TDA7481

TDA7481 ® 18W MONO CLASS-D AMPLIFIER 18W OUTPUT POWER: RL = 8Ω/4Ω; 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 Multiwatt15 c u d 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. +5V ST-BY C1 2.2 µF ) s ( ct C5 100nF R3 30K t e l o C2 0.33µF C4 4.7nF s b O du ST-BY/ MUTE 10 C6 100nF 4 C7 2200µF VCC SIGN 13 11 3 9 + C3 1nF C11 100nF PWM + OUT 5 FEEDCAP SGN-GND 7 C8 270pF C12 560pF R5 150Ω 6 8 14,15 -VCC SIGN L1 60µH C14 470nF 8Ω VREG C15 100nF 2 FREQ September 2003 BOOT 1 - PRE 12 D96AU534C o r P o s b O - VCC POW N.C. IN1 IN1 e t le -VCC (Pin 14,15) o r P e MUTE ORDERING NUMBER: TDA7481 +VCC R1 10K R2 10K ) s t( BOOTDIODE -VCC POW R4 12KΩ (RF) -VCC C9 100nF C10 2200µF 1/6 TDA7481 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit ±25 V 35 –40 to 150 W °C 8 V DC Supply Voltage VCC Ptot Tstg, Tj Power Dissipation Tcase = 70°C Storage and Junction Temperature VFREQ Top Maximum Voltage Across RF (pin 6) ESD Max ESD On Pins Operating Temperature Range 0 to 70 °C ±1.2 KV PIN CONNECTION (Top view) 15 -VCC POW 14 -VCC POW 13 +VCC POW 12 VREG 11 +VCC SIGN 10 ST-BY/MUTE 9 IN 8 -VCC SIGN 7 SGN-GND 6 FREQ 5 FEEDCAP e t le 4 N.C. 3 so 1 ) s ( ct THERMAL DATA Symbol Rth j-case N. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 2/6 u d o r P e Name OUT BOOTDIODE BOOT NC FEEDCAP FREQ SGN-GND –VCC SIGN IN ST-BY/MUTE +VCC SIGN VREG +VCC POW -VCC POW -VCC POW BOOTDIODE OUT D96AU535A Thermal Resistance Junction-case t e l o s b O b O - Parameter PIN FUNCTIONS o r P BOOT 2 TAB CONNECTED TO PIN 8 c u d ) s t( Typ. Max. Unit 1.8 2.5 °C/W 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) TDA7481 ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VCC = ±18V; RL = 8Ω; RS = 50Ω; RF = 12KΩ; Demod.. filter L = 60µH, C = 470nF; f = 1KHz; Tamb = 25°‘C unless otherwise specified.) Symbol Parameter Test Condition Typ. Max. Unit 35 ±25 55 mA –70 -30 10 mV 15 10 18 13 W W 18 13 W W VCC = ±18V; RL = 8Ω; Rf = 12KΩ PΟ = 18W THD 10% 3.5 W VCC = ±18V; RL = 8Ω; Rf = 12KΩ PΟ = 18W THD 10% 85 % 0.1 5 % A Supply Range VOS Output Offset Voltage PLAY condition PO Output Power THD = 10% THD = 1% PO Output Power VCC = ±15V; RL = 4Ω THD = 10% THD = 1% (*) RL = ∞, no LC filter Total Quiescent Current PD Maximum Dissipated Power η Efficiency ≡ THD Imax PO PO (**) ≡ PO + PD PI RL = 8Ω; PO = 1W RL = 0 Total Harmonic Distortion Overcurrent Protection Threshold Tj Thermal Shut-down Junction Temperature GV Closed Loop Gain eN Total Input Noise VCCTOT MAX Min. ±10 VS Iq 3.5 29 A Curve f = 20Hz to 22KHz e t le Maximum Total VCC Protection Input Resistance Ri SVR Supply Voltage Rejection Tr, Tf Rising and Falling Time RDSON FSW-OP FSW BF RF so f = 100Hz; Vr = 0.5 Power Transistor on Resistance Switching Frequency Operative Range Switching Frequency Zero Signal Frequency Constant (***) (s) b O - t c u Frequency Controller Resistor Range (****) MUTE & STAND-BY FUNCTIONS VST-BY d o r P e od 30 Pr 31 20 46 °C dB 7 12 µV µV V 30 kΩ 60 dB 50 ns 0.4 100 200 Ω KHz 100 120 1.4x109 140 KHz HzΩ 7 12 14 KΩ Stand-by range t e l o ) s t( 50 VMUTE VPLAY Mute Range Play Range (1) 1.8 4 AMUTE Mute Attenuation 60 IqST-BY Quiescent Current @ Stand-by s b O uc 150 V 0.8 V 2.5 V V 5 mA 80 3 dB *: The output LC filter must be changed to: L = 30µH; C = 1µF **: 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 10KΩ is to be considered 3/6 TDA7481 Figure 2: Recommended P.C. Board and Component Layout of the Circuit of Figure 1 (1.25:1 scale) c u d o s b O - Note: Capacitor C5 must be as close as possible to device’s pins 16 and 17 ) s ( ct u d o r P e t e l o s b O 4/6 e t le o r P ) s t( TDA7481 mm DIM. MIN. TYP. inch MAX. MIN. TYP. A5 OUTLINE AND MECHANICAL DATA MAX. 0.197 B 2.65 C 0.104 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 0.87 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 4.73 5.08 5.43 0.186 0.200 0.214 S 1.9 2.6 0.075 0.102 c u d 0.114 S1 1.9 2.6 0.075 0.102 Dia1 3.65 3.85 0.144 0.152 ) s ( ct ) s t( o r P Multiwatt15 (Vertical) e t le o s b O - u d o r P e t e l o s b O 0016036 J 5/6 TDA7481 c u d e t le ) s ( ct ) s t( o r P o s b O - u d o r P e t e l o s b O 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. 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