UC2845AD8TRG4

Power Supply Controllers, Monitors Overview

The UC2845AD8TRG4 is a current-mode PWM controller manufactured by Texas Instruments, designed for high-performance DC-DC switching applications. It operates within an input voltage range of 8.2 V to 25 V, with a nominal supply voltage of 15 V. The device supports switching frequencies up to 500 kHz and delivers a peak output drive current of 1 A. It features a maximum duty cycle of 50% and includes built-in adjustable oscillator timing, programmable soft-start, and latch-free operation. The component functions reliably across an industrial temperature range from -40 °C to +85 °C.

Power Supply Controllers, Monitors Feature Summary

• Current-mode control architecture provides rapid line and load transient response with inherent cycle-by-cycle current limiting.

Power Supply Controllers, Monitors Applications

• Boost converter topologies
• Flyback power supplies
• Forward converter designs

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix 'D8TRG4' against official Texas Instruments documentation to confirm package type, tape-and-reel quantity, and RoHS compliance status. Ensure the ordering part number matches the exact electrical grade and manufacturing revision required for the design. Cross-reference datasheet revisions to validate pinout and thermal characteristics before final procurement.

Power Supply Controllers, Monitors Selection Notes

Select this component for designs requiring precise current-mode regulation in single-output applications. It is suitable for systems needing a 50% maximum duty cycle limit and robust protection features. Verify that the external components support the 500 kHz switching frequency and that the PCB layout accommodates the SOIC-8 package dimensions for optimal thermal performance.

Power Supply Controllers, Monitors Part Context

This device belongs to the UCx84xA series of current-mode PWM controllers, which are industry-standard solutions for isolated and non-isolated power supplies. The UC2845 variant specifically targets applications requiring a 50% duty cycle limit, distinguishing it from other family members like the UC2843 or UC2844. It serves as a direct replacement for legacy UC1845 and UC3845 devices in many existing designs.

Power Supply Controllers, Monitors Replacement Considerations

UC2845AD8TR and UC2845D8TR are confirmed substitutes within the same manufacturer's portfolio. These alternatives share identical functional specifications and pinouts, allowing for direct integration without circuit modification.

Power Supply Controllers, Monitors FAQ

What is the maximum duty cycle limitation of the UC2845AD8TRG4?

The device has a fixed maximum duty cycle limit of 50%, making it unsuitable for applications requiring higher continuous duty cycles.

Does the UC2845AD8TRG4 include a shutdown pin?

No, the UC2845 variant does not feature a dedicated shutdown pin, unlike some other members of the UCx84x family.