UCC38C42DGK

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UCC38C42DGK belongs to the PMIC - AC DC Converters, Offline Switchers. It is a wide input voltage range regulator with an under voltage lockout (UVLO) feature. It is a 1A peak (continuous 800mA) flyback converter. It is a non-isolated, fixed frequency switch mode power supply (SMPS) controller with “Burst ModeTM” operation and cycle-by-cycle current limiting. The UCC38C42DGK is designed to provide all the power conversion functions of a flyback SMPS, including turn-on, off and on soft start, over temperature protection, cycle-by-cycle current limit, and UVLO. It has a programmable regulating voltage and is designed for input voltage of 85 to 265 VAC, with an operating frequency from 40 to 150KHz. UCC38C42DGK is well suited for driving a wide variety of off-line SMPS with minimal external components.

The UCC38C42DGK is composed of several functional blocks. The burst mode control block is the heart of the system and regulates the currents and voltages in the isolated pump transformer circuit. It senses when the current and voltage of the primary winding reaches the set limits and shuts down the system, protecting it from overload and short circuits. The control block also incorporates a soft-start and OVP (overvoltage protection) circuit. The burst mode control block is followed by a voltage sensing circuit that allows the user to set a regulated voltage level to the load via a voltage control pin. This circuit uses an opto-isolator and a current-to-voltage converter to sense the rectified voltage and provide regulation.

The UCC38C42DGK also contains a number of analog and digital blocks. These blocks are responsible for monitoring the operation of the system, such as detecting the status of the rectified voltage, current, temperature, and the operation state of the power supply. The block also contains functions such as clock generator, ultra low dropout regulator, active loop compensation circuit, clock buffer and Regulated Voltage Detection circuit.

In order for the UCC38C42DGK to function properly, it must be connected to an external rectifier transformer and an output filter capacitor. The transformer primary capacitor should be connected between the VIN and VCC pins of the UCC38C42DGK and the secondary capacitor should be connected across the output load terminals. In addition, a snubber circuit must also be placed across the transformer to prevent high frequency switching noise. The output filter capacitor should be connected across the output load terminals.

The UCC38C42DGK is capable of driving a wide variety of off-line SMPS. It is suitable for many applications such as DC-DC regulators, switching mode power supplies and offline power adapters. Some of its applications include: RF transmitters, home audio/video electronics, external battery chargers, and various motor control circuits. It is also applicable to light dimmers and LED lighting applications.

The UCC38C42DGK is easy to use and offers many advantages such as high efficiency, programmable regulating voltage, low standby power, and low cost. Furthermore, it is compliant with various safety standards such as UL, CSA, and CE. The UCC38C42DGK is a reliable, robust and cost effective solution for many off-line applications.

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