UC3845D8TR

Power Supply Controllers, Monitors Overview

The UC3845D8TR is a current-mode PWM controller manufactured by Texas Instruments, designed for high-performance DC-DC switching applications. It operates within a supply voltage range of 7.6V to 30V and supports switching frequencies up to 500 kHz. The device features a maximum duty cycle of 48% and includes an on-board oscillator with programmable frequency control. It provides a single output configured as a transistor driver capable of sourcing 1A current. The component is housed in an 8-SOIC package (0.154 inch width) and is rated for an operating temperature range of -40°C to 85°C.

Power Supply Controllers, Monitors Feature Summary

• Supports multiple converter topologies including Boost, Buck, Flyback, and Forward configurations
• Integrates current-mode control architecture for precise regulation
• Features an on-board oscillator with adjustable frequency capabilities

Power Supply Controllers, Monitors Applications

• Boost converter designs
• Buck converter implementations
• Flyback power supply circuits
• Forward converter systems

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix 'D8' against the manufacturer's official documentation to confirm the tape-and-reel packaging configuration and pinout compatibility. Ensure that the 8-SOIC package dimensions align with the target PCB footprint. Confirm that the commercial temperature grade (-40°C to 85°C) meets the environmental requirements of the final assembly.

Power Supply Controllers, Monitors Selection Notes

Select this component when a current-mode controller is required for isolated or non-isolated topologies such as flyback or forward converters. The 48% maximum duty cycle limits suitability for very high step-up ratios compared to devices offering higher duty cycles. Consider the 500 kHz switching frequency capability for balancing efficiency and component size in the magnetic design phase.

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 other members like the UC2845 and UC3845, differing primarily in package type and manufacturing revision. The 'D8' suffix specifically denotes the surface-mount 8-SOIC variant supplied in tape-and-reel format for automated assembly processes.

Power Supply Controllers, Monitors Replacement Considerations

• UC3845DTR
• UC3845AD8TR

Power Supply Controllers, Monitors FAQ

What is the maximum duty cycle limitation of the UC3845D8TR?

The device has a maximum duty cycle limit of 48%, which restricts its use in applications requiring higher continuous duty cycles.

Does the UC3845D8TR support clock synchronization?

No, the UC3845D8TR does not feature a clock synchronization input; it relies on its internal on-board oscillator for timing.