UCC2809PW-1G4

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The UCC2809PW-1G4 is an offline AC/DC switcher IC from Texas Instruments. As an advanced mode PWM controller with integrated gate driver, this product is optimized for offline power supplies. It has an integrated high-voltage start-up regulator, output start-up current limiting circuit and protected overvoltage circuit. It minimizes external components for lower cost, reduces design cycles and risk, and ensures quality system performance thus adding design flexibility.

This IC was designed with an optimized single-cycle control architecture. It provides full cycle-by-cycle current limit with fast response, providing best-in-class light load efficiency. With its integrated high-voltage startup booster and coreless reset winding, it is able to monitor input voltage and the surrounding temperature accurately. The IC also features low turn-on and turn-off thresholds.

The UCC2809PW-1G4 operates with adjustable with fixed frequency switching for minimized loss. It is also well-suited for low power AC-DC converter applications and is ideal for a variety of power supplies, from cell phone chargers to small personal electronics. It has an input operating range from 85VAC to 265VAC, which makes it suitable for use in global markets.

The UCC2809PW-1G4 also features a wide operating temperature range of -40°C to +85°C. It has low standby current draw, allowing it to maintain efficiency under low power loads. It also provides additional features such as minimal external component counts, programmable peak current limit, and thermal shutdown.

It works by using pulse width modulation (PWM) to convert a relatively low-voltage DC input into a higher voltage AC output. This is done by rapidly switching on and off the current through a transformer. The transformer boosts the input voltage to a level that is suitable for the load, which is then rectified to produce the output voltage. The device then monitors the output voltage and controls the switching frequency to ensure that the output voltage does not exceed safe levels. It also monitors the input voltage and adjusts the duty cycle of the PWM signal so that the output voltage remains in a safe, regulated range.

To ensure safety, the UCC2809PW-1G4 includes a wide array of protective features such as undervoltage, overvoltage and short-circuit protection. The device also features an integrated bootstrap diode and latch-off protection to prevent false starts at higher input voltages. The wide operating range and safety features make it suitable for a wide variety of applications.

Overall, the UCC2809PW-1G4 is an excellent solution for low power AC/DC converter applications. It is an optimized, low-cost and power efficient solution that is designed to provide reliable performance even in the most demanding applications. Its integrated features and protection mechanisms ensure safe and reliable operation in a wide variety of applications.

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