UCC28742DBVT Integrated Circuits (ICs)

Series:	*
Packaging:	Tape & Reel (TR)
Part Status:	Active

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Introduction

The UC28742DBVT is a non-synchronous offline buck switching regulator with a high power density suitable for a wide range of applications. It is a state-of-the-art device for low voltage DC/DC applications, delivering up to 2A continuous output current and can regulate up to 18V of output voltage from an input voltage as low as 4V. The UC28742DBVT is fully integrated, incorporating an advanced power MOSFET and is ideal for powering low current digital devices from an unregulated power source, such as a battery. It can be used to efficiently regulate the voltage for a wide range of applications, including cell phones, gaming consoles, portable computers and Wi-Fi enabled devices.

Application Field

The UC28742DBVT is ideal for powering low current digital devices from an unregulated power source, such as a battery. The device is designed to efficiently regulate the voltage for a wide range of applications such as cell phones, portable computers, gaming consoles, networking and medical equipment as well as other applications requiring EMC compliance. The device is capable of providing a regulated output voltage of up to 18V and can supply up to 2A of continuous load current at an efficiency of up to 92%.The high-efficiency of the device makes it ideal for applications where power consumption is critical. It is also suitable for applications that require a wide range of input voltage, from 4V to 18V, such as automotive, industrial, military and telecom applications. The device has an input under-voltage lockout (UVLO) function to ensure safe operation, and a shutdown function for power saving. The device is also compatible with various PWM control modes for better system optimization.

Working Principle

The UC28742DBVT is a non-synchronous, offline buck switching regulator. It contains an integrated power MOSFET and rectifier bridge, a voltage-mode controller, detect and protection circuitry and an output voltage trim feature. The device is designed to regulate and convert power from an unregulated power source with a range of 4V to 18V to a desired output voltage. The voltage-mode controller monitors the output voltage using an internal error amplifier and uses a feedback loop to adjust the duty cycle of the power MOSFETs in order to maintain the desired output voltage. The power MOSFETs are driven by an oscillator with a fixed frequency and with a duty cycle modulated by the voltage-mode controller. The rectifier bridge converts the rectified input supply voltage to the desired output voltage, committing only a portion of the energy from the input voltage.In addition to the integrated power MOSFETs and rectifier bridge, the device also contains an internal over-temperature protection circuit, an under-voltage lockout circuit and a short circuit protection circuit. The over-temperature protection circuit senses the temperature of the power MOSFETs and shuts down the device if the temperature exceeds a predetermined limit. The under-voltage lockout circuit prevents supply voltages from going lower than 4V. The short-circuit protection circuit detects an over-current condition and shuts down the device to prevent any damage.

Conclusion

The UC28742DBVT is a non-synchronous offline buck switching regulator with a high power density suitable for a wide range of applications. It is designed to regulate and convert power from an unregulated power source with a range of 4V to 18V to a desired output voltage. The device has an input under-voltage lockout (UVLO) function to ensure safe operation, and a shutdown function for power saving. It is ideal for applications where power consumption is critical, and it can provide a regulated output voltage of up to 18V and can supply up to 2A of continuous load current at an efficiency of up to 92%. Additionally, the device is compatible with various PWM control modes for better system optimization.

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