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TDA7481
18W MONO CLASS D AMPLIFIER
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TDA7481
18W MONO CLASS-D AMPLIFIER
18W OUTPUT POWER:
RL = 89/49; THD = 10%
" HIGH EFFICIENCY
WIDE SUPPLY VOLTAGE RANGE (UP TO
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.
Multiwatt15
ORDERING NUMBER: TDA7481
Figure 1: Test and Application Circuit.
C5 100nF
I 2200WF
_-N/fic tr-ll -
(Pin14,15) C6 l
I 100nF I
NC. Vcc POW Vcc SIGN
'', 10 4 13 11
ST-BY MUTE
3 BOOT
IN1 o-l
C2 0.33%
C4 4.7nF
FEEDCAP
SGN-GND
' -L C11
100nF L1 60WH
6 8 14,,‘15 BOOTDIODE
FREQ A/cc SIGN -Vcc POW
C8 R4 12kft
270pF T (RF) A/CC
C9 J- J. C10
096AU5340 100nF I T 2200uF
February 1998
TDA7481
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
Vcc DC Supply Voltage :25 V
Ptot Power Dissipation Tease = 70°C 35 W
Tstg, T, Storage and Junction Temperature -40 to 150 "C
VFREQ Maximum Voltage Across RF (pin 6) 8 V
Top Operating Temperature Range 0 to 70 (
ESD Max ESD On Pins $1.2 KV
PIN CONNECTION (Top view)
A/cc POW
A/cc POW
+Vcc POW
+Vcc SIGN
ST-BY/MUTE
8 A/cc SIGN
7 SGN-GND
6 FREQ
5 FEEDCAP
()- 3 BOOT
2 BOOTDIODE
A TAB CONNECTED TO PIN 8 D96AU535A
THERMAL DATA
Symbol Parameter Typ. Max. Unit
Rm j-case Thermal Resistance Junction-case 1.8 2.5 "C/W
PIN FUNCTIONS
N. Name Function
1 OUT PWM OUTPUT
2 BOOTDIODE BOOTSTRAP DIODE ANODE
3 BOOT BOOTSTRAP
4 NC NOT CONNECTED
5 FEEDCAP FEEDBACK INTEGRATING CAPACITOR
6 FREQ SETTING FREQUENCY RESISTOR
7 SGN-GND SIGNAL GROUND
8 -1/cc SIGN SIGNAL NEGATIVE SUPPLY
9 IN INPUT
10 ST-BY/MUTE CONTROL STATE PIN
11 +Vcc SIGN POSITIVE SIGNAL SUPPLY
12 VREG INTERNAL VOLTAGE REGULATOR
13 +Vcc POW POSITIVE POWER SUPPLY
14 -Vcc POW NEGATIVE POWER SUPPLY (to be connected to pin 13 via CS)
15 -Vcc POW NEGATIVE POWER SUPPLY (to be connected to pin 13 via CS)
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