Texas Instruments UCC3808D-2 Low-Power BiCMOS Current-Mode PWM Controller

The UCC3808D-2 from Texas Instruments is a versatile and efficient PWM (Pulse Width Modulation) controller that is part of their low-power BiCMOS current-mode family. Designed for a wide range of power supply applications, this controller is particularly suited for use in offline and DC-to-DC fixed-frequency current-mode switching power supplies.

One of the key features of the UCC3808D-2 is its low startup and operating current. The startup current is typically just 0.5µA, and the operating current is only 2.5mA, making it an energy-efficient choice for modern electronics. This reduced power consumption is particularly beneficial in battery-operated devices, where extending the battery life is crucial.

The device operates with a voltage range of 4.5V to 15V, which allows for flexibility in various circuit designs. The UCC3808D-2 also boasts a programmable soft-start function that limits the inrush current during startup, thereby enhancing system reliability and extending the life of the power supply components.

Another important feature of the UCC3808D-2 is its current-mode control, which provides inherent line feed-forward, cycle-by-cycle current limiting, and ease of loop compensation. The current-mode architecture simplifies the design process and improves the response to load transients and input voltage variations. This results in a stable and reliable power supply, even under challenging conditions.

The device is offered in a compact 8-pin SOIC package, making it suitable for space-constrained applications. Additionally, it supports a wide range of switching frequencies, up to 1MHz, allowing designers to optimize their power supply for efficiency or for the size of the passive components.

With features such as automatic feed-forward compensation, a 1A peak output current capability, and an internally trimmed reference with a tight tolerance of 1%, the UCC3808D-2 is a high-performance solution for power supply design. Whether you are developing an AC-DC converter, a telecom power supply, or a portable device charger, the UCC3808D-2 provides the functionality and reliability required for advanced power management applications.