Document
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TDA7480
10W MONO CLASS-D AMPLIFIER
10W OUTPUT POWER: RL = 8Ω/4Ω; 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 0.33µF 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 2200µF
C1 2.2 µF
BOOT C11 100nF OUT C12 560pF R5 150Ω L1 60µH
IN1
11
+
PRE
+
PWM
4
C14 470nF
8Ω
BOOTDIODE SGN-GND 5 10 9 FREQ C8 270pF R4 12KΩ RF C9 100nF -VCC C10 2200µF 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 35µ 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 = 8Ω; RS = 50Ω; Rf = 12KΩ; Demod.. filter L = 60µH, C = 470nF; f = 1KHz; Tamb = 25°C 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 = 4Ω VCC = ±10.5V THD = 10% THD = 1% Pd (*) PDMAX η Dissipated Power at 1W Output Power Maximum Dissipated Power PO PO (**) ≡ PO + PD PI Rf = 12KΩ PΟ = 1W PΟ = 10W THD 10% Rth-j-amb = 38°C/W (Area 12cm2) THD 10% Rth-j-amb = 38°C/W (Area 12cm2) RL = 8Ω; 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 µV µV KΩ dB ns Ω KHz KHz HzΩ KΩ
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 Mµ (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 10KΩ is to be considered.
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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 2.2µF R2 10K MUTE ST-BY C6 100nF N.C. SGN-GND 7,13 10 VCC 14,16 6 BOOT C11 100nF OUT L1 60µH C12 560pF R5 150Ω 5 8 9 FREQ C8 270pF R4 12KΩ C9 100nF 1,2,3,17, 18,19,20 -VCC SIGN 15 BOOTDIODE VREG C15 100nF L4 1µH C14 470nF L3 1µH PGND C.