25W MONO CLASS-D AMPLIFIER
25W OUTPUT POWER:
R
=8Ω/4Ω; THD = 10%
L
HIGHEFFICIENCY
WIDE SUPPLY VOLTAGE RANGE (UP TO
25V)
±
SPLIT SUPPLY
OVERVOLTAGEPROTECTION
ST-BYAND MUTE FEATURES
SHORTCIRCUITPROTECTION
THERMALOVERLOAD PROTECTION
TDA7482
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.
Figure 1:
Test and Applicationcircuit.
+5V
R1
10K
R3
R2
30K
10K
MUTEST-BY 10
IN1
C2 0.33µF
C4 4.7nF
D96AU538C
C1
2.2
µF
ST-BY/
MUTE
IN1
C3
1nF
FEEDCAP
SGN-GND
C8
270pF
9
5
7
C5 100nF
-VCC
(Pin 14,15)
V
N.C.
6 8 14,15
FREQ -V
R4 12KΩ
(RF) -VCC
CC POW
-
PRE
+
13 11
4
-V
+VCC
CC SIGN
V
CC SIGN
100nF
C6
100nF
-
PWM
+
C9
ORDERING NUMBER: TDA7482
C7
2200µF
BOOT
3
C11
100nF
C12
560pF
R5
150Ω
L1 60µH
C14
470nF
C15
100nF
CC POW
1
12
2
OUT
VREG
BOOTDIODE
C10
2200µF
8Ω
June 1998
1/6
TDA7482
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
CC
P
tot
T
stg,Tj
V
FREQ
T
op
ESD Max ESD on Pins ±1.2 KV
DC Supply Voltage ±28 V
Power Dissipation T
=70°C35W
case
Storage and Junction Temperature –40 to 150 °C
Maximum Voltage Across RF (pin6) 8 V
Operating Temperature Range 0 to 70 °C
PIN CONNECTION
(Topview)
TAB CONNECTED TO PIN 8
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
D96AU539A
-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
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
2/6
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)
TDA7482
ELECTRICALCHARACTERISTICS (Referto the test circuit, VCC=±21V;RL=8Ω;RS=50Ω;
=12KΩ; Demod.. filter L = 60µH, C= 470nF;f = 1KHz; T
R
F
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
S
I
q
V
OS
P
O
Supply Range
Total Quiescent Current RL=∞, No LC Filter 40 60 mA
Output Offset Voltage PlayCondition –70 -30 10 mV
Output Power THD = 10%
THD = 1%
P
O
Output Power RL=4Ω;VCC=±16V;
THD = 10%
THD = 1% (*)
P
D
η
η
max
THD Total Harmonic Distortion R
I
max
Maximum Dissipated Power VCC=±21V; RL=8Ω;
P
= 25W THD 10%
Ο
=±21V; RL=8
V
Efficiency ≡
P
O
PO+ P
P
O
≡
(**)
P
D
I
CC
P
= 18W THD 10%
Ο
Top Efficiency maximum VCC=±25V; RL=8
= 43W THD 20%
P
Ο
=8Ω;PO= 1W 0.1 %
L
Overcurrent Protection
RL= 0 3.5 5 A
Threshold
T
j
Thermal Shut-down Junction
Temperature
G
V
e
N
Closed Loop Gain 29 30 31 dB
Total Input Noise A Curve
f = 20Hz to 22KHz
V
CCTOTMAX
R
SVR Supply Voltage Rejection f= 100Hz; V
T
r,Tf
R
DSON
F
SW-OP
Maximum Total VCCProtection 50 V
Input Resistance 20 30 kΩ
i
= 0.5 46 60 dB
r
Rising and Falling Time 50 ns
Power Transistor on Resistance 0.4
Switching Frequency Operative
Range
F
SW
B
F
Switching Frequency 100 120 140 KHz
Zero Signal Frequency
Constant (***)
R
F
Frequency Controller Resistor
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
= measured across the load using the following inductor:
**: P
O
COIL 58120 MPPA2 (magnetics) TURNS:28
***: The zero-signal switching frequency can beobtained using the following expression: F
****: The maximum value of RFis related to the maximum possible value for the voltage drop on RFitself
(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
∅ 1mm
=25°‘C unless otherwise specified.)
amb
10
±
20
14
25
18
25
18
3.8 W
Ω;
Ω;
87 %
88.5 %
150 °C
7
12
100 200 KHz
9
1.4x10
71214KΩ
SW=BF/RF
25 V
±
Hz
W
W
W
W
V
µ
V
µ
Ω
Ω
3/6
TDA7482
Figure 2:
RecommendedP.C. Board and Component Layout of the Circuit of Figure 1 (1.25:1scale)
Note: Capacitor C5 must be as close as possible to device’s pins 16 and 17
4/6
MULTIWATT15 PACKAGE MECHANICAL DATA
TDA7482
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
5/6
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 ofSTMicroelectronics.
The ST logo isa trademark of STMicroelectronics
1998 STMicroelectronics– Printed in Italy – All Rights Reserved
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