UC3844DTR

Power Supply Controllers, Monitors Overview

The UC3844DTR 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 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 trim capability. It provides a high-current push-pull output capable of driving external power MOSFETs directly. Integrated protection features include under-voltage lockout, cycle-by-cycle current limiting, and thermal shutdown. The component is housed in a 14-pin SOIC package and is rated for operation over a temperature range of 0°C to 70°C.

Power Supply Controllers, Monitors Feature Summary

• Current-mode control architecture for rapid line and load transient response
• Integrated high-current push-pull output stage for direct MOSFET drive
• On-chip oscillator with frequency trim adjustment
• Comprehensive protection including under-voltage lockout and thermal shutdown

Power Supply Controllers, Monitors Applications

• Forward converters
• Flyback converters
• Push-pull converters
• Half-bridge converters

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix 'DTR' corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm that the operating environment remains within the specified commercial temperature limits of 0°C to 70°C. Ensure input voltage conditions do not violate the absolute maximum ratings defined in the official datasheet. Check for RoHS compliance status if environmental regulations apply to the final product assembly.

Power Supply Controllers, Monitors Selection Notes

Select this component when a fixed 48% maximum duty cycle is suitable for the target topology, distinguishing it from the UC3845 which offers near 100% duty cycle. Evaluate the 500 kHz switching frequency limit against electromagnetic interference requirements. Consider the 14-pin SOIC footprint constraints during PCB layout planning. Verify that the internal oscillator stability meets the precision needs of the application without external timing components.

Power Supply Controllers, Monitors Part Context

This part belongs to the UCx842-45 family of current-mode PWM controllers, widely utilized in isolated and non-isolated power supply designs. The 'UC' prefix indicates the commercial temperature grade variant. The 'D' suffix denotes the 14-pin SOIC plastic package, while 'TR' specifies the reel quantity packaging. This family shares pinouts and core functionality with other variants like UC3842 and UC3843, differing primarily in startup thresholds and duty cycle limits.

Power Supply Controllers, Monitors Replacement Considerations

Direct functional substitutes within the same family include UC3844DR (cut tape) or UC3844D (tube). Cross-manufacturer equivalents may require verification of pin compatibility and electrical parameter alignment.