The Circuit present here is a 20Watts Car Stereo Amplifier. The main features of this powerful MULTIWATT® package (a trademark of SGS-THOMSON Microelectronics), a power amplifier IC chips designed specifically for car radio application, are the high current capability (3.5A) and the capability to drive a very low impedance (down to 1.6R). Here is the schematic diagram of the standard circuit as shown in its data sheet.
Technical Specification of TDA2004
The TDA2004A is a class B dual audio power amplifier in MULTIWATT[ package specifically designed for car radio applications
ABSOLUTE MAXIMUM RATINGS
VS Opearting Supply Voltage 18 V
VS DC Supply Voltage 28 V
VS Peak Supply Voltage (for 50ms) 40 V
IO (*) Output Peak Current (non repetitive t = 0.1ms) 4.5 A
IO (*) Output Peak Current (repetitive f . 10Hz) 3.5 A
Ptot Power Dissipation at Tcase = 60°C 30 W
Tj, Tstg Storage and Junction Temperature –40 to 150 °C
(*) The max. output current is internally limited.
TDA2004 has low noise, low distortion, and robust. The robustness is supported by its operation safety protection features: very inductive loads, load dump voltage surge, overheating, output AC-ground short, fortuitous open ground. Other important things is space and cost saving : very low external components counts, and very simple mounting system with no need for electrical isolation between the package and the heat sink because the heat contact metal of the package is already connected to ground. [The above circuit’s schematic diagram is taken from: SGS-THOMSON Microelectronic Data Sheet]