STMICROELECTRONICS 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
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.
ORDERING NUMBER: TDA7481
Figure 1: Test and Application Circuit.
+5V
+VCC
R1
10K
R2
10K
ST-BY
MUTE
C1
2.2
µF
C5 100nF
-VCC
(Pin 14,15)
R3
30K
ST-BY/
MUTE
IN1
IN1
C2 0.33µF
C4 4.7nF
VCC POW
N.C.
10
C6
100nF
4
C7
2200µF
VCC SIGN
13
11
3
9
+
C3
1nF
C11
100nF
1
-
PRE
BOOT
PWM
+
OUT
5
FEEDCAP
12
SGN-GND
7
6
8
D96AU534C
February 1998
14,15
-VCC SIGN
C14
470nF
8Ω
VREG
C15
100nF
2
FREQ
C8
270pF
C12
560pF
R5
150Ω
L1 60µH
BOOTDIODE
-VCC POW
R4 12KΩ
(RF)
-VCC
C9
100nF
C10
2200µF
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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)
TAB CONNECTED TO PIN 8
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
4
N.C.
3
BOOT
2
BOOTDIODE
1
OUT
D96AU535A
THERMAL DATA
Symbol
Rth j-case
Parameter
Thermal Resistance Junction-case
Typ.
Max.
Unit
1.8
2.5
°C/W
PIN FUNCTIONS
2/6
N.
Name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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)
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
150
°C
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% (*)
PD
η
THD
Imax
Total Quiescent Current
Maximum Dissipated Power
Efficiency ≡
PO
PO
(**)
≡
PO + PD PI
Total Harmonic Distortion
Overcurrent Protection
Threshold
Tj
Thermal Shut-down Junction
Temperature
GV
Closed Loop Gain
eN
Total Input Noise
VCCTOT MAX
Ri
Min.
±10
VS
Iq
RL = ∞, no LC filter
RL = 8Ω; PO = 1W
RL = 0
3.5
29
A Curve
f = 20Hz to 22KHz
Maximum Total VCC Protection
50
Input Resistance
20
31
dB
7
12
µV
µV
V
30
kΩ
SVR
Supply Voltage Rejection
60
dB
Tr, Tf
Rising and Falling Time
50
ns
Power Transistor on Resistance
Switching Frequency Operative
Range
0.4
RDSON
FSW-OP
FSW
BF
RF
f = 100Hz; Vr = 0.5
30
V
Switching Frequency
Zero Signal Frequency
Constant (***)
Frequency Controller Resistor
Range (****)
MUTE & STAND-BY FUNCTIONS
46
100
200
Ω
KHz
100
120
1.4x109
140
KHz
HzΩ
7
12
14
KΩ
VST-BY
Stand-by range
VMUTE
VPLAY
Mute Range
Play Range (1)
1.8
4
AMUTE
Mute Attenuation
60
IqST-BY
Quiescent Current @ Stand-by
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
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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.
MIN.
mm
TYP.
MAX.
MIN.
inch
TYP.
MAX.
A
5
0.197
B
2.65
0.104
C
1.6
0.063
D
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
0.870
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
L7
2.65
2.9
0.104
M
4.25
4.55
4.85
0.167
0.179
0.191
M1
4.63
5.08
5.53
0.182
0.200
0.218
S
1.9
2.6
0.075
0.102
S1
1.9
2.6
0.075
0.102
Dia1
3.65
3.85
0.144
0.152
0.713
0.114
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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.
© 1998 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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