UC3823DW

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The UC3823DW is an integrated off-line switcher IC which can be used to construct auxiliary power supplies for a variety of applications, such as non-isolated switching regulators, flyback converters, power factor corrected front ends, and general power supplies. It is especially useful for cost-sensitive applications since it takes only a handful of external components to implement various topologies. This article will cover the general application field and working principle of the UC3823DW.

Application Field

The UC3823DW is a highly efficient off-line switcher IC which is suitable for a variety of applications, including non-isolated switching regulators, flyback converters, power factor correctors, and single-ended primary inductance converters (SEPIC). It can be used in cost-sensitive applications since it only requires a few external components to implement different topologies. Additionally, the UC3823DW is capable of controlling both the primary and secondary sides of an off-line converter, with a controlled switching frequency and compensation of each side. This simplifies the design process when constructing an auxiliary power supply.

Working Principle

The UC3823DW is a current mode integrated circuit for off-line switch mode power supply applications. It is designed to generate a fixed frequency PWM (pulse width modulation) waveform in response to an input voltage. The on-chip control circuitry monitors the load current, then adjusts the pulse width of the output waveform to maintain a constant current. This ensures that the maximum load current remains within the specified range and is not affected by changes in line voltage.

The UC3823DW incorporates an internal fixed frequency oscillator with an adjustable duty cycle. The frequency can be fine-tuned by selecting an external capacitor of the appropriate value. The duty cycle can be adjusted by applying an external voltage to the oscillator\'s control pin. The UC3823DW also has an adjustable high-side current sense input, allowing the maximum load current to be set by connecting a sense resistor to the control pin. This allows a wide range of applications to be powered by the UC3823DW.

The UC3823DW also features an internal H-bridge for synchronous rectification, as well as current-mode digital circuitry for protecting the device from overloads, undervoltage and overvoltage conditions. It also features an integrated low-dropout linear regulator to supply reference and operational voltages for the on-chip circuitry. Finally, the UC3823DW features dual analogue CMOS inputs for controlling the output voltage, current and frequency.

In summary, the UC3823DW is a highly efficient and versatile off-line switcher IC which is suitable for a variety of non-isolated power supply applications. It only requires a few external components and can be easily adjusted to control the load current. The UC3823DW is especially useful for cost-sensitive applications since it simplifies the design process when constructing an auxiliary power supply.

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