UCC2894PW

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The UCC2894PW is a primary side, peak current-mode controller designed for offline switch-mode power supplies, such as Flyback, Fly-Buck, Buck, and Buck-Boost converters. This integrated circuit (IC) operates with a wide supply voltage range up to 100V, so it can be used for both AC and DC power applications. The UCC2894PW uses a hysteretic current mode control method, allowing it to have a relatively fast response time with low output voltage ripple.

The UCC2894PW is capable of supplying up to 5A of peak current. The device includes an error amplifier, a comparator, drivers, an oscillator, and an adjustable voltage reference. The adjustable voltage reference is an internal bias circuit that can be used to compensate for the Vce drops due to the transistor\'s turn-on and turn-off switching times. The UCC2894PW also includes an external compensation capacitor and a frequency compensation terminal. The external compensation capacitor is used to compensate for the output voltage ripple and the frequency compensation terminal is used to ensure that the loop is stable.

The UCC2894PW is designed to operate in continuous or discontinuous conduction modes, providing high efficiency for a wide range of input and load conditions. In continuous mode, the power switch is always on, allowing for high efficiency and low noise operations. In discontinuous mode, the power switch is turned off when the current in the power inductor reaches zero. This mode is used to provide high efficiency at low load conditions.

The UCC2894PW also provides dynamic current limit protection. This is a feature that limits the maximum current that can flow through the IC at any time. If the peak current exceeds the limit, the power switch is turned off to prevent damage to the system. It also provides output voltage overvoltage protection by monitoring the output voltage and limiting the peak current when the output voltage exceeds the threshold. This helps to ensure that the system will not be damaged due to excessive current or voltage.

The UCC2894PW is an ideal choice for offline switch-mode power supplies with wide supply voltage range up to 100V and high efficiency up to 95%. Its unique features such as hysteretic current mode control, dynamic current limit protection, and overvoltage protection make it a reliable and cost effective solution for various power applications.

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