UCC28085D

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UCC28085D is an offline switcher IC manufactured by Texas Instruments. It is typically used as a flyback controller and is capable of delivering load power up to 5 Watts. It is intended for use in isolated and non-isolated AC/DC converters operating from universal input to generate an isolated output voltage. It integrates a high voltage start-up cell containing a voltage multiplier, internal bias, main current limit circuitry and an adjustable leading edge blanking capacitor for optimal performance. It comes in a 4-pin (SIP) package.

The UCC28085D can operate in both direction modes. In one direction, it is used to provide a constant output voltage, while in the other direction, it is used to provide a constant load power. The load power is delivered through the primary side of the power transformer, and the output voltage is controlled by adjusting the duty cycle of the pulse width modulation (PWM).

The IC utilizes a low-power architecture to provide efficient operation over a wide input voltage range and reduce the size of the external components. It also offers short-circuit protection by automatically monitoring the output voltage and reducing the duty cycle of the PWM to prevent the output from exceeding its rated value. Furthermore, the UCC28085D can be programmed to provide an output voltage of up to 40V, including the voltage multiplier, through the use of an external winding.

In addition to its features, the UCC28085D offers a wide selection of operating modes, including Burst Mode, Blanking Mode, and Synchronous Rectification Mode. It also allows frequency jittering, over-voltage protection, as well as over-temperature protection with hysteretic thermal shutdown. Finally, it provides the capability to enable/disable the output, through an enable/disable Vpin, which is an additional pin that can be used to enable/disable the output.

The UCC28085D is an excellent choice for offline AC/DC converters as it provides high performance and efficiency, in addition to its wide selection of operating modes. It is also designed to help save space and reduce external component requirements, making it a cost effective solution for applications such as portable electronics, battery chargers, and adapter applications.

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