UCC28221D

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The UCC28221D, manufactured by Texas Instruments, is a high performance single stage offline switcher for low-power, continuous mode power supply design. It is designed to provide cost-effective and highly accurate solutions for a wide variety of such applications. The device features a highly efficient fixed-frequency, pulse-width modulation (PWM) control topology, as well as Brown-out, OVP and low quiescent current protection features. The UCC28221D is suitable for a range of offline, low power, AC-DC converter applications.

The UCC28221D\'\'s PWM control topology reduces the number of external components needed compared to non-PWM controllers. The device features an internal leading edge modulation, a constant frequency operation of 50kHz, and a current mode control loop with selectable soft start time for improved EMI performance and protection against short-term overload conditions. The device also includes integrated overload protection, low- and over-voltage protection, as well as an internal bi-directional/open-drain shutdown logic input.

The UCC28221D is available in a SOIC-8 package and is rated for operation from -40°C to 85°C ambient temperature. It is a universal offline power supply solution capable of providing output voltages from 5V to 48V. The device supports a wide operating temperature range, making it suitable for a range of applications including industrial, medical, and consumer products.

The device\'s lead-edge modulation architecture allows for easy synchronization of multiple synchronous switch controllers by having the rising edge of the current ripple voltage coincide with each other. The internal current mode control loop provides an improved line and load regulation compared to non-current mode control topologies. The device features a PFM self-biasing control that eliminates the need for a separate bias winding while also reducing total component count. The device also features a variable frequency option, allowing users to tailor the operation to optimize efficiency and minimize switching losses.

Overall, the UCC28221D is a highly efficient single-stage offline switcher for low-power AC-DC converter applications. It is available in an 8-pin SOIC package and offers high levels of protection and a wide operating temperature range. The PWM control topology and variable frequency option ensure a high-efficiency design, while the lead-edge modulation architecture simplifies synchronization when multiple controllers are needed. The device is suitable for a wide range of low-power, AC-DC converter applications.

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