UC3844AD8

Power Supply Controllers, Monitors Overview

The UC3844AD8 is a high-performance fixed-frequency current-mode PWM controller designed for offline and DC-to-DC converter applications. It operates with a switching frequency of 500 kHz and supports Boost, Buck, Flyback, Forward, and Buck-Boost topologies. The device features a maximum duty cycle of 48% and provides a single output capable of 1 A drive current at 5 V. It functions within a supply voltage range of 12 V to 28 V, with a typical operating voltage of 12 V. The component is housed in a 14-pin SOIC (D) package and is rated for an industrial temperature range from 0°C to +70°C.

Power Supply Controllers, Monitors Feature Summary

• Current-mode control architecture with precise duty cycle regulation
• Integrated temperature-compensated reference voltage with undervoltage lockout
• Large current totem-pole output stage for direct MOSFET driving
• Built-in protection including latchable pulse-width modulation and per-cycle current limiting

Power Supply Controllers, Monitors Applications

• Offline flyback power supplies
• Forward converter designs
• Buck and boost DC-to-DC converters
• Battery chargers

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm pinout compatibility and electrical tolerances. Ensure the procurement channel provides valid traceability for the SOIC-14 package. Confirm that the delivered units match the specified commercial temperature grade and RoHS compliance status required by your design specifications.

Power Supply Controllers, Monitors Selection Notes

Select this component when designing isolated or non-isolated converters requiring fixed-frequency operation up to 500 kHz. It is suitable for applications needing robust current-mode control with integrated protection features. Consider the 14-pin SOIC package for surface-mount assembly requirements. Evaluate thermal management needs based on the 70°C maximum operating temperature limit.

Power Supply Controllers, Monitors Part Context

This part belongs to the UCx844 family of current-mode PWM controllers manufactured by Texas Instruments. The family includes variants such as UC1844, UC2844, and UC3844, differentiated primarily by temperature ranges and automotive qualification. The UC3844AD8 specifically targets the commercial temperature range and standard industrial reliability standards.

Power Supply Controllers, Monitors Replacement Considerations

Direct substitutes include UC3844AD8G4 and UC3844D. Verify pinout and electrical parameters before substitution.