UC2843DG4

Power Supply Controllers, Monitors Overview

The UC2843DG4 is a current-mode PWM controller from the UCx84x series, manufactured by Texas Instruments. It supports Boost, Flyback, and Forward topologies with a fixed switching frequency of 500 kHz. The device features a maximum duty cycle of 100% and includes an internal 5 V output reference. It provides a peak output drive current of 200 mA and operates within a temperature range of -40°C to +85°C. Packaged in an SOIC-8 surface-mount format, it utilizes current-mode control for enhanced transient response.

Power Supply Controllers, Monitors Feature Summary

• Current-mode PWM control architecture with automatic feed-forward compensation
• Integrated high-precision 5 V bandgap reference source
• Dedicated UVLO circuit with distinct start and stop thresholds
• Totem-pole output stage designed for direct MOSFET driving

Power Supply Controllers, Monitors Applications

• Offline flyback power supplies
• Forward converter designs
• Boost DC-to-DC converters
• Battery charger circuits

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix against official documentation to confirm package type and temperature grade. Confirm RoHS compliance status through the manufacturer's latest datasheet revision. Check component availability as lifecycle status may vary. Ensure ordering details match the required pinout and thermal specifications for the target application.

Power Supply Controllers, Monitors Selection Notes

Select this component when a 100% maximum duty cycle is required for boost or flyback applications. Choose over variants with lower duty limits if continuous on-time operation is necessary. Consider the SOIC-8 package for space-constrained surface-mount layouts. Verify that the 500 kHz fixed frequency aligns with the system's EMI and efficiency targets.

Power Supply Controllers, Monitors Part Context

This part belongs to the UCx84x family of current-mode PWM controllers. It shares functional similarities with UC2842, UC2844, and UC3843 but differs in specific electrical parameters such as duty cycle limits and operating temperature ranges. The DG4 suffix indicates a lead-free and RoHS-compliant variant of the standard UC2843 device.

Power Supply Controllers, Monitors Replacement Considerations

• UC2843ADTR
• UC2843BDR2G

Power Supply Controllers, Monitors FAQ

What is the maximum duty cycle capability of the UC2843DG4?

The UC2843DG4 supports a maximum duty cycle of 100%, making it suitable for applications requiring continuous on-time.

How does the UC2843DG4 handle startup voltage?

It features a unique UVLO circuit where the start threshold is higher than the stop threshold, preventing repeated startup/shutdown cycles during brown-out conditions.