UC3843AN

DC DC Switching Controllers Overview

The UC3843AN is a current-mode PWM controller manufactured by onsemi, designed for high-performance DC-DC switching applications. It operates within an input voltage range of 8.4V to 30V and features a typical start-up voltage of 8.5V with a shut-down threshold of 7.6V. The device supports a maximum switching frequency of 500 kHz, adjustable via external components. It provides a peak output drive current of ±1A, enabling direct MOSFET driving. The unit includes a 5V reference output and functions across an industrial temperature range of -40°C to +85°C.

DC DC Switching Controllers Feature Summary

• Current-mode control architecture for enhanced transient response
• Integrated oscillator with programmable frequency up to 500 kHz
• High-current push-pull output stage capable of driving power MOSFETs directly

DC DC Switching Controllers Applications

• Flyback converter designs
• Forward converter topologies
• Buck and Boost DC-DC converters

DC DC Switching Controllers Procurement Notes

Verify the specific suffix 'AN' against the manufacturer's official documentation to confirm package type and temperature grade. Ensure compatibility with required operating temperatures and pin configurations before integration into new designs.

DC DC Switching Controllers Selection Notes

Select this component when designing isolated or non-isolated power supplies requiring precise current-mode regulation. Consider the 500 kHz frequency limit and thermal performance within the specified industrial range during circuit layout and heat dissipation planning.

DC DC Switching Controllers Part Context

This part belongs to the UC384x series of current-mode PWM controllers, widely utilized in general-purpose power supply architectures. It serves as a standard solution for converting electrical energy efficiently in various electronic systems requiring regulated DC outputs.

DC DC Switching Controllers Replacement Considerations

Compatible alternatives include CW3843 and KIA3843, which are documented as functional replacements for the UC3843 series.