UC2845DTR

Power Supply Controllers, Monitors Overview

The UC2845DTR is a current-mode PWM controller manufactured by Texas Instruments, designed for DC-DC switching applications. It operates within an 8-SOIC package and supports multiple topologies including Boost, Buck, Flyback, and Forward converters. The device features a maximum switching frequency of 500 kHz and a maximum duty cycle of 50%. It provides a 1 A output drive capability with a typical operating supply voltage range of 10 V to 36 V. The component functions across a temperature range of -40°C to 85°C (TA) and includes internal circuitry for undervoltage lockout and precise oscillator timing.

Power Supply Controllers, Monitors Feature Summary

• Implements current-mode control architecture for rapid line transient response and inherent input voltage feed-forward capabilities.
• Integrates a precision oscillator with external timing components to set switching frequencies up to 500 kHz.
• Includes built-in undervoltage lockout with hysteresis to prevent erratic operation during power-up and brown-out conditions.
• Features high-current push-pull output drivers capable of directly driving power MOSFETs.

Power Supply Controllers, Monitors Applications

• Boost converter designs
• Flyback power supply architectures
• Forward converter implementations
• Buck/Boost dual-output systems

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm pinout compatibility and electrical specifications. Ensure the procurement channel provides valid traceability for RoHS compliance status. Confirm that the delivered package matches the required 8-SOIC form factor and lead finish. Validate that the batch corresponds to the active production lifecycle status indicated in the manufacturer's latest datasheet revision.

Power Supply Controllers, Monitors Selection Notes

Select this component when designing isolated or non-isolated converters requiring current-mode regulation. The fixed 50% maximum duty cycle limits suitability for high step-down ratios without additional compensation. Consider thermal dissipation requirements relative to the SOIC package limitations. Evaluate the 500 kHz frequency limit against electromagnetic interference constraints and transformer core losses in the target application environment.

Power Supply Controllers, Monitors Part Context

This part belongs to the UCx84x family of current-mode PWM controllers, which are industry-standard replacements for legacy models like the MC34063. The 'UC' prefix denotes commercial temperature grade operation. The 'DTR' suffix indicates surface-mount packaging in a tape-and-reel format suitable for automated assembly processes.

Power Supply Controllers, Monitors Replacement Considerations

• UC2845BD1R2G
• UC2845BD1