[Photo] 4 × 22W power amplifier TDA7382


TDA7382 is a new type A and B audio power amplifier launched by ST Company, especially suitable for car receivers.
It uses a 25-pin Flexiwatt 25 package, the pin arrangement is shown in Figure 1. There is no need for external compensation and output bootstrap capacitors, and only a small amount of resistance-capacitance components can form a low-frequency power amplifier circuit as shown in FIG. 2.
The maximum power supply voltage cannot exceed 18V, and the quiescent current is about 150mA. C1 ~ C4 are the input capacitance of pins IN1 ~ IN4 respectively. When their values ​​are all selected as 0.1μF, the low frequency cut-off frequency of the amplifier is 16Hz. The functions of the {4} pin and the {22} pin are standby and squelch suppression (MUTE), if not used, they can be connected to the power supply Vs respectively. When the voltage on the {4} pin drops below the 1.5V threshold, the amplifier is turned off. When the {4} pin is low, the standby current of the amplifier is only about 20μA. As long as the voltage on the {22} pin drops to the threshold of 1.5V, the amplifier is in the squelch state. The C6 on the {10} pin is used for power supply voltage suppression (SVR), and the function of the {25} pin is limit detection.
TDA7382 has overheat limit, open circuit, electrostatic discharge (ESD) and short circuit protection functions, the maximum peak output current is 4.5A, the output offset voltage does not exceed 100mV, the typical value of THD is 0.04%, the output noise voltage The typical value of CN0 is 65μV. At VS = 14.4V, f = 1kHz and THD = 10% and RL = 4Ω, the output power of each channel is 22W.




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