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TDA7480
10W MONO CLASS-D AMPLIFIER
10W OUTPUT POWER: RL = 8/4; THD = 10% HIGH EFFICIENCY NO HEATSINK SPLIT SUPPLY OVERVOLTAGE PROTECTION ST-BY AND MUTE FEATURES SHORT CIRCUIT PROTECTION THERMAL OVERLOAD PROTECTION DESCRIPTION The TDA7480 is an audio class-D amplifier assembled in Power DIP package specially designed for high efficiency applications mainly for TV and Home Stereo sets.
PDIP20 (14+3+3)
ORDERING NUMBER: TDA7480
Figure 1: Test and Application Circuit.
+5V R1 10K R2 7K ST-BY MUTE -VCC (Pin 17) R3 30K ST-BY/ MUTE IN1 C2 0.33F C4 4.7nF C3 1nF 8 FEEDCAP 12 N.C. 7,13 VCC POW 16
+VCC
C5 100nF
C6 100nF VCC SIGN 14 6
C7 2200F
C1 2.2 F
BOOT C11 100nF OUT C12 560pF R5 150 L1 60H
IN1
11
+
PRE
+
PWM
4
C14 470nF
8
BOOTDIODE SGN-GND 5 10 9 FREQ C8 270pF R4 12K RF C9 100nF -VCC C10 2200F 1,2,3,18,19,20 -VCC 17 -VCC 15 VREG
C15 100nF
D96AU536E
-VCC
September 1998
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TDA7480
ABSOLUTE MAXIMUM RATINGS
Symbol VCC Tstg, Tj VFREQ Top ESD DC Supply Voltage Storage and Junction Temperature Maximum Voltage Across VFREQ (Pin 9) Operating Temperature Range Maximum ESD on Pins Parameter Value 20 -40 to 150 8 -20 to 70 1.8 Unit V C V C kV
PIN CONNECTION (Top view)
Rth with "on board" Square Heatsink vs. copper area.
-VCC -VCC -VCC -VCC +VCC POW VREG +VCC SIGN N.C. STBY/MUTE IN
-VCC -VCC -VCC OUT BOOTDIODE BOOT N.C. FEEDCAP FREQ SGN-GND
1 2 3 4 5 6 7 8 9 10
D96AU537B
20 19 18 17 16 15 14 13 12 11
Rthj-a (C/W)
D97AU675
COPPER AREA 35 THICKNESS
60
50
PC BOARD
40
30 0 4 8 12 Area(cm2)
THERMAL DATA
Symbol Rth j-amb Rth j-pin Parameter Thermal Resistance Junction to ambient Thermal Resistance Junction to Pin Max. Value 80 12 Unit C/W C/W
PIN FUNCTIONS
N. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2/10 Name -VCC -VCC -VCC OUT BOOTDIODE BOOT NC FEEDCAP FREQUENCY SGN-GND IN ST-BY-MUTE NC +VCC SIGN VREG +VCC POW -VCC -VCC -VCC -VCC Function NEGATIVE SUPPLY. NEGATIVE SUPPLY. NEGATIVE SUPPLY. PWM OUTPUT BOOTSTRAP DIODE ANODE BOOTSTRAP CAPACITOR NOT CONNECTED FEEDBACK INTEGRATING CAPACITANCE SETTING FREQUENCY RESISTOR SIGNAL GROUND INPUT ST-BY/ MUTE CONTROL PIN NOT CONNECTED POSITIVE SIGNAL SUPPLY 10V INTERNAL REGULATOR POSITIVE POWER SUPPLY NEGATIVE SUPPLY (TO BE CONNECTED TO PIN 16 VIA C5) NEGATIVE SUPPLY NEGATIVE SUPPLY NEGATIVE SUPPLY
TDA7480
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VCC = 14V; RL = 8; RS = 50; Rf = 12K; Demod.. filter L = 60H, C = 470nF; f = 1KHz; Tamb = 25C unless otherwise specified.)
Symbol VS Iq VOS PO Parameter Supply Range Total Quiescent Current Output Offset Voltage Output Power RL = ; NO LC Filter Play Condition THD = 10% THD = 1% RL = 4 VCC = 10.5V THD = 10% THD = 1% Pd (*) PDMAX Dissipated Power at 1W Output Power Maximum Dissipated Power PO PO (**) PO + PD PI Rf = 12K P = 1W P = 10W THD 10% Rth-j-amb = 38C/W (Area 12cm2) THD 10% Rth-j-amb = 38C/W (Area 12cm2) RL = 8; PO = 0.5W RL = 0 3.5 80 -50 8.5 6 10 7 10 7 1 1.8 85 Test Condition Min. 10 25 Typ. Max. 16 40 +50 Unit V mA mV W W W W W W %
Efficiency
THD Imax Tj GV eN Ri SVR Tr, Tf RDSON FSW FSW_OP BF RF
Total Harmonic Distortion Overcurrent Protection Threshold Thermal Shut-down Junction Temperature Closed Loop Gain Total Input Noise Input Resistance Supply Voltage Rejection Rising and Falling Time Power Transistor on Resistance Switching Frequency Switching Frequency Operative Range Zero Signal Frequency Constant (***) Frequency Controller Resistor Range (****)
0.1 5 150 29 30 7 12 30 60 50 0.4 100 100 1.4x109 7 12 14 120 140 200 31
% A C dB V V K dB ns KHz KHz Hz K
A Curve f = 20Hz to 22KHz 20 f = 100Hz; Vr = 0.5 46
MUTE & STAND-BY FUNCTIONS VST-BY VMUTE VPLAY AMUTE IqST-BY Stand-by range Mute Range Play Range (1) Mute Attenuation Quiescent Current @ Stand-by 1.8 4 60 80 3 5 0.8 2.5 V V V dB mA
*: The output average power when the amplifier is playing music can be considered roughly 1/10 of the maximum output power. So it is useful to consider the dissipated power in this condition for thermal dimensioning. **: PO = measured across the load using the following inductor: COIL 58120 MPPA2 (magnetics) TURNS: 28 1mm COIL77120 KOOL M (magnetics) TURNS: 28 1mm ***: The zero-signal switching frequency can be obtained using the following expression: FSW = BF/RF ****: The maximum value of RF is related to the maximum possible value for the voltage drop on RF itself. (1): For V12 >5.2V, an input impedance of 10K is to be considered.
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TDA7480
Figure 2: Recomended P.C. Board and Component Layout of the Circuit of Figure1 (1.25:1 scale).
Note: Capacitor C5 must be as close as possible to device's pins 16 and 17
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TDA7480
Figure 3: Stereo Application in Single Supply.
R1 10K (*) +5V R3 30K C1 2.2F R2 10K MUTE ST-BY C6 100nF N.C. SGN-GND 7,13 10 VCC 14,16 6 BOOT C11 100nF OUT L1 60H C12 560pF R5 150 5 8 9 FREQ C8 270pF R4 12K C9 100nF L6 1H C20 100nF N.C. SGN-GND 7,13 10 VCC 14,16 6 BOOT C25 100nF OUT L5 60H C26 560pF R9 150 5 8 9 FREQ C24 270pF R8 12K C22 100nF 1,2,3,17, 18,19,20 -VCC SIGN 15 BOOTDIODE VREG C27 100nF L8 1H C28 470nF L7 1H PGND C21 47F/50VI C23 47F/50VI 1,2,3,17, 18,19,20 -VCC SIGN 15 BOOTDIODE VREG C15 100nF L4 1H C14 470nF L3 1H PGND C7 47F/50VI C10 47F/50VI -VCC (Pin 17) C5 100nF L2 1H R6 1K/2W R7 1K/2W OUT R C29 2200F/ 50VI C30 2200F/ 50VI +VS
MUTE/ ST-BY C2 0.33F IN LEFT
ST-BY/MUTE
4 12 11
TDA7480
LEFT
IN C3 1nF FEEDCAP
OUT LEFT
C4 4.7nF
C19 100nF
MUTE/ ST-BY C16 0.33F IN RIGHT
ST-BY/MUTE
4 12 11
OUT R
IN C17 1nF FEEDCAP
TDA7480
RIGHT
OUT RIGHT
C18 4.7nF
(*) +5V Referred to VCC/2
D97AU815C
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TDA7480
Figure 4: PC Board and component Layout of the Circuit of Figure 3.
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TDA7480
TYPICAL CHARACTERISTICS (Application Circuit of fig 1 unless otherwise specified) Figure 5. Output Power vs. Supply Voltage
Output Power (W)
Figure 6. Distortion vs. Output Power
THD (%)
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 10
10
Rl= 8 Ohm F= 1 KHz
Thd=10%
1
0.1
Thd=1%
Vs= +/- 14V Rl= 8 Ohm F= 1 KHz
10.5
11
11.5
12
12.5
13
13.5
14
14.5
15
15.5
16
0.01
0
1
2
3
4
5
6
7
8
9
10
Supply Voltage (+/- V)
Output Power (W)
Figure 7. Distortion vs. Output Power
Figure 8. Power Dissipation and Efficiency vs. Output Power
Power Dissipation (W)
Efficiency
10
THD (%)
2 1.8 1.6
Efficiency (%)
100
80
1
1.4 1.2 1
Vs= +/- 10.5V Rl= 4 Ohm F= 1 KHz
60
0.8 0.6 0.4 0.2 0 0 1 2 3 4
Pdiss Vs= +/- 14V Rl= 8 Ohm F= 1 KHz
40
0.1
20
0
1
2
3
4
5
6
7
8
9
10
5
6
7
8
9
0 10
Output Power (W)
Output Power (W)
Figure 9. Power Dissipation and Efficiency vs. Output Power
2.5
Figure 10. Mute Attenuation vs. Vpin 12
Attenuation (dB)
Power Dissipation (W)
Efficiency
Efficiency (%)
100 90 80 70
20 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120
2
Vs= +/- 14V Rl= 8 Ohm 0 dB =1 W @ F= 1 KHz
1.5
60 50
1
Pdiss Vs= +/- 10.5V Rl= 4 Ohm F= 1 KHz
40 30 20 10
0.5
0
0
1
2
3
4
5
6
7
8
9
0 10
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Output Power (W)
Vpin #12 (V)
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TDA7480
Figure 11. Supply Voltage Rejection vs. Frequency
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 0.01 0.1 1 10
Vs= +/- 14V Rl= 8 Ohm Rs= 50 Ohm Vr=0.5Vrms
S.V.R. (dB)
Frequency (KHz)
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TDA7480
POWERDIP20 PACKAGE MECHANICAL DATA
DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.30 1.27 8.80 2.54 22.86 7.10 5.10 0.130 0.050 0.38 0.51 0.85 0.50 0.50 24.80 0.346 0.100 0.900 0.280 0.201 0.015 1.40 mm TYP. MAX. MIN. 0.020 0.033 0.020 0.020 0.976 0.055 inch TYP. MAX.
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TDA7480
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. Specification 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 (c) 1998 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
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