UC3843ANG4

Power Supply Controllers, Monitors Overview

The UC3843ANG4 is a current-mode PWM controller from Texas Instruments designed for offline and DC-DC converters. It operates within a supply voltage range of 12 V to 28 V with a startup threshold typically around 16 V. The device features a fixed switching frequency of 500 kHz and supports duty cycles up to 100%. It includes integrated undervoltage lockout, a precision oscillator, and a high-current图腾柱 output capable of sourcing and sinking significant peak currents. The component is housed in an 8-pin PDIP package suitable for through-hole mounting.

Power Supply Controllers, Monitors Feature Summary

• Integrates undervoltage lockout with hysteresis to prevent sub-cycle operation during power-up.
• Features a high-current图腾柱 output stage for direct drive of power MOSFETs.
• Includes a precision oscillator and programmable current sensing input for cycle-by-cycle limiting.

Power Supply Controllers, Monitors Applications

• Offline flyback converter designs
• Forward converter topologies
• Buck and boost DC-DC converter circuits

Power Supply Controllers, Monitors Procurement Notes

Verify the suffix 'G4' indicates compliance with specific environmental standards as defined by the manufacturer. Confirm that the PDIP-8 package matches the target PCB footprint requirements. Ensure the supplier provides valid traceability documentation for the Texas Instruments manufacturing origin.

Power Supply Controllers, Monitors Selection Notes

Select this component when a robust current-mode control strategy is required for isolated or non-isolated power supplies. The 500 kHz fixed frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the 200 mA output capability for driving medium-power switches without external drivers.

Power Supply Controllers, Monitors Part Context

This part belongs to the UCx84x series of current-mode PWM controllers. It shares functional similarities with the UC3842 but offers enhanced performance characteristics such as higher output drive current and improved thermal stability. The series is widely used in general-purpose power supply applications requiring reliable regulation.

Power Supply Controllers, Monitors Replacement Considerations

The UC3843AN is a compatible alternative within the same product family. Verify pin compatibility and electrical parameter alignment before substitution. Other members of the UCx84x series may require circuit adjustments due to differences in operating thresholds.