BA9743AFV-E2

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BA9743AFV-E2 is an integrated monolithic DC-DC switching controller designed for use in step-down and step-up, fly-back switching power supplies with the voltage range from 4.50V to 20.0V, and the power range from 1W to 30W. It is an appropriate family of integrated circuits to control a wide range of power supplies with high efficiency and precision.

Overview

The BA9743AFV-E2 belongs to the PMIC - Voltage Regulators - DC DC Switching Controllers family. This device includes an 18V read voltage limit function, and it also has a ramp-state detection function. It supports both synchronous and asynchronous rectification and can automatically detect the presence of synchronous MOSFETs. The current-sensing circuit has integrated current-limit, peak-current-limit, and average current-limit functions. The cycle-by-cycle overcurrent-limit circuit has an adjustable tripping point and is designed to help protect the power supply from inductor saturation. The device also supports a soft start-up control function, which can also be used as a current limit.

Features

The BA9743AFV-E2 has several features that make it an ideal integrated solution for a wide range of power supplies. It has an integrated current limiting function with adjustable voltage trip points which allows for a programmable overcurrent limit. Additionally, the device includes a temperature-sensing function that allows temperature control and protection of the power supply. This can be set to shut off the power supply when the temperature reaches a certain level. It also includes an overvoltage protection and an overcurrent protection, both with adjustable thresholds. It also includes an undervoltage lockout, which ensures the system is not damaged by an unintended shutdown.

Application Field and Working Principle

The BA9743AFV-E2 is an ideal choice for a wide range of applications. It is suitable for step-down and step-up converters, as well as fly-back, resonant and bridgeless designs. Due to its flexible features, it can be used for many different applications, including DC-DC converters, AC-DC converters, power supplies and battery chargers.

In order to control the output voltage of a switching power supply, the BA9743AFV-E2 relies on an error amplifier and a current-sense amplifier. The error amplifier compares the Reference voltage (which is the set DC output voltage) with the feedback voltage. This difference between the two, (referred to as the Error Signal) is used to control the output voltage of the power supply. The feedback voltage is obtained from a voltage regulator or voltage sensing device typically located at the output of the power supply. The output voltage will be stabilized if the actual output voltage is compared with the reference voltage.

The current-sense amplifier is responsible for monitoring the output current of the power supply. By monitoring this current, the power supply can be protected from overcurrent faults and optimise efficiency. In order to do this, a current sense resistor is used, which will sample the current passing through it and convert it into a voltage. The current-sense amplifier will output a voltage that is proportional to the current passing through it.

By combining the functions of the error and current-sense amplifiers, the BA9743AFV-E2 is able to control and optimise the output voltage of the power supply. This is done by varying the duty cycle of the switching elements. The duty cycle is the ratio of the switch on-time to the total period of a transfer cycle. By adjusting the duty cycle, the amount of current supplied to a load can be changed and the output voltage of the power supply can be regulated.

Conclusion

In conclusion, the BA9743AFV-E2 is an ideal choice for PMIC - Voltage Regulators - DC DC Switching Controllers applications. It offers integrated current and voltage protection, adjustable overcurrent limit, temperature sensing, and support for both synchronous and asynchronous rectification. Its features make it a versatile and reliable solution for many different types of power supply applications.

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