18W MONO CLASS-D AMPLIFIER
18W OUT P UT POWER:
R
= 8Ω/4Ω; THD = 10%
L
HIGH EFFICIENCY
WIDE SUPPLY VOLTAGE RANGE (UP TO
25V)
±
SPLIT SU PPLY
OVER VO LT AGE PROT E C T ION
ST-BY AND MUTE F EA T U RES
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
TDA7481
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.
Figure 1: Test and Application Circuit.
+5V
R1
10K
R2
R3
10K
30K
MUTEST-BY 10
IN1
C2 0.33µF
C4 4.7nF
D96AU534C
C1
2.2
µF
ST-BY/
MUTE
C3
1nF
FEEDCAP
SGN-GND
270pF
9
IN1
5
7
6 8 14,15
C8
C5 100nF
-VCC
(Pin 14,15)
V
N.C.
FREQ -V
R4 12KΩ
(R
CC POW
-
PRE
+
13 11
4
)
F
+VCC
-V
V
CC SIGN
100nF
CC SIGN
-
PWM
+
C9
100nF
ORDERING NUMBER:
C6
3
1
12
2
CC POW
-VCC
C7
2200µF
BOOT
OUT
VREG
BOOTDIODE
C10
2200µF
C11
100nF
C12
560pF
R5
150Ω
TDA7481
L1 60µH
C14
470nF
C15
100nF
8Ω
February 1998
1/6
TDA7481
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
DC Supply Voltage
Power Dissipation T
Storage and Junction Temperature –40 to 150 °C
j
Maximum Voltage Across RF (pin 6) 8 V
Operating Temperature Range 0 to 70 °C
T
V
V
CC
P
tot
stg
FREQ
T
op
, T
ESD Max ESD On Pins
PIN CONNECTION (Top view)
= 70°C 35 W
case
25 V
±
1.2 KV
±
D96AU535A
-V
CC POW
-V
CC POW
+V
CC POW
VREG
+V
CC SIGN
ST-BY/MUTE
IN
-V
CC SIGN
SGN-GND
FREQ
FEEDCAP
N.C.
BOOT
BOOTDIODE
OUT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
TAB CONNECTED TO PIN 8
THERMAL DATA
Symbol Parameter Typ. Max. Unit
R
th j-case
Thermal Resistance Junction-case 1.8 2.5 °C/W
PIN FUNCTIONS
N. Name Function
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
OUT
BOOTDIODE
BOOT
NC
FEEDCAP
FREQ
SGN-GND
–V
SIGN
CC
IN
ST-BY/MUTE
+V
SIGN
CC
VREG
+V
POW
CC
-V
POW
CC
-V
POW
CC
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)
2/6
TDA7481
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, V
F
= 12KΩ; Demod.. filter L = 60µH, C = 470nF; f = 1KHz; T
R
= ±18V; RL = 8Ω; RS = 50Ω;
CC
= 25°‘C unless otherwise specified.)
amb
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
S
I
q
V
OS
P
O
P
O
P
D
η
Supply Range
Total Quiescent Current RL = ∞, no LC filter 35 55 mA
Output Offset Voltage PLAY condition –70 -30 10 mV
Output Power THD = 10%
Output Power VCC = ±15V; RL = 4Ω
Maximum Dissipated Power VCC = ±18V; RL = 8
Efficiency ≡
P
P
O
P
P
O
≡
(**)
P
D
I
O
+
THD Total Harmonic Distortion R
I
max
Overcurrent Protection
THD = 1%
THD = 10%
THD = 1% (*)
Rf = 12K
P
= 18W THD 10%
Ο
= ±18V; RL = 8
V
CC
P
= 18W THD 10%
Ο
= 8Ω; PO = 1W 0.1 %
L
Ω;
Rf = 12K
Ω;
RL = 0 3.5 5 A
10
±
15
10
18
13
25 V
±
18
13
Ω
Ω
3.5 W
85 %
Threshold
T
Thermal Shut-down Junction
j
150 °C
Temperature
G
e
N
V
CCTOT MAX
R
SVR Supply Voltage Rejection f = 100Hz; V
Tr, T
R
DSON
F
SW-OP
Closed Loop Gain 29 30 31 dB
V
Total Input Noise A Curve
f = 20Hz to 22KHz
7
12
Maximum Total VCC Protection 50 V
Input Resistance 20 30 k
i
= 0.5 46 60 dB
r
Rising and Falling Time 50 ns
f
Power Transistor on Resistance 0.4
Switching Frequency Operative
100 200 KHz
Range
F
SW
B
F
Switching Frequency 100 120 140 KHz
Zero Signal Frequency
1.4x10
9
Constant (***)
R
F
Frequency Controller Resistor
71214K
Range (****)
MUTE & STAND-BY FUNCTIONS
V
ST-BY
V
MUTE
V
PLAY
A
MUTE
I
qST-BY
*: The output LC filter must be changed to: L = 30µH; C = 1µF
**: P
= measured across the load using the following inductor:
O
COIL 58120 MPPA2 (magnetics) TURNS: 28 ∅ 1mm
***: The zero-signal switching frequency can be obtained using the following expression: F
****: 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
Stand-by range 0.8 V
Mute Range 1.8 2.5 V
Play Range (1) 4 V
Mute Attenuation 60 80 dB
Quiescent Current @ Stand-by 3 5 mA
= BF/R
SW
F
W
W
W
W
V
µ
V
µ
Ω
Ω
Hz
Ω
Ω
3/6
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
4/6
MULTIWATT15 PACKAGE MECHANICAL DATA
TDA7481
DIM.
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 0.713
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 0.114
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
MIN. TYP. MAX. MIN. TYP. MAX.
mm inch
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TDA7481
Information furnis hed is believe d to be ac curate and reliabl e. However, SGS-THOMS ON Mi croelect ronics as sumes no res ponsib ility for the
consequences of use of such inf orm ation nor for any i nfringem ent of patents or other rights of third parti es 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 me ntioned
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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