BD3818KS

Series:	--
Packaging:	Cut Tape (CT)
Part Status:	Obsolete
Function:	Audio Signal Processor
Applications:	Consumer Audio
Number of Channels:	6
Interface:	Serial
Voltage - Supply:	5 V ~ 7.4 V
Operating Temperature:	-20°C ~ 75°C (TA)
Specifications:	--
Package / Case:	80-BQFP
Supplier Device Package:	80-SQFP (14x14)

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Overview

The BD3818KS is an audio special purpose IC from Rohm Semiconductor. It is a DC/DC converter developed for use in audio systems and is suitable for audio applications such as speaker systems, receivers and other audio devices.

Application Field

The BD3818KS is used for DC/DC conversion in audio systems. It is suitable for applications in high-fidelity audio systems and multi-channel audio systems. It can be used in various applications such as car audio, music players, audio amplifiers, and other audio devices. It has integrated support for a wide input range with higher efficiency and low noise level. It also has protection functions against over-voltage, over-current and over-temperature.

Features

The BD3818KS has a wide input range of 6V to 50V, a wide output range of 0.8V to 60V, and a maximum output current of 1A. It has a high efficiency with a low noise level, and has integrated support for a wide temperature range of -40°C to +150°C. It also supports pre-charging, output voltage soft start, over-temperature protection and current limit protection.

Working Principle

The BD3818KS is based on a pulse frequency modulation (PFM) control scheme. The PFM control scheme is used to generate output frequency and parameters like switching current and duty cycle based on the feedback signal from the output. The input voltage, output voltage and the feedback signal are all monitored by the BD3818KS in order to maintain accuracy and stability of the dc/dc converter. It is also capable of pre-charging the output voltage before turning the output on. The pre-charging feature is critical for safety, improving startup performance and providing additional protection against inrush current.The BD3818KS also supports a soft start feature, which allows the output voltage to slowly rise from zero to its final value. This prevents over-current and over-voltage conditions at start up.Finally, the BD3818KS also has several protection features such as over-temperature protection, output over-voltage protection, output under-voltage protection and output current limit protection. These protection features work together to ensure safety and reliability of the device.

Conclusion

The BD3818KS is an audio special purpose IC that is suitable for audio applications such as speaker systems, receivers and other audio devices. It has a wide input range of 6V to 50V, a wide output range of 0.8V to 60V and a maximum output current of 1A. It is based on a PFM control scheme and has integrated pre-charging and soft start features. It also has several protection features such as over-temperature protection, output over-voltage protection, output under-voltage protection and output current limit protection.

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