UC1843TD1

Power Supply Controllers, Monitors Overview

The UC1843TD1 is a current-mode PWM controller die from Texas Instruments, designed for high-performance switching power supplies. It supports Boost, Flyback, and Forward topologies with a maximum switching frequency of 500 kHz. The device features a 100% maximum duty cycle capability and provides an output drive current of 200 mA. It operates within a supply voltage range of 12 V to 18 V and draws a typical operating supply current of 25 mA. The component is rated for an extended industrial temperature range from -55°C to +125°C.

Power Supply Controllers, Monitors Feature Summary

• Current-mode control architecture for rapid transient response
• Supports multiple converter topologies including Boost, Flyback, and Forward
• Capable of 100% duty cycle operation for low dropout applications

Power Supply Controllers, Monitors Applications

• Industrial power supply designs
• Telecommunications equipment power systems
• Automotive DC/DC conversion circuits

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix and revision level against the official datasheet to ensure compatibility with existing board layouts. Confirm that the die form factor matches the intended substrate or carrier solution. Check for end-of-life status or obsolescence notices from Texas Instruments prior to finalizing procurement plans.

Power Supply Controllers, Monitors Selection Notes

Select this component when a bare die form factor is required to minimize footprint in compact power modules. Ensure the design accommodates the thermal requirements of the exposed die structure. Verify that the external circuitry meets the 500 kHz frequency stability requirements and that the 200 mA drive current is sufficient for the target gate load.

Power Supply Controllers, Monitors Part Context

This part belongs to the UC1843 family of current-mode PWM controllers. It shares functional similarities with the UC1843A-EP but differs in packaging and qualification levels. The TD1 designation indicates a specific die variant within the broader PMIC switching controller portfolio offered by Texas Instruments.

Power Supply Controllers, Monitors Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.