VCC N.C. N.C. MUTE STAND-BY SGN GND SVR IN 2 IN 1 MONITOR OUT VOLUME CONTROL SW CTL IN 3
THERMAL DATA
Symbol Rth j-case Rth j-amb Parameter Thermal Resistance Junction-case Thermal Resistance Junction-ambient max Value Typ = 3.8 35 Max = 4.8 Unit C/W C/W
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VS = 21V, RL = 8; Rg = 50; Tamb = 25C; unless otherwise specified.)
Symbol VS Iq DCVOS VO PO Parameter Supply Voltage Range Total Quiescent Current Output DC Offset Referred to SVR Potential Quiescent Output Voltage Output Power No Input Signal VS = 28V THD = 10%; VCC = 28V, RL = 8 THD = 1%; VCC = 28V THD = 10%; VCC = 21V, THD = 1%; VCC = 21V, THD = 10%; VCC = 21V, RL = 4 THD = 1%; VCC = 21V, THD = 10%; VCC = 18V, THD = 1%; VCC = 18V THD = 10%; VCC = 18V, RL = 8 THD = 1%; VCC = 18V 2/12 8 6 5 3.5 5 3.9 4.5 3.5 3.5 2.5 -400 14 10 8 5.5 4 7.5 5.5 6 4.5 3.75 2.85 Test Condition Min. 11 22 Typ. Max. 35 50 400 Unit V mA mV V W W W W W W
TDA7494
ELECTRICAL CHARACTERISTICS (continued)
Symbol THD Ipeak Top Vin GV GvLine AMinVol BW eN Total Output Noise f = 20Hz to 22KHz Play, max volume f = 20Hz to 22KHz Play, max attenuation f = 20Hz to 22KHz Mute SR Ri RMon Rload Mon SVR Slew Rate Input Resistance Monitor Output Resistance Monitor Output Load Supply Voltage Rejection f = 1kHz; max volume CSVR = 470A; VRIP = 1VRMS f = 1kHz; max attenuation CSVR = 470A; VRIP = 1VRMS TM Ts VST-BY VMUTE Sel #1 Sel #2 Sel #3 IqST-BY AMUTE IstbyBIAS Thermal Muting Thermal Shut-down Stand-by threshold Mute Threshold Control Voltage Control Voltage Control Voltage Quiescent Current @ Stand-by Mute Attenuation Stand-by bias current Stand by on; VST-BY = 5V; VMUTE = 5V; Play or Mute ImuteBIAS IswitchBIAS Mute bias current Switch bias current Mute Play Input #1 selected Input #2 selected Input #3 selected Input #1 selected Input #2 selected Input #3 selected 2.3 2.3 0 2.3 4 60 0.6 75 80 2 1.5 0.5 -0.5 1 1.5 5 22.5 1.4 30 36 60 Parameter Total Harmonic Distortion Output Peak Current Operating Temperature Input Signal Closed Loop Gain Monitor Out Gain Attenuation at Min Volume Vol Ctrl > 4.5V RLOAD Mon = Vol Ctrl < 0.5V Test Condition PO = 1W; f = 1KHz; Gv = 26dB (internally limited) 1.4 0 24.5 -3 80 0.6 350 60 30 8 30 2 43 73 150 160 2.5 2.5 2.7 2.7 1 2.7 5 1 150 20 10 5 5 10 20 3 700 100 50 26 -1.5 1.9 70 2.8 27.5 0 Min. Typ. Max. 0.4 Unit % A C Vrms dB dB dB MHz V V V V/s K K K dB dB C C V V V V V mA dB A A A A A A A
3/12
TDA7494
Figure 1: Test and Application Circuit.
MONITOR OUT IN 1
C3 470nF
4 5 6 1 2
13 SW 1 5K 14 3
VOL PWR
+VCC C2 0.1F C10 470F OUT PGND
C4 470nF IN 2 C5 470nF IN 3 +5V S1 R1 3.3K R2 3.3K 4 2 1 3 JMP1
MUTE/STBY PROTECTIONS 15 TP1 2 8 3 SVR R3 100K C6 300nF +5V VOL P1 50K LOG TP2 MUTE S2 STANDBY
D96AU492B
C1 1000F GND
7
9
10
R4 100K
C7 300nF
C8 470F
R5 10K
C9 1F +5V +5V
S3
SGN GND
GND
Figure 2: P.C.B. and component layout.
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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 R1 R2 R3 R4 R5 P1 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 SUGGESTION VALUE 3.3K 3.3K 100K 100K 10K 50K 1000F 100nF 470nF 470nF 470nF 300nF 300nF 470F 1F 470F PURPOSE Input switch circuit Input switch circuit Input switch time constant Volume control time constant Mute time constant Volume control circuit Supply voltage bypass Supply voltage bypass Input DC decoupling Input DC decoupling Input DC decoupling Input- switch time constant Volume control time constant Ripple Rejection Mute time constant Output DC decoupling Lower low frequency cutoff Lower low frequency cutoff Lower low frequency cutoff Larger-Input- switch time Larger volume regulation time Better SVR Larger mute on/off time Lower low frequency cutoff Danger of oscillation Danger of oscillation Higher low frequency cutoff Higher low frequency cutoff Higher low frequency cutoff Smaller input- switch time Smaller volume regulation time Worse SVR Smaller mute on/off time Higher low frequency cutoff LARGER THAN SUGGESTION SMALLER THAN SUGGESTION
Vpin #2 shifted downward Vpin #2 shifted upward Vpin #2 shifted upward Vpin #2 shifted downward Larger Input Switch Time Larger Volume Regulation Time Larger mute on/off time Smaller input switch time Smaller volume regulation time Smaller mute on/off time
TYPICAL CHARACTERISTICS: Refer to the Application Circuit of Fig.1 VS = 21V; RL = 8; f = 1KHz; RS = 8; Tamb = 25C; RS = 50; unless otherwise specified Figure 3: Output Power vs Supply Voltage
POUT (W) 14 12
VS=28V RL=8
D96AU517
Figure 4: Distortion vs Output Power
d (%)
D96AU518
1
10 8 6 4 2 0 d=1% d=10%
f=15KHz f=1KHz
0.1
0.01
5 10 15 20 25 30 Vs(V)
0
2
4
6
8 POUT(W)
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TDA7494
Figure 5: Output Power vs Supply Voltage
POUT (W) 7
RL=4
D96AU519
Figure 6: Distortion vs Output Power
d (%)
D96AU520
6 5
d=10%
1
VS=21V RL=4
4
d=1%
f=15KHz
3 2 1 0 11 13 15 17 19 VS(V)
0.1
f=1KHz
0.01 0 2 4 6 POUT(W)
Figure 7: Distortion vs Frequency
d (%)
POUT=1W RL=8
D96AU521
Figure 8: Distortion vs Frequency
d (%)
D96AU522
POUT=1W RL=4
1
1
0.1
0.1
0.01 20
100
1K
f(Hz)
0.01 20
100
1K
f(Hz)
Figure 9: Quiescent Current vs Supply Voltage
IQ (mA) 28
D96AU523
Figure 10: Quiescent Output Voltage vs Supply Voltage
VDDC (V) 15
D96AU524
26
13
24 22 20 18 16 10 14 18 22 26 30 VS(V)
11 9 7 5 10 14 18 22 26 30 VS(V)
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TDA7494
Figure 11: Gain vs Volume Control (pin #3)
Gain (dB) 20 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 0.0 1.0 2.0 3.0 4.0 Vpin#3(V)
-100 20 100 1K f(Hz) -80 -60 MAX ATTENUATION
D96AU525
Figure 12: Supply Voltage Rejection vs Frequency
SVR (dB) VRIP=1VRMS -20
D96AU526
POUT=1W
-40 MAX VOLUME
Figure 13: Stand-by Attenuation vs Vpin # 9
ATT (dB)
0dB=1W
D96AU527
Figure 14: Mute Atttenuation vs Vpin # 10
ATT (dB) 0 -20 -40 -60 -80 -100
0dB=1W
D96AU528
0 -20 -40 -60 -80 -100 -120 -140 0 1 2 3 4 Vpin#9(V)
0
1
2
3
4 Vpin#10(V)
Figure 15: Power Dissipation vs Output Power
PDISS (W)
RL=8
D96AU529
Figure 16: Power Dissipation vs Output Power
PDISS (W)
RL=4
D96AU530
8
VS=35V
8
VS=21V
6
VS=28V
6
4
VS=21V
4
VS=18V
2
2
0 0.1
1
10 POUT(W)
0 0.1
1
10 POUT(W)
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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:
- 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.
8/12
TDA7494
PINS: IN3, IN1, IN2
VS INn 30K 100A SVR
D97AU581
D97AU582
PIN: SWITCH
VS VS 10A SWITCH
10A
PIN: VOLUME
VS 10A VOL
PIN: MONITOR
2K
MONITOR
BUFFER
D97AU584
D97AU591
PIN: SVR
VS VS VS VS
1mA
+ 30K
OUT L
20K SVR 20K
6K
1K
6K
1K 30K OUT R -
100A
+
D97AU585
9/12
TDA7494
PIN: ST-BY PIN: MUTE
VS 10A STBY 200
VS MUTE 300 10K
50A
D97AU586
D97AU587
PIN: OUT
VS
PINS: PW-GND, S-GND
OUT
VS GND
D97AU593
D97AU588
10/12
TDA7494
MULTIWATT15 PACKAGE MECHANICAL DATA
DIM. MIN. A B C D E F G G1 H1 H2 L L1 L2 L3 L4 L7 M M1 S S1 Dia1 21.9 21.7 17.65 17.25 10.3 2.65 4.25 4.63 1.9 1.9 3.65 4.55 5.08 17.5 10.7 22.2 22.1 0.49 0.66 1.02 17.53 19.6 20.2 22.5 22.5 18.1 17.75 10.9 2.9 4.85 5.53 2.6 2.6 3.85 0.862 0.854 0.695 0.679 0.406 0.104 0.167 0.182 0.075 0.075 0.144 0.179 0.200 0.689 0.421 0.874 0.870 1.27 17.78 1 0.55 0.75 1.52 18.03 0.019 0.026 0.040 0.690 0.772 0.795 0.886 0.886 0.713 0.699 0.429 0.114 0.191 0.218 0.102 0.102 0.152 0.050 0.700 mm TYP. MAX. 5 2.65 1.6 0.039 0.022 0.030 0.060 0.710 MIN. inch TYP. MAX. 0.197 0.104 0.063
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. (c) 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.
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