UCC28720DR Integrated Circuits (ICs)

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The UCC28720DR is an integrated circuit designed to serve in offline and isolated AC-DC converters and switchmode power supplies. It contains a controller, a high-voltage start-up circuit, oscillator, and protected gate driver, allowing the user to design a simple and cost-effective offline switching power supply.

The UCC28720DR dissipates continuous operating currents up to 7.3mA and standby currents of 7μA and is offered in either a 16 pin SOIC or 6 pin PDIP package. It has an operating voltage ranging from 4.75V to 28V and is characterized for operation from -40°C to +85°C.

The UCC28720DR\'s gate driver has a typical generation capacity of 750mA sink and 350mA source. Its feed-forward input can be used to adjust the input current from 0mA to the maximum current rating of 1A. The device also features adjustable frequency operation from 50kHz to 1MHz.

The UCC28720DR is provided with a high-voltage start-up circuit. It serves to draw the initial current pulse allowing the power supply to function at startup with no external circuitry. During normal operation, the current is closely monitored by the device’s current-limit circuit, which will reduce the current output if it exceeds 5A.

The controller within the UCC28720DR uses an internal RMS detector to provide feedback control. For improved response, the device also allows for a voltage-mode control with a sense resistor. Additionally, the output voltage can be adjusted by means of an external resistor, typically connected between pin 12 and GND.

In applications where additional features are required, such as over-voltage and over-temperature protection, the UCC28720DR supports an external resistor divider connected to pin 11. This pin can also be used to operate the device in shutdown.

The UCC28720DR also provides integrated soft-start and output voltage ramping. To take advantage of this feature, the user must connect a capacitor between pin 3 and GND. This capacitor must also be match with the value of an external resistor connected between pin 2 and GND.

In summary, the UCC28720DR is a versatile IC for AC-DC conversion and switch-mode supplies. Its cost-effective design and range of features make it an ideal solution for a wide range of end-use applications such as power-supply designs for white goods, industrial and office equipment, and telecommunications systems.

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