®
TDA7481
18W MONO CLASS-D AMPLIFIER
18W OUTPUT POWER:
R
L
= 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
DESCRIPTION
The TDA7481 is an audio class-D amplifier as-
sembled in Multiwatt15 package specially de-
signed 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
R3
30K
C1
2.2
µF
IN1
bs
O
l
o
C2 0.33µF
C4 4.7nF
te
e
ro
P
ST-BY/
MUTE
IN1
C3
1nF
FEEDCAP
SGN-GND
10
uc
d
N.C.
4
-VCC
(Pin 14,15)
s)
t(
C5 100nF
V
CC POW
13
-
+
PRE
so
b
-O
+VCC
C6
100nF
V
CC SIGN
11
P
te
le
C7
2200µF
od
r
s)
t(
uc
3
BOOT
C11
100nF
OUT
C12
560pF
R5
150Ω
L1 60µH
9
-
+
PWM
1
5
C14
470nF
8Ω
12
2
6
FREQ
C8
270pF
R4 12KΩ
(R
F
)
C9
100nF
-VCC
8
-V
CC SIGN
14,15
-V
CC POW
VREG
C15
100nF
BOOTDIODE
7
D96AU534C
C10
2200µF
September 2003
1/6
TDA7481
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
P
tot
T
stg
, T
j
V
FREQ
T
op
ESD
DC Supply Voltage
Power Dissipation T
case
= 70°C
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
-V
CC POW
-V
CC POW
+V
CC POW
VREG
+V
CC SIGN
ST-BY/MUTE
IN
-V
CC SIGN
SGN-GND
FREQ
TAB CONNECTED TO PIN 8
THERMAL DATA
Symbol
R
th j-case
Thermal Resistance Junction-case
PIN FUNCTIONS
N.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
bs
O
l
o
OUT
BOOTDIODE
BOOT
NC
FEEDCAP
FREQ
SGN-GND
–V
CC
SIGN
IN
ST-BY/MUTE
+V
CC
SIGN
VREG
+V
CC
POW
-V
CC
POW
-V
CC
POW
te
e
Name
ro
P
uc
d
Parameter
s)
t(
b
-O
so
P
te
le
FEEDCAP
N.C.
BOOT
BOOTDIODE
OUT
od
r
s)
t(
uc
D96AU535A
Typ.
1.8
Max.
2.5
Unit
°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)
2/6
TDA7481
ELECTRICAL CHARACTERISTICS
(Refer to the test circuit, V
CC
=
±18V;
R
L
= 8Ω; R
S
= 50Ω;
R
F
= 12KΩ; Demod.. filter L = 60µH, C = 470nF; f = 1KHz; T
amb
= 25°‘C unless otherwise specified.)
Symbol
V
S
I
q
V
OS
P
O
P
O
Parameter
Supply Range
Total Quiescent Current
Output Offset Voltage
Output Power
Output Power
Test Condition
R
L
=
∞,
no LC filter
PLAY condition
THD = 10%
THD = 1%
V
CC
=
±15V;
R
L
= 4Ω
THD = 10%
THD = 1% (*)
V
CC
=
±18V;
R
L
= 8Ω; R
f
= 12KΩ
P
Ο
= 18W THD 10%
V
CC
=
±18V;
R
L
= 8Ω; R
f
= 12KΩ
P
Ο
= 18W THD 10%
R
L
= 8Ω; P
O
= 1W
R
L
= 0
–70
15
10
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
%
P
D
η
Maximum Dissipated Power
P
O
P
O
(**)
Efficiency
≡
≡
P
O
+
P
D
P
I
Total Harmonic Distortion
Overcurrent Protection
Threshold
Thermal Shut-down Junction
Temperature
Closed Loop Gain
Total Input Noise
Maximum Total V
CC
Protection
Input Resistance
Supply Voltage Rejection
Rising and Falling Time
Power Transistor on Resistance
Switching Frequency Operative
Range
Switching Frequency
Zero Signal Frequency
Constant (***)
THD
I
max
T
j
G
V
e
N
V
CCTOT MAX
R
i
SVR
T
r
, T
f
R
DSON
F
SW-OP
F
SW
B
F
R
F
3.5
0.1
5
150
29
A Curve
f = 20Hz to 22KHz
f = 100Hz; V
r
= 0.5
Frequency Controller Resistor
Range (****)
MUTE & STAND-BY FUNCTIONS
V
ST-BY
V
MUTE
V
PLAY
O
*: The output LC filter must be changed to: L = 30µH; C = 1µF
so
b
A
MUTE
I
qST-BY
te
le
Stand-by range
Mute Range
Play Range (1)
ro
P
uc
d
s)
t(
so
b
-O
te
le
50
46
r
P
od
30
7
12
30
60
50
0.4
s)
t(
uc
°C
31
%
A
dB
µV
µV
V
dB
ns
20
kΩ
100
100
120
1.4x10
9
12
200
140
Ω
KHz
KHz
HzΩ
KΩ
7
14
0.8
1.8
4
60
80
3
5
2.5
V
V
V
dB
mA
Mute Attenuation
Quiescent Current @ Stand-by
**: P
O
= 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
= B
F
/R
F
****: The maximum value of R
F
is related to the maximum possible value for the voltage drop on R
F
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)
Note: Capacitor C5 must be as close as possible to device’s pins 16 and 17
O
so
b
te
le
ro
P
uc
d
s)
t(
so
b
-O
P
te
le
od
r
s)
t(
uc
4/6
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