TDA8002CG/C1,518

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Interface - Specialized is an important application field for the TDA8002CG/C1,518. This half-bridge switching mode IC is part of a Class D amplifier targeted for car audio application to address the needs of increased dynamism for high-end car audio systems. The processing of audio signals requires special ICs to provide lots of power with minimum distortion and low thermal dissipation. The high-side and low-side MOSFET transistors are driven by a current mirror circuit and a single power supply up to ±25V. This reduces the board space requirement. On-chip EMI filters and other protection functions like soft start, short-circuit, over current, and overtemperature protections enhance the reliability of the system. The output protection can ensure the amplifier can survive any fault conditions such as speakers overloading. The low switching frequency of 200 KHz provides improved linearity and eliminates the need for a large LC filter in the power supply.

The TDA8002CG/C1,518 has several inputs and outputs including a pulse-width modulated (PWM) input and outputs for the high and low side MOSFETs. The MOSFETs are the crucial components for Class D amplifiers, allowing the amplifier to switch on and off rapidly, switching only when required. The maximum output power of the amplifier is highly dependent on the MOSFETs and their technology. With the TDA8002CG/C1,518, the load current up to ±600 mA can effortlessly provide more than 100Wrms power at a wide audio frequency range with low distortion and heat generation.

The working principle of the TDA8002CG/C1,518 is based on the modulation of the output current with a pulse width modulation (PWM) signal. The incoming audio signal is filtered to remove any DC component and amplified to reach the reference level, which is typically a voltage of 3 or 5 V. This voltage is then compared to the input audio signal and sent to a comparator. If the input voltage is higher than the reference voltage, the output of the comparator will be high and the MOSFET will be turned on, thus allowing current flow between the power supply and the load. Conversely, if the input voltage is lower than the reference voltage, the comparator output will be low and the MOSFET will be turned off, thus preventing current flow. By means of pulse width modulation, the flow of current through the load can be controlled.

The TDA8002CG/C1,518 also has an on-board power-down mode with a current consumption lower than 1uA. This allows the amplifier to enter a stand-by mode whenever the audio signal drops below a certain threshold. This feature is particularly useful for applications such as car audio systems, where the amplifiers can be powered down when no audio is detected, thereby saving energy.

The TDA8002CG/C1,518 is an ideal choice for high-end car audio systems and other audio applications requiring power amplification with low distortion and superior reliability. With its integrated MOSFETs and other protection functions, the TDA8002CG/C1,518 is a solution for any designer seeking an efficient Class D amplifier for a variety of interface applications.

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