STMICROELECTRONICS TDA7482

TDA7482

25W MONO CLASS-D AMPLIFIER
25W 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 TDA7482 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: TDA7482
Figure 1: Test and Application circuit.
+5V
+VCC
R1
10K
C5 100nF
-VCC
(Pin 14,15)
R2
10K
ST-BY
MUTE
C1
2.2
µF
R3
30K
ST-BY/
MUTE
IN1
IN1
C2 0.33µF
C4 4.7nF
VCC SIGN
VCC POW
N.C.
10
C7
2200µF
C6
100nF
13
4
11
3
9
BOOT
C11
100nF
-
PRE
+
C3
1nF
1
PWM
+
OUT
5
FEEDCAP
12
SGN-GND
6
8
FREQ
D96AU538C
June 1998
14,15
L1 60µH
C14
470nF
8Ω
VREG
C15
100nF
2
7
C8
270pF
C12
560pF
R5
150Ω
BOOTDIODE
-VCC POW
-VCC SIGN
R4 12KΩ
(RF)
-VCC
C9
100nF
C10
2200µF
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TDA7482
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VCC
DC Supply Voltage
±28
V
Ptot
Power Dissipation Tcase = 70°C
35
W
Tstg, Tj
Storage and Junction Temperature
–40 to 150
°C
VFREQ
Maximum Voltage Across RF (pin6)
8
V
Operating Temperature Range
Top
ESD
0 to 70
°C
±1.2
KV
Max ESD on Pins
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
D96AU539A
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)
TDA7482
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VCC = ±21V; RL = 8Ω; RS = 50Ω;
RF = 12KΩ; Demod.. filter L = 60µH, C = 470nF; f = 1KHz; Tamb = 25°‘C unless otherwise specified.)
Symbol
Parameter
VS
Supply Range
Iq
Total Quiescent Current
Test Condition
Min.
Typ.
Max.
Unit
40
±25
60
mA
10
mV
±10
R L = ∞, No LC Filter
V
VOS
Output Offset Voltage
Play Condition
–70
-30
PO
Output Power
THD = 10%
THD = 1%
20
14
25
18
W
W
PO
Output Power
R L = 4Ω ; VCC = ±16V;
THD = 10%
THD = 1% (*)
25
18
W
W
VCC =±21V; R L = 8Ω;
PΟ = 25W THD 10%
3.8
W
VCC = ±21V; RL = 8Ω;
PΟ = 18W THD 10%
87
%
VCC = ±25V; RL = 8Ω;
PΟ = 43W THD 20%
88.5
%
0.1
%
5
A
150
°C
PD
η
ηmax
Maximum Dissipated Power
Efficiency ≡
PO
PO
≡
(**)
PO + PD PI
Top Efficiency maximum
THD
Total Harmonic Distortion
R L = 8Ω; PO = 1W
Imax
Overcurrent Protection
Threshold
RL = 0
Tj
Thermal Shut-down Junction
Temperature
GV
Closed Loop Gain
eN
Total Input Noise
VCCTOT MAX
Ri
3.5
29
A Curve
f = 20Hz to 22KHz
30
dB
µV
µV
Maximum Total VCC Protection
50
Input Resistance
20
30
kΩ
46
60
dB
ns
SVR
Supply Voltage Rejection
f = 100Hz; Vr = 0.5
V
T r, T f
Rising and Falling Time
50
R DSON
Power Transistor on Resistance
0.4
FSW-OP
Switching Frequency Operative
Range
100
Switching Frequency
100
FSW
31
7
12
Ω
200
120
140
1.4x109
BF
Zero Signal Frequency
Constant (***)
RF
Frequency Controller Resistor
Range (****)
7
12
KHz
KHz
HzΩ
14
KΩ
0.8
V
MUTE & STAND-BY FUNCTIONS
VST-BY
Stand-by range
VMUTE
Mute Range
VPLAY
Play Range (1)
4
AMUTE
Mute Attenuation
60
IqST-BY
Quiescent Current @ Stand-by
1.8
2.5
V
V
80
3
dB
5
mA
*: 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: FSW = BF/RF
****: 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
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TDA7482
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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TDA7482
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
0.713
0.114
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
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TDA7482
Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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 1998 STMicroelectronics – Printed in Italy – All Rights Reserved
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