NCP2809BDMR2G Integrated Circuits (ICs)

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The NCP2809BDMR2G device belongs to the Audio Linear Amplifiers range of specialty products from ON Semiconductor. It is a high-side driver that is designed for automotive audio systems applications, specifically in the area of low operating current in audio power amplifiers. It is an ideal replacement for traditionally complex and costly discrete designs for automotive audio applications, as it supports a wide range of audio output current level up to 1A and its robust performance makes it useful for low-level audio protection.

Features of the NCP2809BDMR2G

• Wide range of output voltage from 500 mV to 18V
• Low quiescent current of less than 3 mA
• Fixed quiescent current of 5 mA
• High current limit of 1A
• Innovative input schmitt trigger circuit for low noise performance
• Integrated active low EMI filter
• Robust and reliable current limit control
• Thermal shutdowns and short circuit protections

Applications of the NCP2809BDMR2G

The NCP2809BDMR2G is used in the following applications:

• Automotive audio systems
• Power switching and DC/DC converters
• DC electric motor control
• Smart charging applications
• Industrial control circuits

Working Principle of the NCP2809BDMR2G

The NCP2809BDMR2G circuit consists of two main parts – the output high side switch and the current limit circuitry. The circuit is designed to provide a high level of output current limit protection with a wide range of input voltages, from 3.3V to 18V. The output switch and current limit circuitry are connected to the ground and the output via the switching devices.

The device provides a low quiescent current through the active low input and runs on a low quiescent current of less than 3mA. This makes it an ideal solution for automotive audio applications, where the power supply design is highly optimized and providing savings in both the number of components used and the overall power consumption. To protect the device from over current, the internal current limit circuitry is used and it has a high current limit of 1A.

The device monitors the input voltage and adjusts its turn-on/turn-off threshold voltage accordingly via an internal schmitt trigger circuit. This ensures a lower minimum switching voltage and reduced noise in the audio signal. Additionally, the active low EMI filter on the input helps reduce EMI noise by providing a high-frequency noise suppression of up to 20dB. Thermal shutdowns and short circuit protection features further add to the reliability of the device.

The NCP2809BDMR2G is a highly robust and reliable device that can provide a wide range of audio output current level from 500 mV to 18V and is an efficient replacement for traditionally complex and costly discrete designs for automotive audio applications.

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