UC3847DWTR

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The UC3847DWTR is a switching controller from the family of DC-DC voltage regulator controllers manufactured by Texas Instruments. It is one of the first single-chip controllers to provide a wide range of features and functions for controlling switched-mode DC-DC converters, such as step-down, step-up, and boost power supplies. This makes the UC3847DWTR an ideal choice for a wide range of applications, from commercial use to industrial applications. In this article, we will discuss the application fields and the working principle of the UC3847DWTR.

Application Fields of UC3847DWTR

The UC3847DWTR is used in a variety of fields, such as high-efficiency DC-DC converters, switched mode power supplies, Motorola PowerTrimTM systems, telecom applications, and high-voltage power supplies. This controller is capable of handling a wide range of output voltages, from 20V to 55V, with current up to 20A. It can also be used in applications that require high power factor correction and low-noise operation. In addition, the UC3847DWTR has a wide differential input voltage range and can handle inputs up to 50V.

The UC3847DWTR is particularly suitable for controlling synchronous buck regulators, which are commonly used in notebook computers, power supplies, server applications, and other consumer electronic devices. It is also well-suited for high-performance AC-DC and DC-DC boost converters as it can handle higher voltage and current loads. Furthermore, the UC3847DWTR is optimized for driving high-precision PWM current-mode converters with rapid response to load changes.

Working Principle of UC3847DWTR

The UC3847DWTR is a 16-pin integrated circuit that works in a Pulse-Width Modulation (PWM) mode to regulate the output voltage of a DC-DC switching regulator. It is internally configured as a self-oscillator, where the master oscillator frequency is set by the external components, referred to as the timing capacitor (CT) and the feedback resistor (Rf). The UC3847DWTR also requires two external power N-MOSFETs, a Schottky rectifier, an output inductor, and other components to complete the DC-DC switching regulator circuit.

The UC3847DWTR works by generating a fixed frequency triangular waveform as the oscillator signal, whose duty cycle is determined by the voltage input to its feedback pin. The output voltage of the switching regulator is compared with a feedback voltage (VFB) at the internal comparator, and the difference is outputted as an error signal (Vref). The error signal is then amplified and used to control the duty cycle of the power switch. This will, in turn, regulate the output voltage by controlling the power switch ON-time.

The UC3847DWTR offers a wide range of features and protection, including overvoltage protection, undervoltage protection, and open-loop protection. It also has a unique voltage tracking feature, which allows the output voltage of the regulator to be easily adjusted according to the application. The UC3847DWTR also has an internal soft-start (SS) mode, which reduces the in-rush current significantly, thus reducing the total power dissipation.

Conclusion

The UC3847DWTR is a robust DC-DC switching controller from the family of DC-DC voltage regulator controllers manufactured by Texas Instruments. It is commonly used in a wide range of applications, from commercial to industrial, such as notebooks computers, power supplies, high-efficiency DC-DC converters, switched mode power supplies, and more. The UC3847DWTR is optimized for driving high-precision PWM current-mode converters with rapid response to load changes. It is internally configured as a self-oscillator with an internal comparator and a voltage tracking feature, and is capable of handling a wide range of output voltages.

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