UC2843BD

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The UC3843BD is a high performance pulse width modulator designed to control the speed of DC motors, light dimming and other power control applications.

The UC3843BD is a high frequency, high voltage monolithic integrated step-down switching controller that offers excellent performance, low noise and good system flexibility.

Application Fields

The UC3843BD can be used in consumer, industrial, and automotive applications such as DC motor control, light dimming, and power conversion, including switched-mode power supplies (SMPS) and non-isolated voltage regulator modules (VRMs). The UC3843BD also offers a variety of control features for constant frequency, variable frequency, hysteretic, and burst-mode control.

In addition to the power conversion applications, the UC3843BD is also suitable for powering inductive loads such as relays, solenoids, and stepper motors. The UC3843BD provides a very low shut-down current, making it suitable for virtually any battery-powered device.

Working Principle

The UC3843BD is a monolithic IC with an integrated pulse width modulator (PWM) that provides a controlled current or voltage output signal. This signal is applied to the gate of an external power switch to regulate the output voltage and/or current.

The PWM signal is generated by comparing the voltage at the output of an error amplifier to a signal from an on-chip ramp generator. The width of the pulse is then adjusted to keep the output voltage or current constant and within the required range.

The UC3843BD includes an oscillator that can be configured to operate in either a constant frequency, variable frequency or burst-mode mode. It also includes a slew rate control that limits the maximum rate of change of the output voltage or current.

The UC3843BD is designed to be used in a wide range of applications. It can control a range of switching frequencies from very low to very high and supports both synchronous and asynchronous operation. It provides good protection against over-voltage, under-voltage, over-current, and thermal overheating.

The UC3843BD can be used in both step-down and step-up DC-DC converter applications, making it a versatile power control device. It is suitable for switch-mode power supplies, voltage regulator modules, and other power control applications.

Conclusion

The UC3843BD is a high performance, high voltage monolithic integrated PWM controller. It has a wide range of applications, including DC motor control, lighting dimming and power converters. It is suitable for both synchronous and asynchronous operation, and provides good protection against harmful conditions such as over-voltage and under-voltage. It is an ideal device for powering relays, solenoids and stepper motors in a variety of applications.

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