UC3825QTRG3

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UC3825QTRG3 Application Field and Working Principle

The UC3825QTRG3 is a versatile DC-to-DC switching controller designed mainly to be used in industrial and consumer power supply design. It can also be used to generate motor-drive control signals and other low-voltage switching operations. It offers improved control of voltage and current stability, power supply efficiency, and speed of response.

Features

• Wide input voltage range from 3 V to 30 V
• High-speed current-mode control
• Integrated sense FET
• Pulse-by-pulse current and voltage limit
• On-chip slope compensation
• Inductive load detection
• Output short-circuit protection

Application Field

The UC3825QTRG3 switching controller is designed primarily to reduce the cost and complexity of a DC-to-DC power supply design. It can be used in a wide variety of SMPS applications including DVD players, LCD monitors, Hard Disc drives, adapter charger and so on.

The UC3825QTRG3 is also suitable for a variety of consumer and industrial applications such as motor drives, device charging, and even battery-operated devices. This flexibility means the UC3825QTRG3 can be used in a variety of power supply designs.

Working Principle

The UC3825QTRG3 is a current-mode switching controller with a high frequency range. The power created by this controller is proportional to the “duty cycle” provided to the load, which is calculated by the input voltage, the output voltage, and the current sense resistor.

The UC3825QTRG3 operates with very low component count. It contains several integrated functions that provide protection against overloads and shorts, while maintaining the accuracy of the current and voltage. The pulse-by-pulse current and voltage limit protection helps to avoid sudden current surges and overvoltage condition.

The UC3825QTRG3 also contains a switch that enables a wide range of inductive and capacitive load types. The integrated inductive load detection detects a zero voltage leading edge, which is useful in motor control applications. The integrated switch also blocks mains voltage and provides EMI improvements.

The UC3825QTRG3 is ideal for use in a variety of modern DC-to-DC power supplies where cost and simplicity are important. It offers improved control, efficiency and speed of response, making it an ideal choice for a variety of power supply design applications.

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