TDA7482 Typical Application Circuit

TDA7482 Typical Application Circuit

SGS-THOMSON has launched three monolithic Class D power amplifier ICs, namely TDA7480 (10W), TDA 7481C (18W) and TDA7482 (25W). This article takes the TDA7482 with the largest output power as an example.      TDA7482 is a Class D pulse width modulation monolithic power amplifier IC for audio. This series of ICs is mainly designed for high-efficiency applications such as the sound system of large-screen color TVs and home stereo equipment.      The main technical parameters of TDA7482 are:  (1) It has a rated output power of 25W. The working conditions are: RL = 4~8Ω, THD ≤ 10%. In fact, according to the recommended electrical parameters, when RL = 8Ω, Pout = 1W, its THD is only 0.1%.  (2) It has a very high output efficiency. When Vcc = ±21V, RL = 8Ω, Pout = 18W, the efficiency is 78%, so it only needs a very small heat sink to work, or even no heat sink.  (3) It has a wide operating voltage range. The recommended value is ±10V~±25V, which is very suitable for car battery power supply.  (4) It is equipped with an overcurrent protection device. When RL=0Ω, the protection action threshold is 3.5A ~ 5A.  (5) It is equipped with an overvoltage protection device, and the protection threshold is 50V.  (6) It has overheating overload protection, and the overheating shutdown temperature is 150℃.  (7) It has ST-BY and MUTE functions.  (8) The recommended pulse width modulation carrier operating frequency is 100kHz ~ 200kHz.  (9) The input noise (20Hz ~ 20kHz) is 7μF ~ 12μF.  (10) The input impedance is 30kΩ.  (11) The maximum power consumption is 3.8W.