UC3838Q

Power Supply Controllers, Monitors Overview

The UC3838Q is a high-performance power factor correction controller manufactured by Texas Instruments. It operates within a supply voltage range of 10V to 36V and supports an operating temperature range of 0°C to 70°C. The device utilizes average current mode control to achieve high power factor performance in single-phase applications. It is housed in a 20-PLCC (9x9) surface-mount package with J-leads. Key electrical characteristics include a startup current of 0.25mA, an operating supply current of 10mA, and UVLO thresholds set at 11.5V for turn-on and 9.5V for turn-off. The component is RoHS3 compliant and classified under ECCN EAR99.

Power Supply Controllers, Monitors Feature Summary

• Implements average current mode control for precise power factor correction
• Provides overvoltage protection capabilities
• Supports continuous conduction mode operation

Power Supply Controllers, Monitors Applications

• Single-phase power factor correction preregulators
• High power factor AC/DC power supplies
• Industrial power management systems

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix and revision level against the official datasheet to ensure compatibility with design requirements. Confirm that the 20-PLCC package dimensions match the PCB footprint. Check for any recent product change notices or end-of-life announcements from Texas Instruments before finalizing procurement plans.

Power Supply Controllers, Monitors Selection Notes

Select this component for designs requiring average current mode PFC control with a wide input supply range. Ensure the application environment stays within the specified 0°C to 70°C temperature limits. Verify that the 10V to 36V supply voltage range aligns with the system's power architecture and that the 20-PLCC package is suitable for the manufacturing process.

Power Supply Controllers, Monitors Part Context

The UC3838Q belongs to the UC38xx series of power management integrated circuits from Texas Instruments. This series is widely recognized for its reliability in power factor correction applications. The 'U' prefix typically denotes military-grade temperature ranges in some contexts, but the Q suffix often indicates automotive or qualified variants; however, the UC3838Q specifically is documented as a standard industrial grade part in the provided data. It serves as a core controller for improving efficiency in AC/DC conversion stages.

Power Supply Controllers, Monitors Replacement Considerations

UC2838 and UC3838 are functionally similar parts within the same family. UC3825DW offers different topology support including full-bridge and push-pull configurations.