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TDA7481
18W MONO CLASS-D AMPLIFIER
18W OUTPUT POWER: RL = 8/4; THD = 10% HIGH EFFICIENCY WIDE SUPPLY VOLTAGE RANGE (UP TO 25V) SPLIT SUPPLY OVERVOLTAGE PROTECTION ST-BY AND MUTE FEATURES SHORT CIRCUIT PROTECTION THERMAL OVERLOAD PROTECTION DESCRIPTION The TDA7481 is an audio class-D amplifier assembled in Multiwatt15 package specially designed for high efficiency applications mainly for TV and Home Stereo sets. Figure 1: Test and Application Circuit.
Multiwatt15
ORDERING NUMBER: TDA7481
+5V R1 10K R2 10K ST-BY MUTE
+VCC
C5 100nF -VCC (Pin 14,15)
R3 30K ST-BY/ MUTE IN1 10
C6 100nF VCC POW 13 11 3 VCC SIGN
C7 2200F
N.C. 4
C1 2.2 F
BOOT C11 100nF OUT C12 560pF R5 150 L1 60H
IN1 C2 0.33F C4 4.7nF C3 1nF
9
+
PRE
+
PWM
1
5 FEEDCAP 12 SGN-GND 2 6 FREQ C8 270pF R4 12K (RF) C9 100nF -VCC C10 2200F 8 -VCC SIGN 14,15 -VCC POW VREG
C14 470nF
8
7
C15 100nF BOOTDIODE
D96AU534C
February 1998
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TDA7481
ABSOLUTE MAXIMUM RATINGS
Symbol VCC Ptot Tstg, Tj VFREQ Top ESD DC Supply Voltage Power Dissipation Tcase = 70C Storage and Junction Temperature Maximum Voltage Across RF (pin 6) Operating Temperature Range Max ESD On Pins Parameter Value 25 35 -40 to 150 8 0 to 70 1.2 Unit V W C V C KV
PIN CONNECTION (Top view)
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
D96AU535A
-VCC POW -VCC POW +VCC POW VREG +VCC SIGN ST-BY/MUTE IN -VCC SIGN SGN-GND FREQ FEEDCAP N.C. BOOT BOOTDIODE OUT
TAB CONNECTED TO PIN 8
THERMAL DATA
Symbol Rth j-case Parameter Thermal Resistance Junction-case Typ. 1.8 Max. 2.5 Unit C/W
PIN FUNCTIONS
N. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Name OUT BOOTDIODE BOOT NC FEEDCAP FREQ SGN-GND -VCC SIGN IN ST-BY/MUTE +VCC SIGN VREG +VCC POW -VCC POW -VCC POW Function PWM OUTPUT BOOTSTRAP DIODE ANODE BOOTSTRAP NOT CONNECTED FEEDBACK INTEGRATING CAPACITOR SETTING FREQUENCY RESISTOR SIGNAL GROUND SIGNAL NEGATIVE SUPPLY INPUT CONTROL STATE PIN POSITIVE SIGNAL SUPPLY INTERNAL VOLTAGE REGULATOR POSITIVE POWER SUPPLY NEGATIVE POWER SUPPLY (to be connected to pin 13 via CS) NEGATIVE POWER SUPPLY (to be connected to pin 13 via CS)
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TDA7481
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VCC = 18V; RL = 8; RS = 50; RF = 12K; Demod.. filter L = 60H, C = 470nF; f = 1KHz; Tamb = 25`C unless otherwise specified.)
Symbol VS Iq VOS PO PO Parameter Supply Range Total Quiescent Current Output Offset Voltage Output Power Output Power RL = , no LC filter PLAY condition THD = 10% THD = 1% VCC = 15V; RL = 4 THD = 10% THD = 1% (*) VCC = 18V; RL = 8; Rf = 12K P = 18W THD 10% VCC = 18V; RL = 8; Rf = 12K P = 18W THD 10% RL = 8; PO = 1W RL = 0 -70 15 10 Test Condition Min. 10 35 -30 18 13 18 13 3.5 85 Typ. Max. 25 55 10 Unit V mA mV W W W W W %
PD
Maximum Dissipated Power PO PO (**) PO + PD PI
Efficiency
THD Imax Tj GV eN VCCTOT MAX Ri SVR Tr, Tf RDSON FSW-OP FSW BF RF
Total Harmonic Distortion Overcurrent Protection Threshold Thermal Shut-down Junction Temperature Closed Loop Gain Total Input Noise Maximum Total VCC Protection Input Resistance Supply Voltage Rejection Rising and Falling Time Power Transistor on Resistance Switching Frequency Operative Range Switching Frequency Zero Signal Frequency Constant (***)
3.5
0.1 5 150
% A C 31 dB V V V k dB ns 200 KHz KHz Hz K
29 A Curve f = 20Hz to 22KHz 50 20 f = 100Hz; Vr = 0.5 46
30 7 12 30 60 50 0.4
100 100 120 1.4x109 12
140
Frequency Controller Resistor Range (****) MUTE & STAND-BY FUNCTIONS Stand-by range Mute Range Play Range (1) Mute Attenuation Quiescent Current @ Stand-by
7
14
VST-BY VMUTE VPLAY AMUTE IqST-BY
0.8 1.8 4 60 80 3 5 2.5
V V V dB mA
*: The output LC filter must be changed to: L = 30H; C = 1F **: PO = measured across the load using the following inductor: COIL 58120 MPPA2 (magnetics) TURNS: 28 1mm ***: The zero-signal switching frequency can be obtained using the following expression: F SW = BF/RF ****: The maximum value of RF is related to the maximum possible value for the voltage drop on RF itself (1) for V10 >5.2V, an input impedance of 10K is to be considered
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TDA7481
Figure 2: Recommended P.C. Board and Component Layout of the Circuit of Figure 1 (1.25:1 scale)
Note: Capacitor C5 must be as close as possible to device's pins 16 and 17
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TDA7481
MULTIWATT15 PACKAGE MECHANICAL DATA
DIM. 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 MIN. 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
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TDA7481
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) 1998 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
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