UC3843D8G4

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UC3843D8G4 is a current mode PWM controller designed primarily for offline switch power regulator and high power factor correction applications. It provides excellent regulation characteristics and is simple to design with. The UC3843D8G4 is available in a 4-pin Power SOT-223 package. With these features, the UC3843D8G4 is ideally suited for cost-sensitive AC/DC and DC/DC applications where the design flexibility of using the current mode PWM approach is desired.

Application Field of UC3843D8G4

UC3843D8G4 is primarily used for offline switch power regulator and high power factor correction applications. It provides good regulation characteristics in both AC/DC and DC/DC applications. This controller is mainly used for LED lighting, LED displays, LED drivers, chargers, SMPS (Switch Mode Power Supply), and any other applications that require current mode PWM control. It is ideal for cost-sensitive applications where the flexibility of a current mode PWM approach is desired.

Working Principle of UC3843D8G4

At the heart of the UC3843D8G4 is its current mode PWM control loop. This loop uses an external sense resistor to sense the output current, and then compares that current to the set current level programmed into the device. When the sensed current exceeds the set current level, a pulse width modulation (PWM) signal is generated. The duty cycle of this signal is adjusted such that the output power remains constant.

In addition to the current mode PWM control loop, the UC3843D8G4 also features a safety timer which shuts down the controller if the set current level is not maintained. This helps to ensure the safety of the system in the event of an overload condition. The UC3843D8G4 also has a number of features which allow the designer to customize the controller to the application at hand. These features include adjustable oscillator frequency, adjustable peak current level, adjustable soft-start time, and over temperature protection.

Conclusion

In conclusion, the UC3843D8G4 is a highly versatile current mode PWM controller, perfect for use in cost-sensitive AC/DC and DC/DC applications, such as LED lighting, LED displays, LED drivers, chargers, and SMPS (Switch Mode Power Supply). It provides excellent regulation characteristics and is simple to design with. This controller includes safety features such as a safety timer, adjustable peak current level, adjustable soft-start time, and over temperature protection, as well as customizable features such as adjustable oscillator frequency. Therefore, the UC3843D8G4 is ideal for a wide variety of applications.

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