UCC2813DTR-2

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The UCC2813DTR-2 is a monolithic, fixed frequency switching regulator controller that operates from a wide input voltage range from 7.5V to 35V. It is manufactured by Texas Instruments and its purpose is to facilitate the design of high performance, simple, off-line switching regulators, providing the designer with the flexibility to select switches, inductors, and capacitors. This integration allows cost effective solutions with high reliability and short circuit protection.

The UCC2813DTR-2 can be used in offline switching applications such as DC-AC inverters, AC-DC power supplies, battery chargers and any other offline switcher application. This versatile device can provide up to 95% conversion efficiency when properly designed thanks to its advanced peak current control and valley switching capabilities. The device is designed to provide a regulated output current with low external component count. The UCC2813DTR-2 operates from an input voltage range of 7.5V to 35V.

The UCC2813DTR-2 has several features that enable flexibility and excellent performance. It features an adjustable oscillator frequency up to 500kHz, internal soft-start, programmable dead-time control, cycle-by-cycle current limiting, lossless valley current control, programmable under-voltage lockout, output overload protection, and thermal shutdown. In addition, the UCC2813DTR-2 includes a feature that allows for use of an external resistor to provide a voltage boosting function.

To ensure reliable operation, the UCC2813DTR-2 provides built-in protection features such as over-temperature shutdown, under-current limiting, output over-voltage protection and over-current protection. Furthermore, its under-voltage lockout (UVLO) feature prevents unreliable system operation caused by an undesirably low supply voltage.

The working principle of the UCC2813DTR-2 is to control the switching frequency and on-time of a standard PWM (pulse-width modulation) circuit. The device uses an internal oscillator to generate the switching frequency and the logic level output called EN (enable) is used to start and stop the oscillator. The internal error amplifier compares the output voltage to a reference voltage and provides an output current to a comparator, thus controlling the duty cycle of the PWM control signals.

The UCC2813DTR-2 can be combined with an external MOSFET to provide a cost-effective and reliable solution for many offline switching applications. The device can be employed in applications varying from AC-DC regulated power supplies to DC-AC inverters. The UCC2813DTR-2 offers flexibility and excellent performance at a reasonable cost, making it an ideal choice for many applications.

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