BA178M09T

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BA178M09T Application Field and Working Principle

The BA178M09T is a 3-pin monolithic linear voltage regulator suitable for a wide range of applications. It operates reliably both as a positive and a negative voltage regulator. The BA178M09T has an integrated voltage regulator that converts an input voltage in the range of 1.0V to 8.0V to an output voltage of 5.0V, with a maximum current of 0.9A.

Applications

The BA178M09T is widely used in the industry. Its applications include audio series, mobile phone power management, battery power management, intelligent device control, low power control system, mobile information terminal and many other DC/DC or AC/DC power supply systems.

Function Overview

The BA178M09T is a fixed linear monolithic voltage regulator with low output noise, minivoltage, low dropout voltage, low noise and temperature stability. It requires only two external capacitors to compensate for the internal output current and external power supply ripple current. The device includes a built-in protection circuit, which ensures the appropriate current limit protection and short circuit protection.

Working Principle

The BA178M09T is an integrated voltage regulator suitable for a wide range of applications. It is based on an error amplifier, which is used to compare the sensed output voltage to a fixed reference voltage. The output of the error amplifier is used to control an external seriespass transistor, which adjusts the current into the regularity. The error amplifier is also connected to the output of the series pass transistor; this provides the necessary feedback to the error amplifier to keep the output voltage at the desired value. The external series pass transistor needs to be selected to provide the appropriate current limit protection.

The BA178M09T also includes an overvoltage crowbar protection circuit. This circuit monitors the output voltage and will activate an SCR if the output voltage exceeds an adjustable limit. The overvoltage protection circuit also uses the error amplifier to compare the sensed output voltage to the reference voltage. If the output voltage exceeds the set limit, the SCR is activated, shorting the output voltage to ground.

Conclusion

In conclusion, the BA178M09T is a 3-pin monolithic linear voltage regulator suitable for a wide range of applications, from audio series to mobile phone power management to battery power management. It operates reliably both as a positive and a negative voltage regulator, and requires only two external capacitors to compensate for its internal output current and external power supply ripple current. The device also includes an integrated protection circuit, which ensures the appropriate current limit protection and short circuit protection.

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