UC3843NG4

Power Supply Controllers, Monitors Overview

The UC3843NG4 is a current-mode PWM controller designed for offline and DC-DC converter applications. It operates within a supply voltage range of 12 V to 28 V, with a minimum start-up voltage of 12 V. The device features a switching frequency up to 500 kHz and supports duty cycles up to 100%. It provides a 200 mA output drive current through a图腾柱 (totem-pole) output stage. The component is housed in an 8-pin PDIP package and functions across a temperature range of 0°C to +70°C.

Power Supply Controllers, Monitors Feature Summary

• Integrates undervoltage lockout and per-cycle current limiting for enhanced protection
• Features a high-current totem-pole output stage capable of driving power MOSFETs directly
• Supports multiple converter topologies including flyback, forward, boost, and buck configurations

Power Supply Controllers, Monitors Applications

• Offline AC-DC converters
• Forward converters
• Flyback converters
• Boost converters
• Buck converters

Power Supply Controllers, Monitors Procurement Notes

Verify the presence of the 'G4' suffix to confirm compliance with lead-free standards and RoHS directives as specified by Texas Instruments. Ensure the procurement channel sources genuine components from authorized distributors to guarantee authenticity and traceability. Cross-reference the manufacturer part number UC3843NG4 against official datasheets to validate specifications before integration into designs.

Power Supply Controllers, Monitors Selection Notes

Select this component for designs requiring robust current-mode control with integrated protection features. It is suitable for applications needing direct gate drive capability without external buffer circuits. Consider the PDIP-8 package for through-hole mounting requirements. Evaluate thermal management needs based on the 0°C to +70°C operating range and ensure input voltage stays within the 12 V to 28 V operational window.

Power Supply Controllers, Monitors Part Context

The UC3843NG4 belongs to the UC3843 series of current-mode PWM controllers manufactured by Texas Instruments. It is a lead-free, RoHS-compliant variant of the standard UC3843N. This series is widely utilized in power supply designs where reliable regulation and protection are critical. The G4 suffix indicates specific environmental compliance attributes defined by the manufacturer.

Power Supply Controllers, Monitors Replacement Considerations

UC3843N is the non-compliant equivalent. UC3843AN is the military-grade version.