UCC2802D

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The UCC2802D is an integrated circuit of the family of Peripheral Messages Integral Controller (PMIC) consisting of an Offline Switching Supply and an AC/DC Converter. The device has a wide range of applications in industrial, commercial and household systems/products, and its wide input voltage range (3V to 25V) makes it suitable for a wide range of power operating levels. Its output voltage is adjustable and it offers high efficiency over a wide input range. Its operating temperature range is -40°C to +85°C.

Features

The UCC2802D has a wide range of features designed for efficient operation:

• High Efficiency (up to 97%);
• Output voltage from 3.5V to 25V;
• Input voltage range from 3V to 25V;
• High power factor (96%);
• Low total harmonic distortion;
• Rugged package;
• Automatic restart;
• Output over voltage protection;
• Thermal protection;
• Fold back current limit.

Applications

The UCC2802D is well suited for a wide range of applications due to its wide input voltage range (3V to 25V) and adjustable output voltage. It is commonly used in a variety of industrial, commercial and home systems/products, including but not limited to:

• Switching supply for home appliances;
• Adapter for laptop computers;
• Switching supply for personal computers;
• UPS for industrial equipment;
• Set-top-boxes;
• Switching supply for LCD televisions.

Working Principle

The UCC2802D is an integrated device composed of an offline Switching Supply and an AC/DC Converter. The switching supply operates in an AC-DC cycle and the converter operates in a DC-DC cycle. The AC-DC cycle begins with the AC input voltage being converted to a DC voltage through a rectifier circuit and filtered to provide a smooth DC voltage. This is then fed to the converter, which converts the DC voltage to the desired output voltage. This is then filtered again to provide a smooth DC voltage suitable for powering the load.

The UCC2802D\'s converter operates in a single-stage buck-converter topology and is designed for ranges of power levels suitable for a wide range of industrial, commercial and home systems. This topology provides high efficiency and low total harmonic distortion over the entire input voltage range. The devices buck topology also provides fast dynamic response and over-voltage protection.

The buck-converter is composed of power stage block and control block. The power stage block composed of a MOSFET switch, diode rectifier, inductor, and output filter capacitor. The control block is composed of a high-speed voltage error amplifier, ouput voltage feedback comparator, PWM comparator, and a soft-start circuit. The switch transistor is connected to the PWM comparator, which switches the transistor at a certain frequency, depending on the magnitude of the error signal.

The UCC2802D also integrates a variety of protection mechanisms, such as a fold-back current limit, output-over-voltage protection, and thermal protection. All of these protections are designed to ensure safe, reliable operation of the device.

Conclusion

The UCC2802D is an integrated device composed of an Offline Switching Supply and an AC/DC Converter. Its wide input voltage range (3V to 25V) makes it suitable for a wide range of power operating levels. Its output voltage is adjustable and it offers high efficiency over a wide input range. Its operating temperature range is -40°C to +85°C. The device is well suited for a wide range of applications due to its efficient operation and advanced protection mechanisms.

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