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10W MONO CLASS D AMPLIFIER
®
TDA7480
10W MONO CLASS-D AMPLIFIER
10W OUTPUT POWER:
R
L
= 8
W
/4
W
; THD = 10%
HIGH EFFICIENCY
NO HEATSINK
SPLIT SUPPLY
OVERVOLTAGE PROTECTION
ST-BY AND MUTE FEATURES
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
PDIP20
(14+3+3)
DESCRIPTION
The TDA7480 is an audio class-D amplifier as-
sembled in Power DIP package specially de-
signed for high efficiency applications mainly for
TV and Home Stereo sets.
ORDERING NUMBER:
TDA7480
Figure 1:
Test and Application Circuit.
+5
V
+V
C
C
R1
10K
C5 100nF
R2
7K
-VCC
(Pin 17)
C6
100nF
C7
2200
m
F
R3
30K
N.
C
.
V
CC POW
V
CC SIGN
ST-BY
MUTE
12
7,13
16
14
C1
2.2
m
F
ST-BY/
MUTE
6
BOOT
IN1
11
C11
100nF
IN1
-
PRE
PWM
4
L1 60
m
H
+
C2 0.33
m
F
C3
1nF
+
OUT
C12
560pF
R5
150
C4 4.7nF
8
C14
470nF
8
W
FEEDCAP
W
BOOTDIODE
5
SGN-GND
10
15
9
1,2,3,1
8
,19,20
1
7
VREG
C15
100nF
FREQ
-V
CC
-V
CC
C8
270pF
R4 12K
W
RF
-VCC
-VCC
C9
100nF
C10
2200
m
F
D96AU536E
September 1998
1/10
TDA7480
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
CC
DC Supply Voltage
±
20
V
T
stg
, T
j
Storage and Junction Temperature
–40 to 150
°C
V
FREQ
Maximum Voltage Across VFREQ (Pin 9)
8
V
T
op
Operating Temperature Range
-20 to 70
°C
ESD
Maximum ESD on Pins
±
1.8
kV
PIN CONNECTION
(Top view)
Rth with "on board" Square Heatsink vs. cop-
per area.
-V
CC
1
20
19
18
17
16
-V
CC
R
thj-a
(˚C/W)
D97AU675
COPPER AREA 35
m
THICKNESS
-V
CC
-V
CC
2
-V
CC
3
-V
CC
60
OUT
BOOTDIODE
4
5
6
7
8
9
-V
CC
+V
CC POW
VREG
BOOT
15
50
PC BOARD
N.C.
14
+V
CC SIGN
FEEDCAP
FREQ
13
12
N.C.
STBY/MUTE
40
SGN-GND
10
11
IN
D96AU537B
30
0
4
8
12
Area(cm
2
)
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th j-amb
Thermal Resistance Junction to ambient
80
°C/W
R
th j-pin
Thermal Resistance Junction to Pin Max.
12
°C/W
PIN FUNCTIONS
N.
Name
Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
-V
CC
-V
CC
-V
CC
OUT
BOOTDIODE
BOOT
NC
FEEDCAP
FREQUENCY
SGN-GND
IN
ST-BY-MUTE
NC
+V
CC
SIGN
VREG
+V
CC
POW
-V
CC
-V
CC
-V
CC
-V
CC
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
2/10
TDA7480
ELECTRICAL CHARACTERISTICS
(Refer to the test circuit, V
CC
=
±
14V; 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
±
16
V
I
q
Total Quiescent Current
R
L
=
¥
; NO LC Filter
25
40
mA
V
OS
Output Offset Voltage
Play Condition
–50
+50
mV
P
O
Output Power
THD = 10%
THD = 1%
8.5
6
10
7
W
W
R
L
= 4
W
V
CC
=
±
10.5V
THD = 10%
THD = 1%
10
7
W
W
P
d
(*)
Dissipated Power at 1W Output
Power
R
f
= 12K
W
P
O
= 1W
1
W
P
DMAX
Maximum Dissipated Power
P
O
= 10W THD 10%
R
th-j-amb
= 38°C/W (Area 12cm
2
)
1.8
W
h
P
O
P
O
P
O
THD 10%
R
th-j-amb
= 38°C/W (Area 12cm
2
)
80
85
%
Efficiency
º
P
D
º
P
I
(**)
+
THD
Total Harmonic Distortion
R
L
= 8
W
; P
O
= 0.5W
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
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
Switching Frequency
100
120
140
KHz
F
SW_OP
Switching Frequency Operative
Range
100
200
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
*: 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.
**: P
O
= measured across the load using the following inductor:
COIL 58120 MPPA2 (magnetics) TURNS: 28
Æ
1mm
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 V
12
>5.2V, an input impedance of 10K
m
(magnetics) TURNS: 28
Æ
W
is to be considered.
3/10
COIL77120 KOOL M
TDA7480
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
4/10
TDA7480
Figure 3:
Stereo Application in Single Supply.
R1 10K
-VCC
(Pin 17)
(*) +5V
R3
30K
R2
10K
C5 100nF
+
V
S
C1
2.2
m
F
MUTE ST-BY
L2 1
m
H
C6
100nF
C7
47
m
F/50VI
R6
1K/2W
C29
2200
m
F/
50VI
C30
2200
m
F/
50VI
N.
C
.
V
CC
C10
SGN-GND
7,13
14,16
6
BOOT
C11
100nF
47
m
F/50VI
R7
1K/2W
10
4
L1 60
m
H
OU
T
R
ST-BY/MUTE
MUTE/
ST-BY
12
OUT
TDA7480
LEFT
C12
560pF
R5
150
W
C2 0.33
m
F
OUT
LEFT
IN
11
C14
470nF
IN LEFT
C3
1nF
L3 1
m
H
C4 4.7nF
5
PGND
BOOTDIODE
8
1,2,3,17,
18,1
9
,20
-V
CC SIGN
FEEDCAP
15
9
VREG
FREQ
C15
100nF
C8
270pF
R4
12K
W
L4 1
m
H
C19 100nF
C9
100nF
L6 1
m
H
C20
100nF
C21
47
m
F/50VI
N.
C
.
V
CC
C23
7,13
14,16
47
m
F/50VI
SGN-GND
6
BOOT
C25
100nF
10
4
L5 60
m
H
OU
T
R
ST-BY/MUTE
MUTE/
ST-BY
12
OUT
C26
560pF
R9
150
W
C16 0.33
m
F
TDA7480
RIGHT
OUT
RIGHT
IN
11
C28
470nF
IN RIGHT
C17
1nF
L7 1
m
H
C18 4.7nF
5
PGND
BOOTDIODE
8
1,2,3,17,
18,1
9
,20
-V
CC SIGN
FEEDCAP
15
9
VREG
FREQ
C27
100nF
C24
270pF
R8
12K
W
L8 1
m
H
(*) +5V Referred to V
CC
/2
C22
100nF
D97AU815C
5/10
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