UCC28221DG4

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PMIC (Power Management IC) solutions serve to reduce component count and cost, increase system performance and reliability, and provide additional end-product features while also decreasing power loss, thus increasing energy efficiency. AC DC converters, offline switchers, and other PMIC solutions are integral components of electronic systems, providing the ability to monitor, manage, and manipulate the power going between a device\'s power source and its load. UCC28221DG4 is one such component and its application field and working principle are described here.<\/p>

Application Field of UCC28221DG4<\/h2>

UCC28221DG4 is a low-cost controller IC in the current UCC28200 family manufactured by Texas Instruments. It is specifically designed for offline switch-mode power supplies (SMPS) that use the \'flyback\' topology and is suitable for applications such as switch mode DC-DC converters and AC-DC converters operating up to 25W.<\/p>

This IC has many applications such as in power supplies, solar power converters, lighting, telecom/networking applications, medical applications, and industrial applications. The UCC28221DG4 also meets energy-efficiency requirements including ENERGY STAR, CoC, and ErP, making it a suitable choice for energy-saving applications.<\/p>

Working Principle of UCC28221DG4<\/h2>

The primary function of UCC28221DG4 is to provide a low-cost, high-performance flyback solution for ac-dc converters and offline switchers. It consists of an integrated single-channel oscillator, a comparator for voltage clamping, a fault conditions detector, and a switching controller circuit. The IC also integrates multiple protection functions such as over-voltage protection (OVP) and over-current protection (OCP) to prevent damage to the circuit.<\/p>

When in use, the integrated oscillator generates a sawtooth waveform that is used to control the switching frequency. The flyback topology utilizes this switching frequency to switch current from the primary to the secondary windings of the transformer, thus transferring energy from the primary side to the secondary side of the circuit. The integrated voltage clamping function prevents the output voltage on the secondary side from exceeding the clamping threshold, while the current limit protection, short-circuit protection, and under-voltage lock-out (UVLO) features ensure safe operation of the IC.<\/p>

The integrated low-side MOSFET driver and high-side MOSFET driver guarantee high efficiency and a reliable operation. The UCC28221DG4 is specially designed to drive primary side N-type MOSFETs in the flyback topology, thus preventing additional components from being added. In summary, the UCC28221DG4 is an ideal choice for offline switch-mode power supply (SMPS) systems requiring low cost, high-efficiency, and reliable operation.<\/p>

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