UC2843AD8

UC2843AD8 is a versatile DC-DC switching controller designed with simple and reliable features. It is suitable for a variety of applications such as DC power supplies, motor control, general-purpose switching converters, and DC-DC converters. The device is available in 8-pin SOIC, SOP-8, or SSOP-8 packages and is specified over the temperature range of -40 to +125 °C.

Application Field

The UC2843AD8 is capable of driving both low-side and high-side N-channel MOSFETs with a peak output current of 1A, making it ideal for a wide variety of DC-DC converter applications. It is suitable for low-power applications such as low input voltage to high output voltage conversion and DC-DC converter topologies such as buck, boost, flyback, forward, and single-ended primary inductor converter.

The UC2843AD8 is also suitable for high power applications such as multiple output systems, forward, and ring converters. In these applications, multiple UC2843AD8 can be paralleled to increase the power capability of the system. The device is also highly suitable for applications with wide input voltages, such as automotive and telecommunication applications, where the input voltage range can range from 11V to 40V.

Working Principle

The working principle of the UC2843AD8 IC is based on a fixed frequency PWM (pulse-width modulation) control scheme. It operates in current mode, where the reference current is used to regulate the output voltage of the converter through PWM control. The duty cycle of the PWM signal is adjusted by comparing the output of the error amplifier with a triangular-wave oscillator.

The UC2843AD8 provides true over-current protection, allowing it to automatically shut down the converter when an over-current condition is detected. Secondary side over-voltage protection (OVP) is also integrated in the device and will provide protection against an over-voltage condition on the output of the converter. This can be useful in protecting connected devices such as motors from potential damage.

The UC2843AD8 provides a soft-start feature which reduces the inrush current during start-up and prevents the output of the converter from becoming over-loaded. The output can also be monitored by a built-in undervoltage lockout (UVLO) and an open-feedback loop detector.

Overall, the UC2843AD8 IC is an efficient and cost-effective IC suitable for a large range of DC-DC converter applications. It is easy to set up and use, and offers a robust performance in both automotive and telecommunication applications.