UC2843NG4

Power Supply Controllers, Monitors Overview

The UC2843NG4 is a current-mode PWM controller manufactured by Texas Instruments, designed for offline and DC-DC switching power supply applications. It operates within an extended industrial temperature range of -40°C to +85°C and utilizes an 8-pin PDIP package with through-hole mounting. The device supports Boost, Flyback, and Forward topologies with a maximum switching frequency of 500 kHz. It features a 100% maximum duty cycle capability and provides a 200 mA output drive current. The operating supply voltage ranges from 12 V to 28 V, with a typical operating current of 25 mA.

Power Supply Controllers, Monitors Feature Summary

• Current-mode control architecture enabling superior input and output transient response
• Integrated adjustable oscillator allowing frequency setting via external components
• Built-in soft-start circuitry to limit inrush current during startup
• High-side driver output capable of directly driving power MOSFETs

Power Supply Controllers, Monitors Applications

• Offline AC-DC converters
• Forward converters
• Flyback power supplies
• Boost converter designs

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix 'NG4' indicates lead-free compliance and RoHS status when sourcing. Confirm the PDIP-8 package type matches your PCB footprint requirements. Ensure the supplier provides official datasheets for the UC2843 series to validate electrical characteristics against your design specifications.

Power Supply Controllers, Monitors Selection Notes

Select this component for designs requiring current-mode control with adjustable frequency up to 500 kHz. It is suitable for applications needing a robust 200 mA gate drive output. Consider the PDIP package for prototyping or high-reliability through-hole assembly needs where surface mount options are not preferred.

Power Supply Controllers, Monitors Part Context

This part belongs to the UCx84x family of current-mode PWM controllers from Texas Instruments. It shares functional similarities with the UC1843 and UC3843, differing primarily in temperature ratings and commercial/industrial classifications. The UC2843 variant specifically targets industrial environments with its wider operating temperature range compared to commercial counterparts.

Power Supply Controllers, Monitors Replacement Considerations

UC2843N

Power Supply Controllers, Monitors FAQ

What is the maximum switching frequency supported by the UC2843NG4?

The UC2843NG4 supports a maximum switching frequency of 500 kHz, which can be set using external resistor and capacitor components.

Does the UC2843NG4 include internal soft-start functionality?

Yes, the device includes a built-in soft-start feature that limits the inrush current during the startup phase of the power supply operation.