TDA8358J application circuit

The TDA8358J application circuit is designed for television signal processing. The input signals are connected to the TDA8358J at pins 1 and 2, where pin 1 receives a positive sawtooth voltage input and pin 2 receives a negative sawtooth voltage input. The internal circuitry includes a differential amplifier and a push-pull power amplifier, which generate an output that drives the deflection coil connected to pins 10 and 4. A resistor (RM) is placed in series with the deflection coil to provide feedback voltage through pin 12 (Rs). This configuration enhances the linear sawtooth output and expands the dynamic range of the sawtooth waveform. The output current can be adjusted by modifying the resistance values of RM and RCV, with a maximum output current limit of 3.2 A peak-to-peak.

The TDA8358J is a highly integrated circuit designed for television applications, particularly for horizontal and vertical deflection control. In this circuit, the positive and negative sawtooth voltages applied to pins 1 and 2, respectively, are critical for generating the necessary deflection signals. The differential amplifier within the TDA8358J processes these input signals, allowing for precise control over the output waveform.

The push-pull power amplifier configuration is essential for driving the deflection coil, which is responsible for the movement of the electron beam in CRT televisions. The output from the power amplifier is applied to the deflection coil connected to pins 10 and 4, facilitating the horizontal and vertical scanning of the display.

The resistor RM serves a dual purpose: it limits the current through the deflection coil and provides feedback to enhance the linearity of the sawtooth waveform. This feedback mechanism is crucial for maintaining the accuracy of the deflection signals, ensuring that the displayed image remains stable and free from distortion. The feedback voltage at pin 12 (Rs) is a vital component of this feedback loop, allowing for dynamic adjustments to the output characteristics.

To optimize performance, the values of RM and RCV can be adjusted to tailor the circuit's response to specific requirements. However, it is imperative to ensure that the output current remains below the specified limit of 3.2 A peak-to-peak to prevent damage to the circuit components and maintain reliable operation. Proper selection of these resistors will help achieve the desired output current while maximizing the dynamic range and linearity of the deflection signals, ultimately resulting in improved image quality on the display. As shown for the TDA8358J actual application circuit. Television signal processing circuit input signals are input TDA8358J Hill 1,2 feet, positive sawtooth voltage input pin 1 , pin 2 negative sawtooth voltage input. After an internal signal of the differential amplifier and push-pull power amplifier output is applied to the deflection 10,4 feet across the coil. RM resistor in series with the deflection coil, providing feedback voltage by Rs 12-pin input, the linear sawtooth output is improved, and expanded dynamic range with a sawtooth wave.

Adjusting the resistance RM and RCV can change the output current, the output current must not exceed 3.2Ap-p.