UC2845NG4

Power Supply Controllers, Monitors Overview

The UC2845NG4 is a current-mode PWM controller manufactured by Texas Instruments, designed for high-performance DC/DC converter applications. It operates within a supply voltage range of 10V to 36V and features an adjustable oscillator with frequency synchronization capability. The device supports multiple topologies including flyback, forward, push-pull, half-bridge, and full-bridge configurations. Key electrical specifications include a maximum switching frequency of 500 kHz, a maximum duty cycle of 50%, and a peak output drive current of 1 A. It functions reliably across an industrial temperature range from -40°C to +85°C.

Power Supply Controllers, Monitors Feature Summary

• Integrated current-mode control architecture providing inherent line feed-forward compensation and simplified loop stability.

Power Supply Controllers, Monitors Applications

• Flyback converters
• Forward converters
• Push-pull converters

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix 'G4' indicates lead-free packaging compliant with RoHS standards. Confirm the package type corresponds to the standard 16-pin PDIP format. Ensure the ordering part number matches the exact manufacturer designation to avoid compatibility issues with existing PCB footprints and assembly processes.

Power Supply Controllers, Monitors Selection Notes

Select this component when designing isolated power supplies requiring current-mode control for improved transient response. It is suitable for applications needing a maximum duty cycle limited to 50% due to its internal logic. Consider thermal management requirements as the device dissipates power during operation. Verify that the input voltage range aligns with the system's operational envelope.

Power Supply Controllers, Monitors Part Context

This part belongs to the UCx84x family of current-mode PWM controllers, which are industry-standard solutions for switch-mode power supplies. The UC2845 variant specifically offers enhanced performance characteristics compared to earlier generations, including tighter tolerances on startup thresholds and oscillator timing. It serves as a robust alternative for legacy designs requiring reliable off-line or DC-to-DC conversion.

Power Supply Controllers, Monitors Replacement Considerations

• UC2845N
• UC2845AN