tda7481, Ham- CB Radio, Karty katalogowe
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TDA7481
18W MONO CLASS-D AMPLIFIER
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 as-
sembled in Multiwatt15 package specially de-
signed for high efficiency applications mainly for
TV and Home Stereo sets.
ORDERING NUMBER:
TDA7481
Figure 1:
Test and Application Circuit.
+5V
+V
C
C
R1
10K
C5 100nF
R2
10K
-VCC
(Pin 14,15)
C6
100nF
C7
2200
R3
30K
m
F
N.
C
.
V
CC POW
V
CC SIGN
ST-BY
MUTE
10
4
13
11
C1
2.2
m
F
ST-BY/
MUTE
3
BOOT
IN1
9
C11
100nF
IN1
-
PRE
PWM
1
L
1 60
H
C2 0.33
m
F
C3
1nF
+
+
OUT
C12
560pF
R5
150
C4 4.7nF
5
C14
470nF
8
W
FEEDCAP
W
12
VR
E
G
SGN-GND
7
2
C15
100nF
6
8
14,
1
5
BOOTDIODE
FREQ
-V
CC SIGN
-V
CC POW
C8
270pF
R4 12K
W
(R
F
)
-VC
C
D96AU534C
C9
100nF
C10
2200
m
F
February 1998
1/6
18W OUTPUT POWER:
R
L
= 8
W
/4
W
; THD = 10%
HIGH EFFICIENCY
WIDE SUPPLY VOLTAGE RANGE (UP TO
±
m
TDA7481
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
CC
DC Supply Voltage
±
25
V
P
tot
Power Dissipation T
case
= 70°C
35
W
T
stg
, T
j
Storage and Junction Temperature
–40 to 150
°C
V
FREQ
Maximum Voltage Across RF (pin 6)
8
V
T
op
Operating Temperature Range
0 to 70
°C
ESD
Max ESD On Pins
±
1.2
KV
PIN CONNECTION
(Top view)
15
-V
CC POW
-V
CC POW
+V
CC POW
VREG
14
13
12
11
+V
CC SIGN
ST-BY/MUTE
IN
-V
CC SIGN
SGN-GND
FREQ
FEEDCAP
N.C.
BOOT
BOOTDIODE
OUT
10
9
8
7
6
5
4
3
2
1
TAB CONNECTED TO PIN 8
D96AU535A
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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
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
= 8
W
; R
S
= 50
W
;
R
F
= 12K
W
; Demod.. filter L = 60
m
H, C = 470nF; f = 1KHz; T
amb
= 25°‘C unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Supply Range
±
10
±
25
V
I
q
Total Quiescent Current
R
L
=
¥
, no LC filter
35
55
mA
V
OS
Output Offset Voltage
PLAY condition
–70
-30
10
mV
P
O
Output Power
THD = 10%
THD = 1%
15
10
18
13
W
W
P
O
Output Power
V
CC
=
±
15V; R
L
= 4
W
THD = 10%
THD = 1% (*)
18
13
W
W
P
D
Maximum Dissipated Power
V
CC
=
±
18V; R
L
= 8
W;
R
f
= 12K
W
3.5
W
P
O
= 18W THD 10%
h
P
O
+
P
D
º
P
O
P
O
V
CC
=
±
18V; R
L
= 8
W;
R
f
= 12K
W
85
%
Efficiency
º
P
I
(**)
P
O
= 18W THD 10%
THD
Total Harmonic Distortion
R
L
= 8
W
; P
O
= 1W
0.1
%
I
max
Overcurrent Protection
Threshold
R
L
= 0
3.5
5
A
T
j
Thermal Shut-down Junction
Temperature
150
°C
G
V
Closed Loop Gain
29
30
31
dB
e
N
Total Input Noise
A Curve
f = 20Hz to 22KHz
7
12
m
V
m
V
V
CCTOT MAX
Maximum Total V
CC
Protection
50
V
R
i
Input Resistance
20
30
k
W
SVR
Supply Voltage Rejection
f = 100Hz; V
r
= 0.5
46
60
dB
T
r
, T
f
Rising and Falling Time
50
ns
R
DSON
Power Transistor on Resistance
0.4
W
F
SW-OP
Switching Frequency Operative
Range
100
200
KHz
F
SW
Switching Frequency
100
120
140
KHz
B
F
Zero Signal Frequency
Constant (***)
1.4x10
9
Hz
W
R
F
Frequency Controller Resistor
Range (****)
7
12
14
K
W
MUTE & STAND-BY FUNCTIONS
V
ST-BY
Stand-by range
0.8
V
V
MUTE
Mute Range
1.8
2.5
V
V
PLAY
Play Range (1)
4
V
A
MUTE
Mute Attenuation
60
80
dB
I
qST-BY
Quiescent Current @ Stand-by
3
5
mA
F
**: P
O
= measured across the load using the following inductor:
COIL 58120 MPPA2 (magnetics) TURNS: 28
m
H; C = 1
m
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 10K
Æ
W
is to be considered
3/6
*: The output LC filter must be changed to: L = 30
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
TDA7481
MULTIWATT15 PACKAGE MECHANICAL DATA
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
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
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
5/6
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