UC3843AN Integrated Circuits (ICs)

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

UC3843AN is a high performance current mode PWM controller. It is a monolithic, high performance, fixed frequency pulse width modem (PWM) switching controller incorporating on-chip video clamp which is mainly used for making pulse width modulated controls for both commercial and consumer applications. This controller has the ability to regulate DC-DC converter output voltages with the help of an external pulse width amplifier (PWM), and it is suitable for applications such as power supplies, switching power amplifiers, AC/DC converters and other switched energy systems.

The UC3843AN is built with a unique design concept, utilizing current mode switching, linear modulation, and safety features to provide a reliable and stable operation over a wide range of switching frequencies. This controller features a broad frequency range (from 550kHz to 30MHz) and a wide operating temperature range (0°C to +90°C). In addition, it features a built-in video clamp, a single-ended or differential input, and a thermal shutdown or overcurrent protection. The user-friendly design provides adjustable oscillator frequency and adjustable dead time, which allow users to optimize operating frequencies over the entire load range without sacrificing efficiency. Its wide input voltage range from 4V to 20V makes it suitable for a wide range of applications such as AC/DC switching power amplifiers and DC-DC power converters. In addition, the UC3843AN controller incorporates a synchronized input for better noise immunity and synchronization of multiple switching devices.

The UC3843AN controller offers a wide range of features which makes it suitable for widespread industrial, communication and instrumentation applications. The controller utilizes a linear current mode control loop wherein a single current comparing circuit precisely regulates the output voltage of the switching regulator. The current mode control loop has excellent line and load regulation characteristics and provides fast response time in the presence of changes in the load. This allows the controller to maintain accuracy even when the input and output voltages change significantly. It also features an on-chip video clamp which enables the controller to precisely regulate the output voltage under noisy or heavily varying load conditions. The video clamp feature provides a unique way to protect against electrical noise generated by other switching regulators or other noise sources.

The UC3843AN controller utilizes an over-current protection (OCP) circuit to protect the switched power stages against any short circuit or overload situations. The OCP circuit limits the peak inductor current and thus prevents it from reaching a damaging level. This effectively ensures the reliability and safe operation of the system. In addition, the controller incorporates a thermal shutdown circuit to protect the system against any thermal overloads which may damage its components. The thermal shutdown circuit is triggered when the internal temperature of the controller reaches a predefined limit.

Finally, the UC3843AN controller incorporates a PWM output pin which allows the circuits to be synchronized with an external pulse width modulator. Synchronization ensures a smooth switching of the power stages and helps to eliminate EMI-generated noise. Also, synchronization enables multiple switching paths to be synchronized and allows a user to have multiple paralleled power stages operating in phase with each other.

In conclusion, the UC3843AN is a reliable and cost-effective PWM switching controller which provides excellent current mode control and protection features. Its wide input voltage range, high-performance features and low power consumption make it suitable for a wide range of applications. Its synchronous input and on-chip video clamp ensure a stable operating environment in the presence of electrical noise, while its over-current protection circuit and thermal shutdown circuit provide extra protection against any unexpected over-rush and thermal overloads. Its adjustable oscillator frequency and adjustable dead time allow an optimized and efficient operation even under overclocking and other extreme environmental conditions. Thus, the UC3843AN is an ideal choice for many power supply applications.

The specific data is subject to PDF, and the above content is for reference